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Journal articles on the topic 'Multi-harvest'

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Author: Grafiati

Published: 10 December 2022

Last updated: 29 January 2023

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1

Lorentsen, Svein-Håkon, Kjersti Sjøtun, and David Grémillet. "Multi-trophic consequences of kelp harvest." Biological Conservation 143, no. 9 (September 2010): 2054–62. http://dx.doi.org/10.1016/j.biocon.2010.05.013.

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2

Potts, Matthew D., and Jeffrey R. Vincent. "Harvest and extinction in multi-species ecosystems." Ecological Economics 65, no. 2 (April 2008): 336–47. http://dx.doi.org/10.1016/j.ecolecon.2007.06.020.

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3

Faveri, Joanne De, Arūnas P. Verbyla, Wayne S. Pitchford, Shoba Venkatanagappa, and Brian R. Cullis. "Statistical methods for analysis of multi-harvest data from perennial pasture variety selection trials." Crop and Pasture Science 66, no. 9 (2015): 947. http://dx.doi.org/10.1071/cp14312.

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Variety selection in perennial pasture crops involves identifying best varieties from data collected from multiple harvest times in field trials. For accurate selection, the statistical methods for analysing such data need to account for the spatial and temporal correlation typically present. This paper provides an approach for analysing multi-harvest data from variety selection trials in which there may be a large number of harvest times. Methods are presented for modelling the variety by harvest effects while accounting for the spatial and temporal correlation between observations. These methods provide an improvement in model fit compared to separate analyses for each harvest, and provide insight into variety by harvest interactions. The approach is illustrated using two traits from a lucerne variety selection trial. The proposed method provides variety predictions allowing for the natural sources of variation and correlation in multi-harvest data.

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4

GORMAN, D., S. MAYFIELD, T. M. WARD, and P. BURCH. "Optimising harvest strategies in a multi-species bivalve fishery." Fisheries Management and Ecology 18, no. 4 (January 5, 2011): 270–81. http://dx.doi.org/10.1111/j.1365-2400.2010.00781.x.

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5

Pascoe, Sean, Toni Cannard, Natalie Dowling, Catherine Dichmont, Sian Breen, Tom Roberts, Rachel Pears, and George Leigh. "Developing Harvest Strategies to Achieve Ecological, Economic and Social Sustainability in Multi-Sector Fisheries." Sustainability 11, no. 3 (January 26, 2019): 644. http://dx.doi.org/10.3390/su11030644.

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Ecosystem based fisheries management (EBFM) provides a framework to achieve ecological, economic and social sustainability in fisheries. However, developing harvest strategies to achieve these multiple objectives is complex. This is even more so in multi-sector multi-species fisheries. In our study, we develop such harvest strategies for the multi-species Coral Reef Fin Fish Fishery (CRFFF) operating in the waters of Australia’s Great Barrier Reef. The fishery includes recreational, charter and commercial sectors, and is a provider of regional employment and supplier of seafood to both local and export markets. We convened a series of stakeholder workshops and conducted surveys to identify stakeholder objectives and priorities, as well as potential harvest strategy frameworks for the fishery. These potential harvest strategies were assessed against the objectives using a further qualitative impact survey. The analysis identified which frameworks were preferred by different stakeholder groups and why, taking into account the different objective priorities and tradeoffs in outcomes. The new feature of the work was to qualitatively determine which harvest strategies are perceived to best address triple bottom line objectives. The approach is therefore potentially applicable in other complex fisheries developing harvest strategies which, by design, strive to achieve ecological, economic and social sustainability.

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6

Feng, Mingjie, and Shiwen Mao. "Harvest the potential of massive MIMO with multi-layer techniques." IEEE Network 30, no. 5 (September 2016): 40–45. http://dx.doi.org/10.1109/mnet.2016.7579025.

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7

Varas, Mauricio, Franco Basso, Sergio Maturana, David Osorio, and Raúl Pezoa. "A multi-objective approach for supporting wine grape harvest operations." Computers & Industrial Engineering 145 (July 2020): 106497. http://dx.doi.org/10.1016/j.cie.2020.106497.

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8

Hu, Junyong, Shiming Xu, Xi Wu, Debing Wu, Dongxu Jin, Ping wang, and Qiang Leng. "Multi-stage reverse electrodialysis: Strategies to harvest salinity gradient energy." Energy Conversion and Management 183 (March 2019): 803–15. http://dx.doi.org/10.1016/j.enconman.2018.11.032.

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9

Costa, Weverton Gomes da, Ivan de Paiva Barbosa, Jacqueline Enequio de Souza, Cosme Damião Cruz, Moysés Nascimento, and Antonio Carlos Baião de Oliveira. "Machine learning and statistics to qualify environments through multi-traits in Coffea arabica." PLOS ONE 16, no. 1 (January 12, 2021): e0245298. http://dx.doi.org/10.1371/journal.pone.0245298.

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Several factors such as genotype, environment, and post-harvest processing can affect the responses of important traits in the coffee production chain. Determining the influence of these factors is of great relevance, as they can be indicators of the characteristics of the coffee produced. The most efficient models choice to be applied should take into account the variety of information and the particularities of each biological material. This study was developed to evaluate statistical and machine learning models that would better discriminate environments through multi-traits of coffee genotypes and identify the main agronomic and beverage quality traits responsible for the variation of the environments. For that, 31 morpho-agronomic and post-harvest traits were evaluated, from field experiments installed in three municipalities in the Matas de Minas region, in the State of Minas Gerais, Brazil. Two types of post-harvest processing were evaluated: natural and pulped. The apparent error rate was estimated for each method. The Multilayer Perceptron and Radial Basis Function networks were able to discriminate the coffee samples in multi-environment more efficiently than the other methods, identifying differences in multi-traits responses according to the production sites and type of post-harvest processing. The local factors did not present specific traits that favored the severity of diseases and differentiated vegetative vigor. Sensory traits acidity and fragrance/aroma score also made little contribution to the discrimination process, indicating that acidity and fragrance/aroma are characteristic of coffee produced and all coffee samples evaluated are of the special type in the Mata of Minas region. The main traits responsible for the differentiation of production sites are plant height, fruit size, and bean production. The sensory trait "Body" is the main one to discriminate the form of post-harvest processing.

