Academic literature on the topic 'Fruit thinning'
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Journal articles on the topic "Fruit thinning"
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Septiriyani, Lusiana, Mohammad Chozin, and Yulian Yulian. "PERTUMBUHAN DAN HASIL BLEWAH (Cucumis melo var. cantalupensis L.) PADA TINGKAT PENJARANGAN BUAH DAN DOSIS PUPUK NPK BERBEDA." Jurnal Ilmu-Ilmu Pertanian Indonesia 23, no. 2 (December 24, 2021): 72–77. http://dx.doi.org/10.31186/jipi.23.2.72-77.
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[PRODUCTIVITY AND FRUIT QUALITY OF CANTALOUPE AT DIFFERENT RATES OF FRUIT THINNING AND NPK FERTILIZER APPLICATION]. Productivity and fruit quality of cantaloupe depend on the availability of nutrients and the number of fruits maintained. The aim of this study was to compare the productivity and fruit quality of cantaloupe at different rates of fruit thinning and NPK fertilizer application. The research was conducted in August-October 2020 on street Kapuas V, Lingkar Barat Village, Gading Cempaka District, Bengkulu city. A field experiment was arranged in a randomized complete block design (RCBD) with 3 replications for alloting two factorial treatments structure, namely rates of fruit thinning (no fruit thinning, thinned to one fruit /plant, thinned to two fruits/plant, and thinned to three fruits/plant) and rates of NPK fertilizer application (400, 600, and 800 kg/ha) on rhe experimental plots. The results showed that fruit thinnings resulted no increament in crop productivity, but the fruit quality was improved as fewer number of fruits were retained on each plant. The NPK fertilizer at 400, 600, and 800 kg/ha were not able to increase the productivity of cantaloupe and the quality of the produced fruit when the application were made only at planting and 23 days after planting.
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Mohamed Arba and Siham Farhat. "Effects of fruit thinning and some fruit and cladode components on fruit growth and fruit weight of cactus pear Opuntia ficus-indica (L.) Mill." International Journal of Frontiers in Science and Technology Research 3, no. 1 (July 30, 2022): 027–37. http://dx.doi.org/10.53294/ijfstr.2022.3.1.0041.
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The aim of this paper is to study the effect of fruit thinning and some fruit and cladode components on fruit growth and weight of cactus pear Opuntia ficus-indica (L.) Mill. The relationships between the fruit fresh weight and each of the parameters number of fruits per cladode, surface of cladodes and the dry weight of cladodes are studied. Experiments were carried out on an adult plantation of cactus pear in the Agadir area. Fruit thinning treatments used were: T: control without thinning, T1: thinning treatment of 6 fruits per cladode and T2: thinning treatment of 12 fruits per cladode. The size of cladodes used are: the small cladodes (C1), the medium cladodes (C2) and the large cladodes (C3). Obtained results showed that fruit thinning and the surface of cladodes and the interaction of the two factors have a significant effect (p ≤ 0.001) on fruit growth. On May 10, 2019, the highest rate of growth was obtained with the combination T1/C3 (thinning treatment T1 and large cladodes C3), with 1.6 cm for fruit length and 1 cm for fruit diameter, and the lowest rate of growth was obtained with the combination C1/T (not thinned plants and small cladodes C1) with 0.5 cm for fruit length and 0.3 cm for fruit diameter. The ratio dry weight of cladodes/ number of fruits per cladode has a significant effect (p ≤ 0.001) on the fruit fresh weight. The increase in the dry weight of cladodes and the reduction in the number of fruits per cladode leads to the production of fruits with large size. Positive linear relationships exist between the fruit fresh weight and the ratio dry weight of cladodes/ number of fruits per cladode, between the fruit fresh weight and the number of fruits per cladode, and between the fruit fresh weight and the surface of cladodes and the coefficient of determination R2 for each linear relationship is close to 1.
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Zaaroor-Presman, Merav, Sharon Alkalai-Tuvia, Daniel Chalupowicz, Marina Beniches, Abraham Gamliel, and Elazar Fallik. "Watermelon Rootstock/Scion Relationships and the Effects of Fruit-Thinning and Stem-Pruning on Yield and Postharvest Fruit Quality." Agriculture 10, no. 9 (August 19, 2020): 366. http://dx.doi.org/10.3390/agriculture10090366.
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This study examined the effects of stem-pruning and fruit-thinning on the yield of marketable watermelon fruit (>5 kg) and watermelon quality after four days of postharvest storage at 22 °C (marketing simulation). We examined the fruits from non-grafted and grafted plants (TZ and Nurit rootstocks) for two consecutive years. Grafting increased the number of marketable fruit per m2. The weight of the average marketable fruit was increased by pruning, but was not affected by thinning or by the choice of rootstock. The level of total soluble solids was higher among fruits from Nurit rootstock. Flesh texture was improved by grafting, but was not affected by thinning or pruning. Thinning improved the taste of the fruit significantly better than stem-pruning did. Grafting (both rootstocks) was associated with crispier fruits. The fruits from Nurit-grafted plants tasted best. The combination of grafting + fruit-thinning increased the fruit lycopene content. The highest levels of vitamin C were found among the fruit from Nurit-grafted plants and the pruned + Nurit-grafted plants, in particular. Overall, fruit quality was affected mainly by grafting onto Nurit rootstock in combination with fruit-thinning and less by stem-pruning. However, not all internal and nutritional quality parameters were significantly affected by the grafting + fruit-thinning treatment.
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Oliveira, Paula Duarte de, Gilmar Arduino Bettio Marodin, Gustavo Klamer de Almeida, Mateus Pereira Gonzatto, and Daniel Chamorro Darde. "Heading of shoots and hand thinning of flowers and fruits on 'BRS Kampai' peach trees." Pesquisa Agropecuária Brasileira 52, no. 11 (November 2017): 1006–16. http://dx.doi.org/10.1590/s0100-204x2017001100006.
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Abstract: The objective of this work was to evaluate the effect of shoot heading and of hand thinning in different development stages of flowers and fruits on the fruit production and quality of 'BRS Kampai' peach (Prunus persica) trees. The experiment was performed during three crop years, under the conditions of the “Depressão Central” region in the state of Rio Grande do Sul, Brazil, and the treatments were: T1, heading of half of the mixed shoot; T2, heading of one third of the mixed shoot; T3, flower thinning in the pink bud stage; T4, thinning at full bloom; T5, thinning of fruit with 5 mm; T6, thinning of fruit with 20 mm; and T7, no thinning or heading (control). Fruit production and quality were evaluated. Plants with no thinning were more productive, but showed high frequency of fruits with a diameter smaller than 60 mm. Shoot heading reduced production per tree and resulted in small-sized fruit. Thinning time did not affect production, and fruit size was greater when thinning was performed at the bloom stage. 'BRS Kampai' peach trees can be thinned starting at bloom, which provides greater fruit size, with no production loss.
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YESHITELA, T., P. J. ROBBERTSE, and J. FIVAS. "EFFECTS OF FRUIT THINNING ON ‘SENSATION’ MANGO (MANGIFERA INDICA) TREES WITH RESPECT TO FRUIT QUANTITY, QUALITY AND TREE PHENOLOGY." Experimental Agriculture 40, no. 4 (October 2004): 433–44. http://dx.doi.org/10.1017/s0014479704002091.
