Bibliographies thématiques / Terai soils

Littérature scientifique sur le sujet « Terai soils »

Auteur : Grafiati

Publié le 18 mai 2024

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Articles de revues sur le sujet "Terai soils"

Koirala, M. P., et G. Ojha. « Foundation characteristics of the soils of different parts of Nepal ». Journal of Nepal Geological Society 42 (24 septembre 2011) : 153–81. http://dx.doi.org/10.3126/jngs.v42i0.31462.

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This paper deals with foundation characteristics of the soils of different parts of Nepal. In this paper, multiple approaches were adopted to explore foundation characteristic s of the soil. In this study 14 sites from different parts of the country were selected; 2 sites from the hilly region, 2 sites from the inner Terai and 10 sites from the Terai. In each site two test sites were selected. In each test site simplified penetration apparatus (SPA) tests were carried out and were accompanied by the auger tests. Soil samples from different depths in each site were collected for the direct shear test, soil classification, LL PL test, density and other tests and these tests were carried out in laboratory. Bearing capacity of the soils thus obtained from the laboratory was compared with the soil types of certain depth and the Nc value at that depth. From the study it was found that the Nc value depends upon the types of the soil and the compactness of the soils. This study showed that Nc value can be converted in to the ultimate bearing capacity by multiplying the obtained Nc value by the factor of 35 within 80% confidence. Resistivity measurements were carried out only to explore the suitability of the sites for the purposed construction of substations in terms of earthing. Resistivity measurement showed that the sites are suitable for the construction of purposed substations.

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Ojha, Roshan Babu, Shova Shrestha, Yajna Gajadhar Khadka et Dinesh Panday. « Potassium nutrient response in the rice-wheat cropping system in different agro-ecozones of Nepal ». PLOS ONE 16, n^o 3 (18 mars 2021) : e0248837. http://dx.doi.org/10.1371/journal.pone.0248837.

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Most of the soils of Nepal had a higher potassium (K, expressed as K2O) level inherently. Later in 1976, the Government of Nepal has recommended K fertilizer rate at 30 kg K2O ha-1 in rice-wheat cropping systems. However, those crops began showing K deficiency symptoms in recent decades, which could be due to a large portion of soils with depleted K level or the insufficient input of K fertilizer for crop production. This study explored a limitation of K nutrient in the crops by establishing field trials from 2009–2014 at three agro-ecozones i.e., inner-Terai (2009–2010), high-Hills (2011–2012), and Terai (2012–2014) in Nepal. Seven rates of K fertilizer at 0, 15, 30, 45, 60, 75, and 90 kg K2O ha-1 were replicated four times in a randomized complete block design, where crop yields and yield-attributing parameters of rice-wheat cropping system were recorded. Results revealed that an increase in K rates from 45 to 75 kg K2O ha-1 under inner-Terai and Terai conditions and 45 to 60 kg ha-1 under high-Hills conditions produced significantly higher grain yields compared to the recommended K dose. Economically, the optimum rate of K fertilizer should not exceed 68 kg K2O ha-1 for rice in all agro-ecozones, or 73 kg K2O ha-1 for wheat in inner-Terai and 60 kg K2O ha-1 for wheat in high-Hills and Terai. Our findings suggest to increase potassium application in between 1.5 to 2.5 times of the current K fertilizer rate in rice-wheat cropping system of Nepal that need to be tested further in different locations and crop varieties.

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De, Parijat, Shovik Deb, Dibyendu Deb, Somsubhra Chakraborty, Priyabrata Santra, Puspendu Dutta, Anarul Hoque et Ashok Choudhury. « Soil quality under different land uses in eastern India : Evaluation by using soil indicators and quality index ». PLOS ONE 17, n^o 9 (22 septembre 2022) : e0275062. http://dx.doi.org/10.1371/journal.pone.0275062.

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Indian soils are inherently poor in quality due to the warm climate and erosion. Conversion of land uses like forests to croplands and faulty management practices in croplands further cause soil degradation. This study aimed to understand the extent of these impacts in a small representative part of eastern India, covering Himalayan terai and nearing alluvial plains. Soils were collected from (i) forests, (ii) croplands (under agricultural practices for more than 50–60 years) and (iii) converted lands (converted from forests to croplands or tea gardens over the past 15–20 years). Different soil quality indicators were assessed and soil quality index (SQI) was generated to integrate, scale and allot a single value per soil. Results indicated that continuous organic matter deposition and no disturbances consequence the highest presence of soil carbon pools, greater aggregation and maximum microbial dynamics in forest soils whereas high application of straight fertilizers caused the highest available nitrogen and phosphorus in cropland soils. The SQI scorebook indicated the best soil quality under forests (x¯ 0.532), followed by soils of converted land (x¯ 0.432) and cropland (x¯ 0.301). Comparison of the SQI spatial distribution with land use and land cover confirmed the outcome. Possibly practices like excessive tillage, high cropping intensity, no legume in crop rotations, cultivation of heavy feeder crops caused degraded soil quality in croplands. This study presented an example of soil quality degradation in India due to land use change and faulty management practices. Such soil degradation on a larger scale may affect future food security.