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10

Öhman, Karin, and Tomas Lämås. "Clustering of harvest activities in multi-objective long-term forest planning." Forest Ecology and Management 176, no. 1-3 (March 2003): 161–71. http://dx.doi.org/10.1016/s0378-1127(02)00293-1.

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11

Neto, Teresa, Miguel Constantino, Isabel Martins, and João Pedro Pedroso. "A multi-objective Monte Carlo tree search for forest harvest scheduling." European Journal of Operational Research 282, no. 3 (May 2020): 1115–26. http://dx.doi.org/10.1016/j.ejor.2019.09.034.

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12

Sungnul, Surattana, Wisanlaya Pornprakun, Santipong Prasattong, and Chanasak Baitiang. "Multi-Objective Mathematical Model for the Optimal Time to Harvest Sugarcane." Applied Mathematics 08, no. 03 (2017): 329–43. http://dx.doi.org/10.4236/am.2017.83028.

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13

Kumar, Sushil, S. K. Gupta, Poorinima Singh, Pratima Bajpai, M. M. Gupta, Digvijay Singh, A. K. Gupta, Govind Ram, A. K. Shasany, and Srikant Sharma. "High yields of artemisinin by multi-harvest of Artemisia annua crops." Industrial Crops and Products 19, no. 1 (January 2004): 77–90. http://dx.doi.org/10.1016/j.indcrop.2003.07.003.

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14

Manning, Sydney E., Bryan S. Stevens, and David M. Williams. "Simulated performance of multi‐year harvest regulation cycles for wild turkeys." Journal of Wildlife Management 83, no. 5 (May 6, 2019): 1032–42. http://dx.doi.org/10.1002/jwmg.21678.

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15

McNairn, H., C. Duguay, J. Boisvert, E. Huffman, and B. Brisco. "Defining the Sensitivity of Multi-Frequency and Multi-Polarized Radar Backscatter to Post-Harvest Crop Residue." Canadian Journal of Remote Sensing 27, no. 3 (June 2001): 247–63. http://dx.doi.org/10.1080/07038992.2001.10854941.

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16

Sirangelo, Tiziana M., Hilary J. Rogers, and Natasha D. Spadafora. "Multi-Omic Approaches to Investigate Molecular Mechanisms in Peach Post-Harvest Ripening." Agriculture 12, no. 4 (April 13, 2022): 553. http://dx.doi.org/10.3390/agriculture12040553.

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Peach post-harvest ripening is a complex developmental process controlled by a plethora of genetic and epigenetic factors. Specifically, it leads to protein, lipid and nucleic acid degradation, all resulting in cell death. Substantial research has been directed at investigating peach regulatory mechanisms underlying genomic, metabolomic and transcriptomic modifications occurring during this stage, and much progress has been made thanks to the advent of Next Generation Sequencing technologies. This review is focused on the latest multi-omics studies, with the aim of highlighting the most significant results and further investigating the regulation of the key genes involved in peach post-harvest processes and related physiology. By offering an exhaustive overview of peach omics profiles, it provides a comprehensive description of gene expression changes and their correlation with ripening stages, including some post-harvest treatments, as well as with volatile organic compound modifications. However, the present work highlights that, due to the complexity of the process, recent investigations do not elucidate all underlying molecular mechanisms, making further studies still necessary. For this reason, some key points for future research activities and innovative peach breeding programs are discussed, relying on trusted multi-omic approaches.

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17

Wu, Linhai, Qipeng Hu, Jianhua Wang, and Dian Zhu. "Empirical analysis of the main factors influencing rice harvest losses based on sampling survey data of ten provinces in China." China Agricultural Economic Review 9, no. 2 (May 2, 2017): 287–302. http://dx.doi.org/10.1108/caer-03-2016-0036.

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Purpose In China, a major grain producer, rice losses during harvest cannot be ignored. The purpose of this paper is to assess the extent of rice harvest losses in major grain-producing areas in China by a sampling survey, and to further analyze the main factors influencing rice harvest losses using an ordered multinomial logistic model. Design/methodology/approach In this study, data were collected using a multi-stage sampling method from ten major rice-producing provinces/regions in China. On this basis, five counties were selected from each of these provinces/regions. In the actual survey, house numbers were randomly selected, and then corresponding farmer households were visited by trained investigators. Findings The survey found that 56.22 percent of respondents believed that rice harvest losses were 4 percent or lower in China, though there were differences among the provinces. The proportion of family business income, planting scale, mechanization level, timely harvest, and operational meticulousness had negative effects on rice harvest losses. On the other hand, farmers’ experience of employment as migrant workers had a positive effect on rice harvest losses. In addition, bad weather and short handedness during harvest significantly increased rice harvest losses. Originality/value The meaning of rice harvest losses was defined based on previous research findings on the definition of grain harvest losses and the realities in China. The current rice harvest losses in different areas in China were analyzed based on sampling survey data from 957 farmers in ten provinces in China.