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Different fruit thinning methods were tested on ‘Sensation’ mango trees over two seasons in a trial conducted in Northern Province, South Africa. The objective of the study was to select the best thinning intensity and method based on different parameters. Thinning was carried out in October prior to the occurrence of excessive natural fruit drop. When fruits were thinned to one and two fruits per panicle, fruit number, weight and yield per tree at harvest were all increased. When 50% of the panicles were thinned there was an increase in the fruit retention potential of the trees as well as in the size and quality of the fruit produced. Large fruits were, however, prone to certain physiological problems. Chemical thinning with Corasil.E produced very small fruits with an increased percentage of ‘mules’ (fruit without seed). Trees subjected to severe thinning intensities showed earlier recovery of starch reserves and better vegetative growth than the control.
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Lahav, E., A. Korkin, and G. Adar. "Thinning Stage Influences Fruit Size and Yield of Kiwifruit." HortScience 24, no. 3 (June 1989): 438–40. http://dx.doi.org/10.21273/hortsci.24.3.438.
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Abstract An experiment in thinning kiwifruit (Actinidia deliciosa Planch.) vines at the bud swell stage vs. at fruit set stage was conducted in the Western Galilee to a) determine the optimal physiological stage of thinning, b) optimize fruit weight and yield, and c) determine the relationship between fruit number per vine and alternate bearing. A negative relationship was found between the number of fruits per vine and fruit weight or alternate bearing. Vines thinned at the bud swell stage always carried larger fruits than those thinned after fruit setting. As the fruit load on the vine decreased, smaller differences were observed between the two thinning dates. Assuming that individual fruit weight should not be < 70 g, thinning at the bud swell stage allows a yield of 1700 fruits per vine, and that at the fruit-set stage only 1400 fruits per vine. Vines not sprayed with Alzodef (H2CN2, cyanamide) to break dormancy yielded less than half the number of fruits as the sprayed vines.
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Angami, Thejangulie, H. Kalita, Anup Chandra, Jitendra Kumar, Badapmain Makdoh, K. Suraj Singh, and Letngam Touthang. "Augmenting the production and quality of Kiwifruit var. Allison through manual thinning and pruning." emergent Life Sciences Research 08, no. 02 (2022): 150–55. http://dx.doi.org/10.31783/elsr.2022.82150155.
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On well pollinated seven years old kiwifruit vines var. Allison, different hand thinning severities of fruitlets were executed under the Sub-tropical mid hill conditions. Among the different hand thinning treatments, thinning to retain two fruits and four fruits per fruiting shoot with regular winter pruning exhibited significantly higher fruit size of length (7.21 ± 0.02 cm, 7.13 ± 0.11 cm), breadth (5.35 ± 0.06 cm, 5.24 ± 0.09 cm) and average fruit weight (83.69 ± 1.44 g, 82.37 ± 0.53 cm). The fruit number per vine and total yield declined with an increase in the severity of thinning, whereas the control treatment (no thinning and pruning) exhibited the highest fruit number per vine (457.65 ± 1.09) and total yield (31.94 ± 1.47 kg). Though the maximum production was observed in control yet the yield of grade ‘A’ fruit was the least (8.88 ± 0.91 kg) resulting in the lowest net profit (Rs. 1240 per vine). Manual thinning by retaining six fruits per fruiting shoot yielded optimum thinning and the highest production of ‘A’ grade fruits (23.48 ± 2.62 kg) with the highest net profit (Rs. 2290 per vine) over other treatments. The experiment also vividly revealed that TSS, sugars, ascorbic acid content as well as pigments viz. likes total chlorophyll and carotenoids of fruits increased as the intensity of thinning was augmented.
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Wociór, Stanisław. "Influence of hand thinning of flowers and fruits on yielding and fruit quality of apples cultivar Szampion." Acta Agrobotanica 61, no. 2 (2012): 141–46. http://dx.doi.org/10.5586/aa.2008.042.
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The thinning of flowers and fruit sets did not change the strength of tree growth in a signifi cant way. Szampion cv. trees on rootstock A 2 grew better than on M.7. The trees of Szampion RENO cv. grew significantly worst. The thinning of flowers and fruit sets decreased the yield from a tree and the total yield from 1 ha of the studied biological material. Flower thinning slightly increased the mean commercial yield as compared to the control trees. Thinning of 50% of flowers at the stage of the pink bud and sets after the June fall decreased the number of fruits on the trees of Szampion cv. grafted on M.7. It was only in 2004 that the flower thinning treatment significantly increased the fruit weight. Flower thinning increased the percentage of fruits with a diameter of over 7 cm in the case of Szampion cv. trees grafted on M.7. This treatment considerably (in 2006 significantly) improved fruit colouring. A positive reaction to flower thinning was also observed in Szampion RENO trees. In the case of Szampion cv., which shows a tendency to excessive fruit setting and small fruits, it is better to apply flower thinning eliminating the excess of sets in the period of cell division in growing fruits than do it later, after the June fall. The inflorescence removal treatment requires much more time than thinning of fruit sets.
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Mohamed Arba and Siham Farhat. "Effect of fruit thinning on fruit yield and quality of cactus pear Opuntia ficus-indica (L.) Mill. in a semi-arid area." International Journal of Science and Research Archive 6, no. 1 (June 30, 2022): 234–43. http://dx.doi.org/10.30574/ijsra.2022.6.1.0122.
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The aim of this work was to study the effect of fruit thinning on fruit yield and quality of cactus pear. To meet this objective, trials on fruit thinning were conducted on an adult plantation of cactus pear in a semi-arid region in southern Morocco. The fruit thinning consisted of reducing the fruit load of overcharged cladodes by reducing the number of fruits to 6 or 12 per cladode. It was practiced in early May on three types of one-year old cladodes (small cladodes, the medium ones and large cladodes), by removing some floral buds or young fruits at the flowering stage. The control cladodes had an average number of 18 fruits per cladode. Obtained results showed that the reduction in the load of cladodes improved fruit size and quality. In thinned plants to 6 fruits per cladode and for the three types of cladodes, average fruit weight was 160.44 g and average fruit length and diameter was 8.64 and 6.38 cm respectively. While in not thinned plants and for the three types of cladodes, average fruit weight was only 74.53 g and average fruit length and diameter was 6.40 and 4.46 cm respectively. Fruit thinning increased the content of sugar in the fruits and decreased the number of seeds in the fruits and the fruit peel thickness, but did not affect the juice content in the fruits and the pH and titratable acidity of the juice. Fruit thinning also improved the economic income of the yield and the gain in the yield of thinned plants to 6 fruits per cladode was 33912 DH per hectare compared to not thinned plants.
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PERES, LUDMILLA DE LIMA CAVALLARI, ANTONIO BALDO GERALDO MARTINS, LÍVIA FELÍCIO BARRETO, and ULIANA VIEIRA PIMENTEL. "EFFECT OF FRUIT THINNING INTENSITY ON FIVE VARIETIES OF LYCHEE." Revista Caatinga 30, no. 4 (December 2017): 1079–86. http://dx.doi.org/10.1590/1983-21252017v30n430rc.