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18

Sark, J. F., and N. Jullok. "Pressure retarded osmosis – a multi-functional osmotic energy membrane-based harvest technology." IOP Conference Series: Earth and Environmental Science 765, no. 1 (May 1, 2021): 012026. http://dx.doi.org/10.1088/1755-1315/765/1/012026.

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19

Ledford, Gwendolyn M., Alyssa Hartsell, and Samuel Hohmann. "Resource Utilization in Allogeneic Bone Marrow Harvest Procedures: A Multi-Hospital Perspective." Biology of Blood and Marrow Transplantation 25, no. 3 (March 2019): S306. http://dx.doi.org/10.1016/j.bbmt.2018.12.661.

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20

Lin, Zhiming, Hongyun Li, Shaobo Lv, Binbin Zhang, Zhiyi Wu, and Jin Yang. "Magnetic Force-Assisted Nonlinear Three-Dimensional Wideband Energy Harvester Using Magnetostrictive/Piezoelectric Composite Transducers." Micromachines 13, no. 10 (September 29, 2022): 1633. http://dx.doi.org/10.3390/mi13101633.

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This paper presents a nonlinear magnetoelectric energy harvester which has the potential to harvest vibrational energy over a wide bandwidth in arbitrary motion directions. Three springs with equal intersection angles are adopted to absorb the multi-directional vibration energy. Magnetic interaction between the magnets and ME transducers allows the nonlinear motion with enhanced harvesting frequency range. Very good agreement is observed between the numerical and experimental open-circuit voltage output frequency response curves. The experimental results show that the harvester can harvest vibrational energy in an arbitrary direction, exhibiting a further bandwidth of 5.2 Hz. This study provides a new solution to effectively use the magnetoelectric energy harvester for multi-directional and bandwidth vibrational energy scavenging in the surrounding environment.

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21

Fenton, Nicole J., Louis Imbeau, Timothy Work, Jenna Jacobs, Hervé Bescond, Pierre Drapeau, and Yves Bergeron. "Lessons learned from 12 years of ecological research on partial cuts in black spruce forests of northwestern Québec." Forestry Chronicle 89, no. 03 (June 2013): 350–59. http://dx.doi.org/10.5558/tfc2013-065.

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Multi-cohort management that creates or maintains an uneven structure within forest stands has been widely advocated as a means to attenuate the impact of forest harvesting. An experimental network was put in place in black spruce forests of northwestern Québec to test this assertion. Here we synthesize the biodiversity results in two main lessons: (1) at least 40% to 60% retention of pre-harvest basal area was required to maintain pre-harvest conditions for most species groups; (2) partial harvests showed the potential to be efficient deadwood delivery systems. In addition to these two main general conclusions, we emphasise that future research should examine whether partial harvest may be able to advance forest succession.

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22

Beese, W. J., and J. T. Arnott. "Montane Alternative Silvicultural Systems (MASS): Establishing and managing a multi-disciplinary, multi-partner research site." Forestry Chronicle 75, no. 3 (June 1, 1999): 413–16. http://dx.doi.org/10.5558/tfc75413-3.

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The Montane Alternative Silvicultural Systems (MASS) study was established on Vancouver Island, B.C. to develop operationally feasible and ecologically sustainable silvicultural systems in old-growth forests. The project addresses regeneration, biodiversity and aesthetic concerns over clearcutting at high elevations. Over twenty integrated studies are examining the biological and economic consequences of shelterwood, small patch clearcut, dispersed green tree retention and clearcut alternatives. Planning and pre-harvest studies began two years before the 1993 harvesting. The Forest Engineering Research Institute of Canada (FERIC) documented the cost and feasibility of harvesting. Post-harvest studies have been underway for five years with funding by the Canada-B.C. Forest Resource Development Agreement (ERDA II), Forest Renewal BC (FRBC), Industry Canada and project cooperators. There are numerous challenges associated with establishing and managing a multi-disciplinary, long-term research site with multiple partners. This paper discusses the administrative aspects of integrated research based on our experience with the MASS project. Key words: research cooperative, silvicultural systems, old-growth forests

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23

Kamanda, Philip Jimia, Edwin Julius Jeblar Momoh, Masa Veronicah Motaung, and Keiwoma Mark Yila. "Factors Influencing Adoption of the New Rice for Africa Technologies by Smallholder Farmers in Selected Chiefdoms in Sierra Leone." Journal of Agricultural Extension 26, no. 3 (August 8, 2022): 23–33. http://dx.doi.org/10.4314/jae.v26i3.3.

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The study examined factors influencing adoption of NERICA rice production and post-harvest technologies by smallholder farmers in Magbema and Kaiyamba chiefdoms in Sierra Leone. The data were purposively obtained from 150 smallholder NERICA farmers through a multi-stage sampling procedure from NERICA farmers in both chiefdoms. A structured questionnaire was used to collect data, analyzed with the aid of percentage and logistic regression. Demographic and socioeconomic characteristics of the farmers significantly influenced the adoption of recommended NERICA production technologies. For the post-harvest technologies, the R2 of 0.26 suggests that only the socioeconomic characteristics of the farmers significantly influenced the adoption of the recommended NERICA post-harvest technologies. Contact with extension agents, promotion of a literacy drive to raise technological awareness among farmers, and timely input delivery to attract and sustain the farmers’ interest to adopt NERICA rice production and post-harvest technologies.

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24

Zhang, Zhao, Zhaohua Zhang, Xinmiao Wang, Hu Liu, Yuanjie Wang, and Weijie Wang. "Models for economic evaluation of multi-purpose apple harvest platform and software development." International Journal of Agricultural and Biological Engineering 12, no. 1 (2019): 74–83. http://dx.doi.org/10.25165/j.ijabe.20191201.4360.

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25

Mendoza, Martin, Juan Fajardo, Gonzalo Curiel, Francisco Domínguez, Maribel Apodaca, María Rodríguez-Camarillo, and Jesús Zepeta. "Harvest Regulation for Multi-Resource Management, Old and New Approaches (Old and New)." Forests 6, no. 12 (March 9, 2015): 670–91. http://dx.doi.org/10.3390/f6030670.

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26

Liu, Haili, Tianzhu Xu, Zhenyu Huang, and Dayue Chen. "Parametric design for a piezoelectric cantilever carrying oscillators to harvest multi-frequency vibration energy." International Journal of Applied Electromagnetics and Mechanics 41, no. 4 (February 7, 2013): 389–405. http://dx.doi.org/10.3233/jae-121620.

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27

González-González, José Mario, Miguel Ernesto Vázquez-Méndez, and Ulises Diéguez-Aranda. "Multi-objective models for the forest harvest scheduling problem in a continuous-time framework." Forest Policy and Economics 136 (March 2022): 102687. http://dx.doi.org/10.1016/j.forpol.2021.102687.

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28

Zhang, Yi, Qiaoling Zhang, and Lichun Zhao. "Optimal harvest of an interval model of carbon sink fisheries with multi-trophic levels." International Journal of Biomathematics 09, no. 03 (February 25, 2016): 1650034. http://dx.doi.org/10.1142/s1793524516500340.

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Considering the uncertainty of kelp–abalone–sea cucumber population, an interval model of carbon sink fisheries with multi-trophic levels is proposed. The equilibria of the model are identified and the corresponding stabilities are discussed. And the existence of bionomic equilibrium of the model is investigated. Next the optimal controller is designed to obtain the optimal harvest using Pontryagin’s maximum principle. Numerical simulations are carried to prove the results.

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Ezzati, Sattar, Akbar Najafi, and Pete Bettinger. "Finding feasible harvest zones in mountainous areas using integrated spatial multi-criteria decision analysis." Land Use Policy 59 (December 2016): 478–91. http://dx.doi.org/10.1016/j.landusepol.2016.09.020.

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30

da Silva, Aneirson Francisco, Fernando Augusto Silva Marins, and Erica Ximenes Dias. "Addressing uncertainty in sugarcane harvest planning through a revised multi-choice goal programming model." Applied Mathematical Modelling 39, no. 18 (September 2015): 5540–58. http://dx.doi.org/10.1016/j.apm.2015.01.007.

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31

Rukmani, N., T. Chitdeshwari, P. Malarvizhi, M. Maheswari, S. Karthikeyan, and S. Marimuthu. "Changes in biochemical constituents and antioxidant enzyme activity in groundnut (Arachis hypogaea L.) by the addition of coated multi-nutrient fertilization in calcareous soil." Journal of Applied and Natural Science 14, no. 4 (December 19, 2022): 1100–1109. http://dx.doi.org/10.31018/jans.v14i4.3762.

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Sulphur and micronutrients play a vital in the growth and development of plants due to their catalytic effect on many metabolic processes. A field experiment was conducted to explore the changes in various biochemical constituents and antioxidants enzyme activities in response to coated multi-nutrient fertilization. The experiment consisted of five organic acids (citric acid, humic acid, fulvic acid, salicylic acid) and amino acid (glycine) coated multi-nutrient fertilizer sources applied at five different levels (0, 5, 10, 12.5 and 15 kg ha-1). Groundnut leaf samples were collected and analyzed for biochemical constituents such as proline, soluble protein and antioxidant enzymes viz., superoxide dismutase, catalase, peroxidase and carbonic anhydrase activities at harvest stages. The results revealed that, application of fulvic acid coated multi-nutrient fertilizer at 15 kg ha-1 registered lesser proline (5.93 µmoles g-1) and higher soluble protein (22.2 mg g-1) content, superoxide dismutase (8.93 EU mg-1), catalase (18.2 µg H2O2 min-1 g˗1), peroxidase (6.11 µg min-1 mg˗1) and carbonic anhydrase (14.8 EU mg-1) activities at harvest stage followed by 12.5 kg humic acid coated multi-nutrient fertilizer. The lesser response was noted with NPK control in influencing the biochemical constituents and antioxidant enzymes. It was concluded that fulvic coated multi-nutrient fertilizer at 15 kg ha-1 was the better source for improving the biochemical constituents and antioxidant enzymes of groundnut in calcareous soils.

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Lu, Yung-Hsiang, Yi-Wei Huang, Jia-Jan Lee, and Sheng-Ju Huang. "Evaluation of the Technical Efficiency of Taiwan’s Milkfish Polyculture in Consideration of Differences in Culturing Models and Environments." Fishes 7, no. 5 (August 28, 2022): 224. http://dx.doi.org/10.3390/fishes7050224.