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ABSTRACT Fruit thinning is the removal of fruitlets in heavy fruit set situations and aims to increase salable fruit sizes, avoid branch breakdown, reduce harvesting costs, and promote a balance between the vegetative and reproductive growth of plants. Furthermore, this procedure may improve coloring, increase soluble solids, and maintain plant vigor. This study aimed to evaluate the effects of fruit thinning in five varieties of lychee (Bengal, American, Mauritius, Sweet Cliff, and WB4), in the conditions of Jaboticabal - São Paulo state (Brazil). The experimental design was a completely randomized design (CRD) with five treatments and seven replications of three plants each. Treatments consisted of fruit thinning intensities characterized by the number of fruit left on terminal branch panicles, being T1: 3 fruits/branch; T2: 6 fruits /branch; T3: 9 fruit/ branch; T4: 12 fruits/branch; T5: no thinning (control plot). Evaluations were made through a colorimetric assay on ripe fruits, besides a physical and chemical analysis for each variety. The treatments affected the response of varieties on each studied variable. The variety “Mauritius” showed interesting physical and chemical characteristics for the consumer market.
Dissertations / Theses on the topic "Fruit thinning"
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Kirstein, Deon Louw. "Mechanical thinning of pome fruit." Thesis, Stellenbosch : Stellenbosch University, 2015. http://hdl.handle.net/10019.1/97920.
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Thesis (MSc)--Stellenbosch University, 2015.ENGLISH ABSTRACT: Thinning is an important practice in pome fruit production which aims to ensure an optimal yield of high quality, large sized fruit as well as an adequate return bloom. In South Africa, pome fruit thinning is generally done by means of chemicals, with follow-up hand thinning. When thinning is effective, set and thus the hand thinning requirement should be reduced. This is important as labor cost associated with hand thinning is high and continually rising. Chemical thinning is weather dependent and can be environmentally harmful, which has led to a shift towards environmentally acceptable methods of thinning such as mechanical thinning. From 2013 until 2015 the mechanical string thinners, viz. Darwin 300™, BAUM, and Bloom Bandit™, were evaluated. These machines are used to thin trees during full bloom and reduce the number of flowers before fruit set. The aim of the trials was to reduce fruit set and therefore hand thinning requirement, while increasing fruit size and quality, maintaining yield and return bloom. A range of tractor speeds and rotational rates were evaluated with the Darwin 300™ on ‘Forelle’ pears and ‘Cripps’ Pink’ apples, while the BAUM was evaluated only on ‘Cripps’ Pink’ apples. The hand-held Bloom Bandit™ was evaluated on ‘Forelle’, ‘Cripps’ Pink’, ‘Fuji’ and ‘Cripps’ Red’. The tractor-driven mechanical thinning devices gave erratic results. The most consistent results on ‘Forelle’ were obtained using the Darwin 300™ at 5.2 km·h-1 and 300 rpm, while the BAUM gave no consistent results. The unreliability of results were due to South African pome fruit orchards currently being unsuitable for tractor-driven mechanical thinning machines. The ‘Forelle’ orchard trained to a Palmette system was the most suited for thinning, which is reflected in the more positive results obtained, but further improvements are possible. The Bloom Bandit™ effectively thinned pear and apple trees and increased fruit size without a decrease in yield or return bloom. More time is spent on thinning with the device compared to tractor-driven machines and this should be taken into account when considering using the Bloom Bandit™. Thinning intensities of 25%, 50% and 75% of clusters or flowers was applied to mature ‘Forelle’ and ‘Cripps’ Red’ trees during full bloom. Variable effects were seen on fruit set, yield was reduced to acceptable levels, while fruit size was improved in ‘Forelle’ but not ‘Cripps’ Red’. Results showed that when thinning mechanically, the aim should be to remove between 25% and 50% of flowers clusters in ‘Forelle’ and 50% of flowers clusters in ‘Cripps’ Red’. These levels of thinning gave the best results in terms of the remaining hand thinning requirements and improved return bloom in ‘Forelle’. We, however, only evaluated full cluster thinning and not within cluster thinning, which might also occur during mechanical thinning.
AFRIKAANSE OPSOMMING: Vruguitdunning is 'n belangrike praktyk in kernvrugproduksie en het ten doel om voldoende opbrengs van hoë kwaliteit, groot vrugte en voldoende opvolgblom te lewer. In Suid-Afrika, word kernvrugte gewoonlik chemies uitgedun, opgevolg met handuitdunning. Effektiewe uitdunning verminder set en dus die benodigde handuitdunning. Dit is belangrik aangesien die arbeidskoste verbonde aan die handuitdunning hoog is en voortdurend styg. Chemiese uitdunning is afhanklik van weerstoestande en dit kan ook omgewing-onvriendelik wees. Hierdie nadele het gelei tot 'n verskuiwing na omgewingsaanvaarbare metodes van uitdunning soos meganiese uitdun. Vanaf 2013 tot 2015 is die meganiese Darwin 300™, BAUM en Bloom Bandit™ uitdunmasjiene geëvalueer. Hierdie masjiene word gedurende volblom gebruik om blomme uit te dun en verminder die aantal blomme voor vrugset. Die doel van die proewe was om vrugset en dus die handuitdunvereiste te verminder met ‘n gepaardgaande verbetering in vruggrootte en kwaliteit sonder om opbrengs en opvolgblom nadelig te beïnvloed. Trekker en rotasiespoed is gevarieer met die Darwin 300 ™ op 'Forelle' pere en ‘Cripps’ Pink' appels, terwyl die BAUM net op 'Cripps' Pink' appels geëvalueer is. Daarbenewens was die hand-draagbare Bloom Bandit™ geëvalueer op 'Forelle', 'Cripps' Pink’, ‘Fuji’ en ‘Cripps' Red’. Die trekkergedrewe uitdunmasjiene het wisselvallige resultate opgelewer. Die mees konstante resultate op 'Forelle' is verkry met die Darwin 300™ teen 5.2 km·h-1 en 300 rpm, terwyl die BAUM nie konsekwente resultate gegee het nie. Die wisselvallige resultate van die Darwin 300™ en die BAUM is te wyte aan die boorde wat nie vir trekkergedrewe uidunmasjiene geskik is nie. Die 'Forelle’ boord, wat as 'n Palmette stelsel opgelei is, was die meeste geskik vir uitdunning, soos duidelik uit die positiewe resultate wat verkry is, maar verdere verbeterings is steeds moontlik. Die Bloom Bandit™ het peer en appel bome effektief uitgedun deur die handuitdunvereiste te verminder en vruggrootte te verbeter sonder verlies in opbrengs of opvolgblom. Meer tyd word gespandeer tydens uitdunning met hierdie toestel in vergelyking met trekkergedrewe masjiene, en dit moet in ag geneem word met oorweging van die Bloom Bandit™. Uitdunningsintensiteite van 25%, 50% en 75% van die trosse of blomme is tydens volblom toegepas op volwasse 'Forelle’ en ‘Cripps’ Red' bome. Vrugset het aansienlike variasie getoon terwyl opbrengs tot aanvaarbare vlakke verminder en vruggrootte verbeter is in 'Forelle' maar nie in 'Cripps' Red’ nie. Resultate het getoon dat die doel moet wees om tussen 25% en 50% van alle blomme in trosse in 'Forelle’ en 50% van blomme in trosse in 'Cripps’ Red’ tydens meganiese uitdunnig te verwyder. Hierdie vlakke van uitdunning het die beste resultate gegee ten opsigte van die oorblywende handuitdunvereistes en het opvolgblom in 'Forelle’ verbeter. Ons het egter net volledige trosse uitdunning gedoen en nie blomuitdunning binne die tros wat ook tydens meganiese uitdun kan plaasvind nie.
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Steenkamp, Human. "New chemical thinning strategies for stone fruit." Thesis, Stellenbosch : Stellenbosch University, 2015. http://hdl.handle.net/10019.1/98026.
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Thesis (MSc)--Stellenbosch University, 2015.ENGLISH ABSTRACT: Thinning of stone fruit, just as in any other deciduous fruit crop, plays an important role in producing fruit of the right size and quality. Hand thinning is highly labor intensive and time consuming, thus an alternative method of thinning is important to the industry. Chemical and mechanical thinning either alone or in combination could be the alternative. Two chemicals, 1-aminocyclopropane-1-carboxylic acid (ACC) and 6-benzyladenine (6-BA) were evaluated on Japanese plums, cling peaches and nectarines. In addition, the Darwin 300™, a mechanical string thinner, was also included in trials on early maturing ‘Alpine’ nectarine and ‘African Rose™’ plum. In all trials the objective was to reduce the required hand thinning during commercial hand thinning without compromising on yield and fruit quality. In Japanese plums we were able to reduce the hand thinning requirement significantly with both the ACC thinning and mechanical thinning strategies. Regarding ACC, cultivars differed in their sensitivity to the chemical and the recommended rate will differ for cultivars. ACC consistently reduced the required hand thinning linearly with increasing rate. The recommended rate of ACC for ‘African Rose™’ is 600 μl.L-1 and for ‘Laetitia’ 400 μl.L-1. For ‘Fortune’ a recommended rate could not be determined at this stage, thus further trials should be conducted. The Darwin 300™ reduced hand thinning significantly without reducing the yield significantly. Combining the Darwin 300™ with ACC 600 μl.L-1 in ‘African Rose™’ gave promising results with regard to hand thinning requirement and fruit size, without reducing yield efficiency significantly. No leaf drop was observed on Japanese plums, except in the pilot trial when applications were made at high temperatures, which should therefore be avoided. ACC was effective as thinning agent in cling peaches. In ‘Keisie’, the results were positive during both seasons, and ACC reduced the hand thinning requirement without reducing yield efficiency. The recommended rate of ACC for ‘Keisie’ is 600 μl.L-1. Slight leaf drop was observed. In ‘Sandvliet’, there was a significant reduction in fruit set, without reducing the required hand thinning. The reduction in fruit set led to a significant reduction in yield. Severe leaf drop was observed, indicating that cultivars differ in sensitivity to ACC. ACC would not currently be recommended for ‘Sandvliet’. In nectarines, ACC only thinned ‘Turquoise’ but not ‘Alpine’ or ‘August Red’ at the rates and phenological stage used, again indicating cultivar differences in sensitivity. In ‘Turquoise’, the highest ACC rate (500 μl.L-1) reduced fruit set per tagged shoot, as well as the hand thinning requirement, but this rate also reduced the total yield. The Darwin 300™ evaluated on ‘Alpine’ reduced fruit set significantly and the hand thinning requirement without reducing yield efficiency, indicating that mechanical thinning is a viable option in nectarines. Slight leaf drop was observed in all nectarine trials and ACC would not currently be recommended for nectarines. 6-BA was included to combat ACC-induced leaf drop and was partially successful. The reason for the differences observed in response to ACC between cling peaches and plums on the one hand, and nectarines on the other, cannot currently be explained.
AFRIKAANSE OPSOMMING: Uitdun van steenvrugte, net soos vir enige ander sagtevrugte soort, speel 'n belangrike rol in die produksie van vrugte met die regte grootte en gehalte. Uitdun van steenvrugte is hoogs arbeidsintensief en tydrowend, dus is dit belangrik om ʼn alternatief te vind vir die bedryf. Chemiese of meganiese uitdunning alleen of in kombinasie kan die alternatiewe wees. Twee middels, 1-aminosiklopropaan-1-karboksielsuur (ACC) en 6-bensieladenien (6-BA) is geëvalueer op Japanese pruime, taaipitperskes en nektariens. Daarby is die Darwin 300™, ʼn meganiese uitdunmasjien, ingesluit vir twee vroeë kultivars, nl. Alpine nektarien en African Rose™ pruim. Die doel van die proewe was om handuitdunning tydens kommersiële handuitdun te verminder, sonder om die opbrengs en vrugkwaliteit negatief te beïnvloed. Vir Japanese pruime kon ons die nodige handuitdunning beduidend verminder met beide die ACC en meganiese uitdun strategieë. Daar was wel ʼn verskil tussen die kultivars se sensitiwiteit teenoor ACC en die aanbevole konsentrasie sal verskil tussen kultivars. ACC het die benodigde handuitdunning vir al drie kultivars lineêr verminder met ʼn toename in konsentrasie. Die aanbevole konsentrasie van ACC vir ‘African Rose ™’ is 600 μl.L-1 en vir ‘Laetitia’ 400 μl.L-1. Vir ‘Fortune’ kan daar nog nie op hierdie stadium 'n konsentrasie aanbeveling gemaak word nie. Die Darwin 300™ behandeling het die benodigde handuitdunning beduidend verminder sonder om die opbrengs te beïnvloed. Die kombinasie van die Darwin 300 ™ met ACC 600 μl.L-1 het ook goeie resultate opgelewer wat handuitdunning en vruggrootte aanbetref sonder om die opbrengsdoeltreffendheid te verlaag. Geen blaarval was opgemerk by die pruime nie, behalwe in ʼn voorlopige proef toe die ACC toegedien is by hoë temperature, wat dus vermy moet word. Die effektiwiteit van ACC as uitdunmiddel van taaipitperskes was belowend. Vir ‘Keisie’ was die resultate positief vir beide seisoene, en ACC het handuitdunning verminder sonder om die opbrengs te beïnvloed. Die aanbevole ACC konsentrasie vir ‘Keisie’ is 600 μl.L-1. Effense blaarval is wel waargeneem. Vir ‘Sandvliet’ was daar 'n beduidende vermindering in vrugset, sonder dat handuitdunning verminder is. Daar was ook 'n beduidende afname in opbrengs en erge blaarval in die proef waargeneem. ACC sal tans nie aanbeveel word vir 'Sandvliet’ nie. Met nektariens het ACC net ‘n uitduneffek op ‘Turquoise’ getoon, maar nie teen die aangewende dosisse en ontwikkelingstadium op ‘Alpine’ of ‘Augustus Red’ nie. Dit dui daarop dat ACC kultivarspesifiek mag wees. In ‘Turquoise’ het die hoogste konsentrasie (500 μl.L-1) vrugset van gemerkte lote en die handuitdunning verminder, maar ook die totale opbrengs. Die Darwin 300 ™ het die vrugset van ‘Alpine’ asook die benodigde handuitdunning aansienlik verminder sonder om die opbrengs te verlaag. Effense blaarval was opgemerk in alle nektarien proewe. ACC sal nie aanbeveel word as uitdunmiddel vir nektariens nie. 6-BA was in die studie ingesluit om ACC-geïnduseerde blaarval teen te werk en was slegs gedeeltelik suksesvol. Die rede vir die verskille in respons tot ACC tussen pruime, perskes en nektariens kan nie tans verklaar word nie.