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Taiwan has cultured milkfish for longer than hundreds of years. Given its long and narrow terrain surrounded by sea and location in a subtropical monsoon area, it has developed a unique culture bounded by the Erren River in the south. The Yunjianan area in the north is cold in winter and thus follows the “current year harvest” culturing model. In contrast, the Gaoping area in the south is warmer in winter and follows the “overwinter harvest” culturing model. This paper evaluated the production efficiency by using the stochastic metafrontier production model and the multi-input-multi-output distance function using input from in-person interviews with 100 current year harvest farmers and 70 overwinter harvest farmers from 2017 to 2019. In the first stage, the environmental variables of various regions were internalized into the model to obtain the group technical efficiency (GTE) of different farming models. In the second stage, the common environmental variables were re-internalized to evaluate the metafrontier technical efficiency (MTE) of both culturing modes. In this way, the technical efficiency and production technology of the two different culturing model are reasonably evaluated by taking into account not only the difference between their input and output, but also their environmental difference during their farming periods. The results show that in spite of the environmental difference between th two culturing models, shallower pond, smaller size of fish fry and lower shrimp density should make culturing more technically efficient. When cultured in a common environment, the lower the temperature, the worse the culture efficiency is. It indicated that milkfish are highly sensitive to low temperature. Therefore, the MTE and technical gap rate (TGR) of current year harvest farming are significantly higher than those of overwinter harvest farming. Finally, the regression analysis showed that the younger the farmers were, the lower the average pond age was, the larger the freshwater culture area was, and the greater the experience in fish farming was. Thus, the relatively better the MTE is; the younger the farmers, the higher the education level is and the more years of experience in fish farming they have, thus the relatively better the production technology level is.

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Bouhedma, Sofiane, Yuhang Zheng, and Dennis Hohlfeld. "Simulation and Characterization of a Nonlinear Dual-Frequency Piezoelectric Energy Harvester." Proceedings 2, no. 13 (November 23, 2018): 908. http://dx.doi.org/10.3390/proceedings2130908.

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In this paper, we present a concept, simulation and characterization results of a dual-frequency piezoelectric energy harvester with magnetic frequency tuning capabilities. We demonstrate that the frequency-agile multi-mode capability enables the device to harvest on a wider range of operating frequencies than classical vibration harvesters.

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34

SANI, A., Umar Ibrahim, and S. IBRAHIM. "ANALYSIS OF POST-HARVEST LOSSES AND TECHNICAL EFFICIENCY OF RICE FARMERS IN MIDDLE RIMA VALLEY IRRIGATION SCHEME (MRVIS), SOKOTO STATE, NIGERIA." FUDMA Journal of Agriculture and Agricultural Technology 8, no. 1 (September 15, 2022): 142–50. http://dx.doi.org/10.33003/jaat.2022.0801.033.

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Nigeria has been characterized with shortage quantity in rice production due to inefficiency in the utilization of the available resources and post-harvest losses which account for about 20-25% of total production annually. This study was undertaken to examine the technical efficiency and post-harvest losses of rice farmers in MRVIS. Multi-stage sampling technique was used to sample 98 respondents. Data were collected using questionnaire and then analyzed using descriptive statistics, multiple regression model and Data Envelopment Analysis. The findings show that 73.4% of the farmers were within the age of 30-57. Similarly, farming was a male dominated enterprise with 93.0%. The farmers had a mean of 20 years in rice farming. The estimation of post-harvest losses confirmed that a total of 575kg/ha (8.44%) of total production was lost from harvesting to storage. There was ineffective utilization of production resources as the farmers could not achieve the optimal technical efficiency in rice farming. The regression analysis shows that harvesting, farm size, level of education and farming experience were the determinants of rice post-harvest losses in the area. It was recommended that Government should adequately install modern techniques for rice farming in MRVIS.

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35

Dougherty, Dawn T., Ray Hilborn, André E. Punt, and Ian J. Stewart. "Modeling co-occurring species: a simulation study on the effects of spatial scale for setting management targets." Canadian Journal of Fisheries and Aquatic Sciences 70, no. 1 (January 2013): 49–56. http://dx.doi.org/10.1139/cjfas-2012-0042.

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Many species of marine fish are found in similar habitats and display similar vulnerability to fishing pressure, although their sustainable exploitation rates may differ considerably. Managing and setting harvest limits is challenging for such co-occurring species because the management targets for the less productive species may affect the fishing opportunities for the more productive species. We used simulation modeling to explore the effects of setting multi-species management targets and harvest regulations at local area or coast-wide levels. Setting management targets over the entire coast, and identifying optimal harvest rates within each local area, consistently led to the same or higher yields than setting management targets for each area. Essentially, the global conservation goal can be achieved by protecting areas in which the less productive species is abundant and by taking most of the harvest from other areas. The increases in yield do not increase the coast-wide probabilities of either species being overfished or severely depleted, but do increase these probabilities at the local area level for the less productive species. These results are magnified with increased spatial variation in the ratio of abundance and differences in intrinsic rates of growth among the fished species.

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36

Suryani, Erma, Herwita Idris, Nurmansyah, and Nasril Nasir. "Effect of Harvest Interval on the Productivity of Three Varieties of Citronela Grass Planted on Ultisol Soil." IOP Conference Series: Earth and Environmental Science 1097, no. 1 (October 1, 2022): 012007. http://dx.doi.org/10.1088/1755-1315/1097/1/012007.

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Abstract Indonesia has produced various types of essential oils, one being citronella oil. This essential oil is multi-beneficial not only from its contribution to agricultural development, but is also plays a role in the development of the community’s economy. A large area of agricultural lands of ultisol soil types have not been utilized, therefore a study was conducted on the effect of harvest interval on the productivity of three varieties of citronela grass planted on ultisol soil. This study was conducted from January 2019 to January 2021, with a randomized block design in factorial using two factors. The first factor is harvest interval, with three levels consisting of P1 = a harvest interval of once in 4 months, P2 = a harvest interval of once in 3 months, and P3 = a harvest interval of once in 2 months. While the second factor is variety, with three levels consisting of V1 = Citrona 1 variety, V2 = Citrona 2 variety, and V3 = Serai wangi 1 variety, repeated three times. Each treatment consisted of 24 clumps. The parameters observed were vegetative growth, terna production, oil production, intensity of spot disease attack, and quality analysis R/C ratio. The results of the research on harvest intervals and the three types of varieties used on ultisol soil showed that the best harvest interval was of once every 3 months; while the Serai wangi 1 variety showed good results of vegetative development, had the lowest intensity spot disease attack (24.75 and 19.60%), terna production (68.76 and 59.78 ton –ha-th), and oil production (481.42 and 418.08 kg –ha-th). On another note, oil quality such as Citronella and Graniol content was not affected by harvest interval and the variety used. For the R/C Ratio in the second year of planting, it was revealed that business feasibility was at harvest intervals of once every 3 months with an R/C Ratio of (1.28) on the Serai wangi 1.

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Amusa, Taofeeq Ade, Stanley Chukwudi Anugwo, and Ogechi Lynda Egwue. "Comparative Analysis of the Contributions of Men and Women to Farming Decisions among Rice Producing Households in Ebonyi State, Nigeria." Journal of Agricultural Extension 26, no. 3 (August 8, 2022): 86–97. http://dx.doi.org/10.4314/jae.v26i3.8.

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The study examined the contributions of men and women to farming decisions among rice producing households in Ebonyi State, Nigeria. A multi-stage sampling method was used to select 120 rice producing families. Husband and wife involved in rice production as a unit were interviewed and data were collected using questionnaire. Collected data were analysed with mean, standard deviation, chart and z-test. The result showed that the mean contribution of men in pre-harvest decisions (x̅ =3.54 ± 0.18) was higher than that of women (x̅ =2.43 ± 0.24). On the other hand, the mean contribution of men in decision-making in post-harvest activities (x̅ =2.54 ± 0.48) was relatively low compared to that of women (x̅ =3.47 ± 0.16). There was a significant difference in the level of contributions of men and women to decision-making in pre- and post-harvest activities. Improved commitment to helping farmers gain more access to farm-related information to make informed decisions about their farming business is recommended.

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Yu, Zhiyuan, Muhammad Hafeez, Lihan Liu, Muhammad Tariq Mahmood, and Hong Wu. "Evaluating the Minor Coarse Cereals Product Crowdfunding Platform through Evolutionary Game Analysis." Sustainability 11, no. 5 (March 1, 2019): 1299. http://dx.doi.org/10.3390/su11051299.

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In the modern era, the minor coarse cereals (MCC) are particularly popular among consumers. Price fluctuations cause misperceptions for growers, but also bring about complications for processing enterprises and consumers. To solve this problem, a multi-grain product crowdfunding platform is proposed. To this end, an evolutionary game model is constructed to investigate the game equilibrium between growers and crowdfunders. The analysis determines that evolutionary game equilibrium is related to the relative price difference between the sowing period and the harvest period, and to the social/logistical cost. Under normal circumstances, the crowdfunder may default when the sowing-period price is greater than the harvest-period price. The grower may default if the sowing-period price is less than the harvest-period price. Therefore, in the design of a crowdfunding system for MCC products, a certain percentage of advance payment (30%) and certain default deposits should be collected from crowdfunders and growers, respectively.

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Fue, Kadeghe, Wesley Porter, Edward Barnes, Changying Li, and Glen Rains. "Autonomous Navigation of a Center-Articulated and Hydrostatic Transmission Rover using a Modified Pure Pursuit Algorithm in a Cotton Field." Sensors 20, no. 16 (August 7, 2020): 4412. http://dx.doi.org/10.3390/s20164412.

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This study proposes an algorithm that controls an autonomous, multi-purpose, center-articulated hydrostatic transmission rover to navigate along crop rows. This multi-purpose rover (MPR) is being developed to harvest undefoliated cotton to expand the harvest window to up to 50 days. The rover would harvest cotton in teams by performing several passes as the bolls become ready to harvest. We propose that a small robot could make cotton production more profitable for farmers and more accessible to owners of smaller plots of land who cannot afford large tractors and harvesting equipment. The rover was localized with a low-cost Real-Time Kinematic Global Navigation Satellite System (RTK-GNSS), encoders, and Inertial Measurement Unit (IMU)s for heading. Robot Operating System (ROS)-based software was developed to harness the sensor information, localize the rover, and execute path following controls. To test the localization and modified pure-pursuit path-following controls, first, GNSS waypoints were obtained by manually steering the rover over the rows followed by the rover autonomously driving over the rows. The results showed that the robot achieved a mean absolute error (MAE) of 0.04 m, 0.06 m, and 0.09 m for the first, second and third passes of the experiment, respectively. The robot achieved an MAE of 0.06 m. When turning at the end of the row, the MAE from the RTK-GNSS-generated path was 0.24 m. The turning errors were acceptable for the open field at the end of the row. Errors while driving down the row did damage the plants by moving close to the plants’ stems, and these errors likely would not impede operations designed for the MPR. Therefore, the designed rover and control algorithms are good and can be used for cotton harvesting operations.

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Ndemera, M., S. Landschoot, M. De Boevre, L. K. Nyanga, and S. De Saeger. "Effect of agronomic practices and weather conditions on mycotoxins in maize: a case study of subsistence farming households in Zimbabwe." World Mycotoxin Journal 11, no. 3 (September 18, 2018): 421–36. http://dx.doi.org/10.3920/wmj2017.2227.