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De, Villiers Michiel Hendrik Jacobus. "Mechanical and chemical thinning of stone fruit." Thesis, Stellenbosch : Stellenbosch University, 2014. http://hdl.handle.net/10019.1/95809.
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Thesis (MScAgric)--Stellenbosch University, 2014.ENGLISH ABSTRACT: Producing fruit of the appropriate size and high quality is of the upmost importance to realize a profit in the fruit industry. This can be achieved through bloom or fruitlet thinning to reduce the number of fruit left on the tree. The cost of production is rising and labour cost forms a large part of the total production cost. Thinning of stone fruit is labour intensive and expensive, so an alternative to hand thinning needs to be found. Two alternatives are chemical and mechanical thinning. Chemical thinners are not routinely used in stone fruit as it is in pome fruit production and gibberellins were evaluated in this study. The Darwin 300TM was evaluated as a mechanical alternative to hand thinning. It thins flowers during bloom, before fruitlet thinning by hand is performed. In our trials on nectarines and Japanese plums the objective of reducing the time required for hand thinning was achieved, with the Darwin 300TM reducing the time required by up to 50%. When the time required to thin was reduced too much it also reduced the yield, but this could be overcome by lowering the rotor speed or using different strategies during supplementary hand thinning at the fruitlet stage. The bloom thinning and reduction in yield led to an increase in the fruit size. Care should be taken when using the Darwin 300TM as the earlier thinning could increase pit splitting and/or fruit cracking, especially in cultivars that are sensitive to these defects. The optimal rate of thinning needs to be determined for each cultivar individually. The application of gibberellic acid (GA3) and gibberellin A4+7 (GA4+7) at the pit hardening stage in the previous season could decrease the number of flowers for the following growing season. There was no effect on the yield at harvest or fruit size in the season of GA3 and GA4+7 applications, but the fruit firmness was increased. This effect was more pronounced for the GA4+7 applications. Our objective of reducing the time required for thinning was achieved in some but not all cultivars. The yield was not significantly reduced, with the fruit maturity only delayed in ‘African Rose’ plum. Again no increase in fruit size was found, but the fruit firmness was again increased. The GA-applications therefore were not satisfactory in their reduction of the time required for hand thinning. A positive effect is the increase in fruit firmness, which could possibly increase the storage potential of the fruit without having negative effects on the other aspects of fruit quality but this needs further evaluation.
AFRIKAANSE OPSOMMING: Produksie van vrugte met die verlangde vruggrootte en hoë vrug kwaliteit is baie belangrik vir die realisering van ‘n wins in die vrugte-industrie. Met hierdie mikpunt in gedagte, is blom- en vruguitdunning baie belangrik om die aantal vrugte per boom te verminder. Die kostes geassosieer met vrugte produksie is besig om te styg en arbeidskoste vorm ‘n groot deel van die totale produksiekostes. Uitdunning van steenvrugte is arbeidsintensief en baie duur, dus moet ‘n alternatief vir handuitdunning gevind word. Daar is twee alternatiewe naamlik chemiese en meganiese uitdunning. Chemiese uitdunmiddels word algemeen in kernvrugproduksie gebruik, maar daar is tans geen chemiese middels vir steenvrugte nie. In hierdie studie was gibberelliene ge-evalueer as potensiële uitdunmiddel. Die Darwin 300TM is ge-evalueer gedurende blomtyd as ‘n meganiese alternatief vir handuitdunning. Die masjien verwyder blomme en verminder so die vruguitdunning benodig. In ons eksperimente op nektarien- en Japanese pruimkultivars het ons gevind dat die tyd benodig vir handuitdunning met tot 50% verminder is deur die Darwin 300TM. Dit het ook daartoe gelei dat die totale oes per boom verlaag is. Hierdie effek kan vermy word deur die rotor spoed te verminder of die strategie vir aanvullende handuitdunning aan te pas. Die feit dat die grootste deel van die uitdunproses in blomtyd uitgevoer is en ook die feit dat die totale oes per boom verlaag is, het daartoe gelei dat die vrugte groter was. Die vroeër uitdunning met die Darwin 300TM kan egter lei tot ‘n verhoging in vrugkrake en gesplete pitte. Dit moet veral in gedagte gehou word by kultivars wat geneig is tot hierdie afwykings/defekte. Die optimum tempo van uitdunning moet vir elke kultivar individueel bepaal word. Wanneer gibberelliensuur (GA3) of gibberelien A4+7 (GA4+7) by pitverharding toegedien word in die vorige groeiseisoen, kan dit lei tot die vermindering van die hoeveelheid vrugte in die volgende seisoen. Daar was geen effek op die totale oes per boom en die vruggrootte tydens oes in die seisoen van aanwending nie, maar die vrugfermheid is verhoog. Die effek was hoër na die GA4+7 as na die GA3 aanwending. Die mikpunt om die tyd benodig vir handuitdunning te verminder, is in sommige kultivars bereik. Die oes per boom in die opvolgseisoen is weer eens nie verlaag nie, maar die vrug rypheid van ‘African Rose’ pruime is vertraag. Geen effek is op die vruggrootte opgemerk nie, maar die vrugfermheid was weer eens verhoog. Die GA-toedienings het dus nie bevredigend die tyd benodig vir handuitdunning verminder nie. ‘n Positiewe effek is die verhoging van die vrugfermheid, wat moontlik kan lei tot die verhoging van die opbergingspotensiaal van die vrugte sonder enige ander negatiewe effekte, maar hierdie aspek benodig verdere navorsing.
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Chabikwa, Tinashe Gabriel. "Chemical thinning of European pear cultivars (Pyrus communis L.)." Thesis, Link to the online version, 2008. http://hdl.handle.net/10019/2023.
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Belayneh, Teferi Yeshitela. "Effect of cultural practices and selected chemicals on flowering and fruit production in some mango (Mangifera indica L.) cultivars." Pretoria : [s.n.], 2004. http://upetd.up.ac.za/thesis/available/etd-01142005-085139.
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Sagredo, Karen X. "Effect of rest-breaking and fruit thinning treatments on reproductive development in apple." Thesis, Link to the online version, 2008. http://hdl.handle.net/10019/2038.
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Zhu, Hong. "Investigation of Regulatory Mechanisms of Chemical-Mediated Fruit Thinning in Apple (Malus X Domestica Borkh.)." Diss., Virginia Tech, 2010. http://hdl.handle.net/10919/30220.