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Maize is susceptible to many mycotoxigenic fungi and mycotoxins, being prone to Fusarium spp. infection and subsequent mycotoxin contamination. Fumonisin B1 (FB1) is the predominant mycotoxin in Zimbabwean subsistence-grown maize and results of mycotoxin analyses indicated FB1 to be significantly higher compared to other mycotoxins. To fully elucidate maize agronomic practices influencing FB1 contamination of maize produced by Zimbabwean subsistence farming populations, an investigative field survey was conducted in the selected provinces of Mashonaland West and Manicaland. Agronomic data and associated climatic data were collected during the 2014/2015 agricultural season. A total of 158 maize samples were collected from households’ harvest, three months and six months post-harvest. Analysis and quantification of mycotoxin contamination in the maize samples was performed using a validated multi-mycotoxin analysis method with a scope of 23 mycotoxins. Maize was mainly contaminated by FB1. There was low mycotoxin co-occurrence in Zimbabwean maize, which was typically of Fusarium toxins. FB1 occurred in 23, 47 and 47% of samples at harvest, three and six months post-harvest, respectively. The corresponding means of positive samples were 609, 597 and 289 μg/kg, respectively. Regarding fumonisins, the choice of seed and fertiliser application were significant in modulating FB1 contamination. There was no significant difference in mean FB1 contamination during post-harvest maize storage. Daily temperatures were key factors influencing FB1 incidence and levels. High temperatures were associated with high FB1 contamination particularly at the flowering stage of maize. Rainfall was positively correlated with FB1 contamination. Good agricultural practices attributed to low FB1 contamination in maize pre-harvest. Post-harvest practices such as preserving seed integrity by preventing pest infestation using grain protection chemicals are important in achieving lower mycotoxin contamination and in particular, FB1, in maize grain.

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Rauch, Peter, and Stelian Alexandru Borz. "Reengineering the Romanian Timber Supply Chain from a Process Management Perspective." Croatian journal of forest engineering 41, no. 1 (November 5, 2019): 85–94. http://dx.doi.org/10.5552/crojfe.2020.610.

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Implementation of process management in the forest supply chains has a great potential for organizational and managerial improvement, at least by resource saving. Nevertheless, techniques of process management have been scarcely used to improve the forest supply chains in many parts of the world. In this study, for both Romanian state and private forests, the processes of the timber supply chain – from the harvest site to the forest-based industry plant – are mapped and analyzed. The main objectives of this work were to identify process optimization potentials and to redesign processes in order to improve the performance of the Romanian timber supply chain. Results show that particularly inter-organizational processes offer great saving potentials, mainly due to the existing multi-level hierarchy and multi-level control obligations. Therefore, introducing a web-based platform to enhance a collaborative workflow can considerably decrease the time needed for providing harvest sites or logs to customers via auctions. Further process optimization can be reached by the empowerment of lower level hierarchies facilitating the reduction of hierarchy levels of involved state organizations.

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Higgins, RM, BS Danilowicz, JA Balbuena, AK Daníelsdóttir, AJ Geffen, WG Meijer, J. Modin, et al. "Multi-disciplinary fingerprints reveal the harvest location of cod Gadus morhua in the northeast Atlantic." Marine Ecology Progress Series 404 (April 8, 2010): 197–206. http://dx.doi.org/10.3354/meps08492.

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Granieri, Michael A., Lee C. Zhao, Benjamin N. Breyer, Bryan B. Voelzke, Nima Baradaran, Alexis L. Grucela, Peter Marcello, and Alex J. Vanni. "Multi-Institutional Outcomes of Minimally Invasive Harvest of Rectal Mucosa Graft for Anterior Urethral Reconstruction." Journal of Urology 201, no. 6 (June 2019): 1164–70. http://dx.doi.org/10.1097/ju.0000000000000087.

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Long, Dan S., and John D. McCallum. "On-combine, multi-sensor data collection for post-harvest assessment of environmental stress in wheat." Precision Agriculture 16, no. 5 (March 28, 2015): 492–504. http://dx.doi.org/10.1007/s11119-015-9391-z.

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Widyastuti, Luh Putu Yuni, Willy Bayuardi Suwarno, and Hajrial Aswidinnoor. "Genotype by environment analysis on multi‐canopy cropping system towards vertical harvest space in rice." Agronomy Journal 112, no. 6 (September 23, 2020): 4568–77. http://dx.doi.org/10.1002/agj2.20405.

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Brooks, Elizabeth N. "Using reproductive values to define optimal harvesting for multisite density-dependent populations: example with a marine reserve." Canadian Journal of Fisheries and Aquatic Sciences 59, no. 5 (May 1, 2002): 875–85. http://dx.doi.org/10.1139/f02-058.

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A new method for determining optimal harvest from age-structured populations with a density-dependent stock-recruit relationship is presented. The theoretical optimal harvest comes from removing the age-class with the smallest ratio of reproductive value to weight. The method is derived from considering the sensitivity of equilibrium egg production to harvest using results for density-dependent Leslie matrices. The method holds in both single- and multi-site contexts and is derived for both Ricker and BevertonHolt recruitment functions. I illustrate the method for a one-site model of Arcto-Norwegian cod (Gadus morhua) and obtain the same optimal strategy as previous methods, namely that age-class 6 should be harvested 45%. Including age-specific selectivities, the best constrained yields occur at a harvest rate of 11% on ages 512. This yield is 73% of the theoretical optimum. I considered the same model when a reserve is established and found that high transfer rates out of the reserve (where spawners attain a higher fecundity) produced greater yields that were 86% of the one-site (no reserve) yield. Also, if overfishing occurs at 1.5 and 2.0 times the optimal level in the one-site case, then most yields from the reserve model are greater than those from the one-site model.