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Fruit thinning is critical to the success of apple industry because most apple trees are prone to biennial bearing characterized by heavy bloom and over-cropping in the â onâ year and low or no cropping in the â offâ year. Fruit thinning can improve fruit size, increase return bloom, and reduce alternate bearing habit of apple trees. Chemical thinning has been widely used as a horticultural practice by growers for years in apple and other fruit production. However, its thinning results are often variable and very difficult to predict since parameters as well as their interactions (e.g. concentration, environmental condition, cultivar response) that affect thinning effectiveness have been poorly defined and the regulatory mechanisms at molecular level remain to be illustrated. Therefore, the purpose of this study is to characterize the physiological and molecular responses of the apple trees to the thinning treatments, and then use key genes as molecular markers for screening potential thinning agents. The long-term goal is to understand how the applied chemicals and environmental factors interact and regulate key regulatory genes as well as the thinning effectiveness during thinning process, and establish a predictable model for the improvement of fruit thinning consistency and effectiveness in apple and other fruit trees.
Effects of naphthaleneacetic acid (NAA), shading, amimoethoxyvinylglycine (AVG) and 1-methylcyclopropene (1-MCP) on young apple fruit abscission, leaf and fruit ethylene production, and the expression of genes related to ethylene biosynthesis, perception and cell wall degradation were examined in â Golden Deliciousâ apples (Malus x domestica borkh.). NAA at 15 mgâ ¢L-1 and shading increased fruit abscission and ethylene production of leaves and fruit when applied at a 12-mm stage of fruit development, whereas AVG, an inhibitor of ethylene biosynthesis, at 250 mgâ ¢L-1 reduced NAA-induced fruit abscission and ethylene production of leaves and fruit. 1-MCP at 160 mgâ ¢L-1 had no effect on fruit abscission but induced ethylene production by both leaves and fruit.
Changes in the gene expression pattern responding to each treatment were analyzed by real-time quantitative PCR. NAA treatment was found to enhance the expression of genes related to ethylene biosynthesis (MdACS5A, MdACS5B and MdACO1) and perception (MdETR1, MdETR1b, MdETR2, MdERS1 and MdERS2). AVG reduced NAA-induced expression of these genes except for MdERS2 in the fruit abscission zone (FAZ). NAA increased the expression of a polygalacturonase gene (MdPG2) in the FAZ but not in the fruit cortex (FC), whereas AVG reduced NAA-enhanced expression of MdPG2 in the FAZ. These results suggest that ethylene biosynthesis, ethylene perception, and MdPG2 gene are involved in young fruit abscission caused by NAA. On the other hand, 1-MCP did not affect the expression of MdACS5A and MdACS5B in the FAZ, although it enhanced the expression of these two genes in the FC from 6 to 24 hours post-treatment. The expression of MdACO1 in both tissues was increased by 1-MCP after 3 or more days post-treatment. 1-MCP had only a small influence on the expression of most ethylene receptor genes, with the exception of MdETR1, which was up-regulated in the FC to a level similar to that observed for NAA treatment. In response to 1-MCP, in the FAZ, the expression of MdCel1 and MdPG2 was up-regulated at the beginning and the end, respectively, of the experiment, but otherwise remained at or below control levels. 1-MCP did not inhibit NAA-induced abscission of young apple fruit, suggesting that abscission does not solely depend on ethylene signal transduction, or that the periods of effectiveness for 1-MCP and ethylene were asynchronous in this study. Gene expression analysis also revealed that both NAA and shading enhanced the expression of gene related to ABA biosynthesis in the FAZ, which suggested the involvement of ABA in young fruit abscission.
Global gene expression profile during young fruit abscission was analyzed using an apple oligonucleotide microarray. More than 700 genes were identified with reproducible changes in transcript abundance in the FAZ after NAA treatment. Genes associated with abscission, ethylene, ABA, cell wall degradation, mitochondrial activity, glycolysis, lipid catabolism, secondary metabolism, abiotic stress, and apoptosis were upregulated, while genes involved in regulation of cell cycle, cell wall biosynthesis, photosynthesis, carbon fixation, chromatin assembly, auxin transport/efflux, cytoskeleton function, and flower development were generally downregulated. Comparison of changes in the gene expression patterns during NAA-induced fruit abscission with shading-induced fruit abscission revealed similarities, but also considerable differences. The data suggested that young fruit were shutting down growth and energy production and undergoing a certain kind of programmed cell death (PCD) induced by these different stimuli. Gene expression analysis in abscising young fruit revealed that photosynthesis, carbon utilization, and ABA/ethylene pathways appeared to operate in both NAA- and shading-induced fruit abscission. However, more sugar signaling genes were regulated in shading-induced fruit abscission, compared to NAA-induced fruit abscission.Ph. D.
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Alrashedi, Mubarak Mohammed. "Blossom thinning and managing bitter pit, storage life and fruit quality in organically grown apples." Thesis, Curtin University, 2015. http://hdl.handle.net/20.500.11937/1097.
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Blossom thinning and application of calcium influence storage life and apple fruit quality. Spray application of lime sulphur (4-5%) with olive oil (3%) and 0.05% synertrol oil as a surfactant at 75% bloom was most effective in reducing crop load with minimum leaf scorching and improved fruit quality in organically grown apple. Four spray applications of Biomin® calcium (3kg/ha) were highly effective in reducing bitter pit, scald and maintaining organic apple fruit quality.
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Rosa, Nídia Diana Heleno. "Comparison between benzyladenine and metamitron as chemical thinning agents in Gala, Kanzi, Pink Lady and Red Delicious apple cultivars." Master's thesis, ISA - Ul, 2016. http://hdl.handle.net/10400.5/12172.
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Mestrado em Engenharia Agronómica - Instituto Superior de Agronomia - ULThis experiment was conducted in PCFruit Research Station orchards in Sint-Truiden, Belgium in 2015, in ‘Gala’, ‘Kanzi®’, ‘Pink Lady®’ and ‘Red Delicious’. Four treatments were tested: untreated, manual thinning, two applications of 165 ppm of metamitron at 8 and 12 mm and one application of 150 ppm of benzyladenine between 8 and 12 mm fruit diameter. All cultivars were sprayed on the same days. Fruit drop was counted, phytotoxicity evaluated after June drop, fruit growth rate was assessed and photosynthetic efficiency was measured. Fruit drop was higher in all cultivars with metamitron application than with benzyladenine (P<0.05). A greater growth rate in fruits treated with metamitron was registered, as well as, a positive correlation between the sum of the PSII efficiency and the thinning percentage (R2=0.98). A relation between the duration of the blocking effect of metamitron and phytotoxicity level in the trees was observed. At harvest, metamitron and manual thinning showed the best results in average fruit weight, in all cultivars. Despite the size improvements, the only influence in quality was observed in ‘Pink Lady®’ Brix° values. All cultivars thinned with 150 ppm benzyladenine were far from the ideal crop load for fruit size, probably due to the poor weather conditions after application, while with two times 165 ppm metamitron sprays had the same results as manual thinning. ‘Pink Lady®’ was the easiest cultivar to thin, with a slight over thinning effect, followed by ‘Gala’, that achieved the ideal crop load and ‘Red Delicious’ was the most difficult to thin. It was not possible to compare ‘Kanzi®’ with the other cultivars due to the poor fruitset observed before the product’s application. Metamitron doses can be adjusted to achieve optimum results; in ‘Pink Lady®’ the dose should be lower while in ‘Red Delicious’ higher. A simpler version of the Greene model was tested the percentage of error was 7.5% for fruits treated with metamitron while in benzyladenine treated fruits was 18%.