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Merganič, Ján, Katarína Merganičová, Jozef Výbošťok, Peter Valent, and Ján Bahýľ. "Impact of interest rates on forest management planning based on multi-criteria decision analysis." Central European Forestry Journal 68, no. 1 (March 1, 2022): 23–35. http://dx.doi.org/10.2478/forj-2021-0019.

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Abstract The fulfilment of forest functions is significantly affected by forest management, especially the applied harvest regeneration systems. The interest rate can significantly influence forest regeneration planning but was rarely tested. We examined how different interest rates (0%, 0.5%, 1%, 1.5%, 2%, 2.5% and 3%) affect the fulfilment of multiple forest functions and hence, the decision on the optimal forest regeneration system for multiple criteria. The analysis was performed based on the simulation of 450 different harvest-regeneration systems applied to a secondary spruce dominated forest stand and the multi-criteria a posteriori decision analysis. The outputs from the growth simulator were used to quantify the fulfilment of timber production and non-production functions. Three selected indicators (Soil expectation value, Shannon index of species diversity, and height to diameter ratio) were analysed on the base of single-criteria optimisation based on maximising a single indicator and the methods of multi-criteria optimisation of the weighted sum method and Pareto front with the goal to harmonise the fulfilment of three different functions. The results indicated that lower interest rates favoured single tree cutting systems with relatively long rotation cycles (140–160 years), while higher interest rates favoured strip cutting with shorter rotation cycles (90–100 years).

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Li, Xiao-Hang, Kun Sheng, Ying-Hong Wang, Yan-Qi Dong, Zhi-Kai Jiang, and Jing-Sheng Sun. "Influence of furrow irrigation regime on the yield and water consumption indicators of winter wheat based on a multi-level fuzzy comprehensive evaluation." Open Life Sciences 17, no. 1 (January 1, 2022): 1094–103. http://dx.doi.org/10.1515/biol-2022-0059.

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Abstract Irrigation regimes should be chosen to maximize crop yield and water use efficiency. To realize high yield and efficient water use with the appropriate furrow irrigation regime, the effects of two regimes (alternate furrow irrigation and conventional furrow irrigation) and three lower soil moisture limits (60, 70, and 80%) were studied on winter wheat yield and water consumption using a multi-level fuzzy comprehensive evaluation method. The results show that under the two regimes, alternate furrow irrigation and conventional furrow irrigation, when the lower limit of the soil moisture is 70%, the harvest index (0.45 and 0.39, respectively) and crop water productivity of winter wheat (1.86 and 1.90 kg m−3, respectively) are highest. The comprehensive fuzzy evaluation model considers multiple measures, including yield, harvest indices, irrigation volume, total water consumption, and crop water productivity – the index values are highest at the 70% condition, which are 0.3468 and 0.3432, respectively. Therefore, it can be concluded that a moderate water deficit is conducive to saving water resources and improving water use efficiency. In conclusion, a multi-level and multi-factor indices system of furrow irrigation regime was constructed based on ensuring winter wheat production. Conventional furrow irrigation is recommended in areas with sufficient irrigation water, while alternating furrow irrigation, which can reduce the total amount of irrigation required, is suitable for areas with water shortages.

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Dieye, Mor, Nafissatou Diop Ndiaye, Joseph Bassama, Christian Mertz, Christophe Bugaud, Paterne Diatta, and Mady Cissé. "Storage Time as an Index for Varietal Prediction of Mango Ripening: A Systemic Approach Validated on Five Senegalese Varieties." Foods 11, no. 23 (November 22, 2022): 3759. http://dx.doi.org/10.3390/foods11233759.

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Mangifera indica species presents a wide varietal diversity in terms of fruit size and morphology and also of physicochemical and organoleptic properties of the pulp. In Senegal, in addition to the well-known export varieties, such as ‘Kent’, local varieties have been little studied particularly during ripening. This study aims to propose prediction models integrating variables deduced from varietal characteristics. Five mango varieties (‘Diourou’, ‘Papaye’, ‘Sierraleone’, ‘Boukodiekhal’ and ‘Sewe’) endemic to Senegal were characterized at harvest and followed during ripening storage. Caliber parameters were determined at green-mature stage as well as storage (25 °C) weight losses. Considering the ‘ripening storage time’ (RST) variable as ripeness level index, intra-varietal prediction models were built by multi-linear regression (R2 = 0.98) using pulp pH, soluble solid content (SSC) and Hue angle. In addition to these physicochemical parameters, variety-specific size, shape and weight loss parameters, were additional variables in multi-linear models (R2 = 0.97) for multi-varietal prediction of RST. Results showed that storage time, which was the most influential factor on the pH, SSC and Hue, can be used as a response for varietal prediction of mango ripening. As a decision support tool, theses statistical models, validated on two seasons, will contribute to reduce post-harvest losses and enhance mango value chain through a better ripening process monitoring.

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Alharbi, Fahad M. "The General Analytic Expression of a Harvested Logistic Model with Slowly Varying Coefficients." Axioms 11, no. 11 (October 24, 2022): 585. http://dx.doi.org/10.3390/axioms11110585.

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The harvested logistic model with a slow variation in coefficients has been considered. Two cases, which depend on the harvest rate, were identified. The first one is when the harvest is subcritical, where the population evolves to an equilibrium. The other is supercritical harvesting, where the population decreases to zero at finite times. The single analytic approximate expression, which is capable of describing both harvesting cases, is readily and explicitly obtained using the multi-time scaling method together with the perturbation approach. This solution fits for a wide range of coefficient values. In addition, such an expression is validated by utilizing numerical computations, which are obtained by using the fourth-order Runge–Kutta technique. Finally, the comparison shows a very good agreement between the two methods.

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