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Fernandes, Carla Maria Correia. "Monda em macieira Fuji. Comparação entre novas substâncias quimicas e a monda manual." Master's thesis, ISA/UTL, 2010. http://hdl.handle.net/10400.5/5362.
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Mestrado em Engenharia Agronómica - Hortofruticultura e Viticultura - Instituto Superior de AgronomiaThe chemical agents, ammonium thiosulphate (ATS) (1%), 6-benzyladenine (BA) (100 ppm) and metamitron (100, 175, and 350 ppm) were evaluated as thinning agents on 3 years old „Fuji‟ grafted on to M9 apples trees. The products were used alone, at single or double application or in combination. There were no differences between treatments regarding yield, mean fruit weight and number of commercial fruits (70 – 85 mm) but there were differences concerning the greater and smaller fruit size classes. The fruit set was reduced by metramitron, but when considering different crop loads its action was independent of the crop load for the 175 and 350 ppm concentrations, however, an over thinning effect was observed at 350 ppm in trees with low crop load. Probably, unfavourable weather conditions during the application period of ATS+BA has jeopardized its effectiveness. Hand thinning, leaving one fruit per cluster spaced of 15 cm, was the best option, but is often impossible because of labor costs and the limited supply of available labor
Books on the topic "Fruit thinning"
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Ingels, Chuck, Pamela Geisel, and Carolyn L. Unruh. Fruit Trees: Thinning Young Fruit. University of California, Agriculture and Natural Resources, 2001.
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Branch, British Columbia Horticultural, ed. Thinning tree-fruits. Victoria, B.C: W.H. Cullin, 1997.
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Gu, Sanliang. Effect of crop density on vegetative and fruit growth and on mineral status in Nijiseiki pear (Pyrus pyrifolia). 1987.
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Dorsey, M. J. 1880, and R. L. 1898 McMunn. Tree-Conditioning the Peach Crop: A Study of the Effect of Thinning and Other Practices on Size and Quality of Fruit. Creative Media Partners, LLC, 2018.
Find full textBook chapters on the topic "Fruit thinning"
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Costa, Guglielmo, Alessandro Botton, and Giannina Vizzotto. "Fruit Thinning." In Horticultural Reviews, 185–226. Hoboken, NJ, USA: John Wiley & Sons, Inc., 2018. http://dx.doi.org/10.1002/9781119521082.ch4.
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DeJong, T. M. "Understanding the fruit sink." In Concepts for understanding fruit trees, 67–91. Wallingford: CABI, 2022. http://dx.doi.org/10.1079/9781800620865.0009.
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Abstract This chapter deals with understanding the fruit sink by studying the floral development and structures; pollination, fertilization, fruit set and types; limitations of fruit growth; thinning effects on fruit growth, size and yield; spring temperature effects on fruit size; nut development and growth; and the condition of alternate bearing.
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Byers, Ross E., Guglielmo Costa, and Giannina Vizzotto. "Flower and Fruit Thinning of Peach and otherPrunus." In Horticultural Reviews, 351–92. Oxford, UK: John Wiley & Sons, Inc., 2010. http://dx.doi.org/10.1002/9780470650851.ch7.
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"Fruit Thinning." In Pomegranate Production and Marketing, 73–75. CRC Press, 2016. http://dx.doi.org/10.1201/b20151-14.
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"APPLE FLOWER AND FRUIT THINNING." In Environment and Crop Production, 61–64. CRC Press, 2002. http://dx.doi.org/10.1201/9781482280012-10.
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Sharabasy, Shrief Fathy, and Hesham Sayed Ghazzawy. "Good Agricultural Practices for Date Palms (Phoenix dactylifera L.)." In Handbook of Research on Principles and Practices for Orchards Management, 185–202. IGI Global, 2022. http://dx.doi.org/10.4018/978-1-6684-2423-0.ch011.
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Date palm (Phoenix dactylifera L.), commonly grown in the hot arid zones predominantly in the Middle East and North Africa, provides highly healthy fruits in addition to multiple uses for all parts of the tree. With the interest of many countries of the world in the direction towards planting palm trees, it was therefore significant to point out the importance of agricultural practices that are concerned with serving the palm crown, such as pollination, pruning, fruit thinning, bunch covering, and bagging fruits. The paramount importance of soil service and irrigation operations that will obtain the highest productivity of trees and achieve remunerative profits for the stakeholders and those interested in the palm sector from breeders and factory owners are shown. The latest technologies and modern programs that serve this essential agricultural sector were reviewed.
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Siddhesh Shamrao, Bhende. "Production Technology of Peach, Plum and Apricot in India." In Prunus. IntechOpen, 2020. http://dx.doi.org/10.5772/intechopen.92884.
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In this chapter production technology of peach, plum and apricot in India is elaborated in detail in relation to introduction, origin and distribution of crop, importance and uses, morphological features of tress, other related species involved, climate and soil requirement, varieties, propagation and raising of rootstocks, planting and planting densities, cropping systems, manure and fertilisers application, cultural practices, weed management, orchard floor management, after care training and pruning, pollination and pollinizers, flowering and crop regulation, use of growth regulators, fruiting in the crop, fruit thinning and drop, maturity and harvesting, post-harvest management, handling and storage, insects, pests and diseases, special production problems like low productivity, unfruitfulness and self-incompatibility, premature leaf fall, replant problem, alternate bearing and remedies and physiological disorders of the crop.
Conference papers on the topic "Fruit thinning"
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Cvijanovic, Jelisaveta Seka, Miljan Cvetkovic, and Tatjana Jovanovic-Cvetkovic. "UTICAJ PROREĐIVANJA PUPOLJAKA NA KVALITET PLODOVA TREŠNJE (Prunus avium L.) SORTI ‘KORDIA’ I ‘SWEETHEART’." In SAVETOVANJE o biotehnologiji sa međunarodnim učešćem. University of Kragujevac, Faculty of Agronomy, 2021. http://dx.doi.org/10.46793/sbt26.125c.
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Thinning the buds of May flowers, as an pomotechnical measure, can significantly increase the average fruit size. The paper presents the results of thinning of buds of cultivars "Kordia" and "Dušice" on rootstocks "Gisela 5" and "Gisela 6" grown in the system of Vogel spindles. The examined cultivars reacted positively to the thinning of the buds by increasing the fruit weight, which was especially expressed in the cultivar 'Kordia'. Thinning of the buds had a positive effect on the presence of marketable fruits, although not to a significant extent.
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Zhang, Xiancong, Yanan Wang, Jun Wang, and Xun Wang. "Effects of fruit thinning on blueberry fruit maturation and quality." In 2017 3rd International Forum on Energy, Environment Science and Materials (IFEESM 2017). Paris, France: Atlantis Press, 2018. http://dx.doi.org/10.2991/ifeesm-17.2018.394.
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Ou, Ruohan, Yanping Fan, Yanan Wang, Jing Yang, and Xun Wang. "Blueberry thinning improved fruit quality and put forward maturation." In 2017 3rd International Forum on Energy, Environment Science and Materials (IFEESM 2017). Paris, France: Atlantis Press, 2018. http://dx.doi.org/10.2991/ifeesm-17.2018.380.
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Meng Wang, Hui Wang, Qin Zhang, Karen M Lewis, and Patrick A Scharf. "A Hand-held Mechanical Blossom Thinning Device for Fruit Trees." In 2011 Louisville, Kentucky, August 7 - August 10, 2011. St. Joseph, MI: American Society of Agricultural and Biological Engineers, 2011. http://dx.doi.org/10.13031/2013.37213.
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STARKUS, Aurelijus, Dalia GELVONAUSKIENĖ, Birutė FRERCKS, Vidmantas BENDOKAS, Audrius SASNAUSKAS, and Vidmantas STANYS. "RELATION BETWEEN APPLE-TREE YIELD SELF-REGULATION AND METEOROLOGICAL CONDITIONS DURING FRUIT SET." In RURAL DEVELOPMENT. Aleksandras Stulginskis University, 2018. http://dx.doi.org/10.15544/rd.2017.066.
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Apple has a tendency to bear huge amount of flowers or inflorescences. Plants have ability to eliminate excess number of fruitlets. Frequently fruit trees eliminate insufficient number of fruitlets to grow good quality fruits. Most processes related to yield self-regulation varies significantly between different apples varieties. Also meteorological conditions influenced flower buds differentiation and fruit growth during blooming and other development stages. The investigations were carried out in 2015 – 2016 at the Institute of Horticulture. The main aim was to evaluate yield self-regulation peculiarity in various apple varieties in different meteorological conditions. In our experiment we made fruit self – thinning evaluation of 15 different varieties. Meteorological conditions were varying. In 2015 there was lack of rainfall, while 2016 year was rainy. After each fruit-drop period the number of developed and undeveloped seeds were counted of self-sheded and normally growing fruits. Amount of developed seeds as auxins source is one of the most important factor for yield self-regulation. Varieties of apple which are blooming abundantly and eliminate high amount of fruitlets, grows fruits until maturity with stabile amount of developed seeds and produces permanent harvest annually, independently from meteorological conditions during vegetation. Such apple varieties need higher amount of developed seeds to inhibit abscission. Apple varieties tended to bloom abundantly and eliminate small amount of fruitlets depending on meteorological conditions. Demand of auxins to carry fruits depends on meteorological conditions therefore these apple-trees develop different amount of seeds, when weather conditions changes. We may presume, that different apple varieties need different amount of phytohormones or their ratio to hold fruitlets on the apple. Therefore apple trees with smaller amount of seeds in fruits grow more fruits to its normal size.
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Hou, Bin, Yan Huang, Qiong Zhou, and Jin Wang. "The effect of Different degree of Fruit thinning on the Quality of lSummer Blackr Grape." In 2018 7th International Conference on Energy and Environmental Protection (ICEEP 2018). Paris, France: Atlantis Press, 2018. http://dx.doi.org/10.2991/iceep-18.2018.286.
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Mirbod, Omeed, Daeun Choi, Paul H. Heinemann, Long He, and James R. Schupp. "In-Field Apple Size and Location Tracking Using Machine Vision to Assist Fruit Thinning and Harvest Decision-Making." In 2021 ASABE Annual International Virtual Meeting, July 12-16, 2021. St. Joseph, MI: American Society of Agricultural and Biological Engineers, 2021. http://dx.doi.org/10.13031/aim.202100831.
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Miyano, Hiroshi, Katsuji Maeda, Masayuki Takizawa, and Naoto Sekimura. "Review of Pipe Wall Thinning and Seismic Evaluation in Japan." In ASME 2009 Pressure Vessels and Piping Conference. ASMEDC, 2009. http://dx.doi.org/10.1115/pvp2009-78037.
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For nuclear power plants, the four major requirements are 1) high safety, 2) high reliability, 3) good economical acceptability, and 4) as few as possible environmental impact. However, it is still difficult to completely avoid problems for structural materials as structural stress corrosion cracking (SCC) and for piping systems as flow accelerated corrosion (FAC), liquid drop impulsion erosion (LDI). Especially FAC and LDI are uncertainty phenomenon as pipe wall thinning, so there is the piping rupture accident risk on all of piping systems under the specific conditions. In Japan, after in August 2004, the accident of the secondary pipe rupture in Mihama Power Plant Unit 3, The Kansai Electric Power Co., Inc. (KEPCO), R&D projects about pipe wall thinning phenomenon and mechanism had been promoted in many organizations. The other hand it is requested to evaluate the safety and reliability of piping systems of long term operating plant and with on special case of seismic condition. It was requested to be able to evaluate pipe wall thinning and its reliability with more accurate. This project had programmed under the government budget from 2006 planed until 2010 fiscal year [1]. At the mile stone of half span, the project had these fruits, 1) Computer program for FAC simulation, 2) Droplet phenomena for LDI simulation, 3) Simplified calculation model of pipe wall thinning for seismic evaluation.
Reports on the topic "Fruit thinning"
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Shoseyov, Oded, Steven A. Weinbaum, Raphael Goren, and Abhaya M. Dandekar. Biological Thinning of Fruit Set by RNAase in Deciduous Fruit Trees. United States Department of Agriculture, August 1993. http://dx.doi.org/10.32747/1993.7568110.bard.
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Fruit thinning is a common and necessary practice for commercial fruit production in many deciduous tree fruit species. Fruit thinning in apple may be accomplished with a variety of chemical thinning agents, but the use of these chemicals is a subject of environmental concern. It has been shown recently that RNase enzyme, secreted from the stigma and the style, inhibits pollen germination and pollen tube elongation. In this study we have been able to show that Aspergillus niger B-1 RNase can effectively inhibit peach and apple pollen germination, and tube elongation in-vitro, as well as thin fruit in peach and apple, and reduce the number of seeds in citrus. The objectives of the research were to detrmine the conditions for effective thinning of (USA and Israel), develop fermentation process for cost effective production of RNase from A. niger. (Israel), and clone apple S-RNase cDNA (USA). All the objectives of the research were addressed. We have determined the optimal fermentation conditions for cost effective production of the A. niger at a 20,000 liters scale. TheA. niger B1 RNase was isolated to homogeneity and its kinetic and biochemical properties including its N-terminal sequence were fully characterized. The field test results both in Israel and California have shown variability in effectiveness and more work is needed to define the RNase concentration necessary to completely inhibit pollen development. Plant transformation vectors expressing anti-sense apple S-RNase genes were constructed (USA) with an attempt to produce self compatible transgenic apple trees. Bovine S-Protein cDNA was cloned and successfully expressed in E. coli (Israel). Plant transformation vector expressing the S-Protein gene was constructed (USA) with an attempt to produce transgenic plants expressing S-protein in the style. Exogenous application of S-peptide to these plants will result in active RNase and consequently prevention of fertilization.