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PAL, D., P. K. PATRA et D. MUKHOPADHYAY. « Characterizing soils under different land use patterns in Terai region of West Bengal ». AN ASIAN JOURNAL OF SOIL SCIENCE 10, n^o 1 (15 juin 2015) : 142–48. http://dx.doi.org/10.15740/has/ajss/10.1/142-148.

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Singh, N. K., G. C. Banik, D. Mukhopadhyay et A. Patra. « Release of non-exchangeable potassium in some acidic Terai soils of himalayan floodplain ». Journal of the Indian Society of Soil Science 68, n^o 3 (2020) : 307–14. http://dx.doi.org/10.5958/0974-0228.2021.00007.4.

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Magar, Lil Budha, Binod Rayamajhee, Sujan Khadka, Gaurab Karki, Alina Thapa, Muhammad Yasir, Sandeep Thapa, Om Prakash Panta, Suprina Sharma et Pramod Poudel. « Detection of Bacillus Species with Arsenic Resistance and Plant Growth Promoting Efficacy from Agricultural Soils of Nepal ». Scientifica 2022 (19 juillet 2022) : 1–10. http://dx.doi.org/10.1155/2022/9675041.

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Arsenic contamination in soil and water is one of the major environmental problems in multiple countries including Nepal imposing a serious threat to the ecosystem and public health. Many soil bacteria can detoxify arsenic, including genus Bacillus. With an objective to gauge the plant growth-promoting activities of arsenic-resistant Bacillus species, 36 samples (soil, rice, cauliflower, and beans) were collected from the Terai region of Nepal. For selective isolation of Bacillus species, each sample was heated at 80°C for 15 min before the inoculation into nutrient agar (NA). Following the standard protocol, arsenic-resistant Bacillus species were screened using NA supplemented with 100 ppm sodium arsenate and sodium arsenite. Among 158 randomly selected isolates, only five isolates were able to tolerate sodium arsenite concentration up to 600 ppm. Notably, all five isolates were able to produce indole acetic acid (IAA), a plant hormone, and solubilize phosphate. Based on biochemical analysis and 16S rRNA gene sequencing, isolates N4-1, RW, KR7-12, Bhw1-4, and BW2-2 were identified as B. subtilis subsp. stercosis, B. flexus, B. licheniformis, B. cereus, and B. flexus, respectively. To the best of our knowledge, this is the first study showing the presence of arsenic-resistant B. flexus in Nepalese soil with plant growth-promoting traits. Possible utilization of these Bacillus strains could facilitate the novel bioremediation pathway to reduce the toxic effect of arsenic from the soil and water in the Terai region of Nepal.

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Dhakal, M., Shrawan K. Sah, Andrew McDonald et Anant P. Regmi. « Perception and economics of dry direct seeded rice in tarai of Nepal ». Journal of Agriculture and Environment 16 (1 juin 2015) : 103–11. http://dx.doi.org/10.3126/aej.v16i0.19843.

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Transplanting is widely practiced methods of rice establishment in puddled soils require large amount of labor and water, which are becoming scarce and expensive in Nepal. A field survey was carried out in six districts of terai region of Nepal during 2010. Sixty farmers, ten from each district were randomly selected. They were interviewed using face-to-face method based on semi-structured questionnaires to know their perception towards constraints, and economics of dry direct seeded rice (DDSR). Farmers were mostly using transplanted rice (TPR) because of less weed infestation and better crop establishment, but they were concerned with high cost of cultivation, higher water requirement and deterioration of soil after puddling operation. Farmers perceived DDSR as a cost reducing and less water requiring technology whereas severe weed infestation, poor crop establishment and reduced grain and straw yield were the major nuisance. Nevertheless, the B:C ratio of DDSR (2.0) was found higher than TPR (1.63). Therefore, DDSR could be an alternative to TPR in reducing cost of cultivation; however weeds are serious problems.

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Khadka, Dinesh, Rita Amgain, Sushila Joshi et Shankar Shrestha. « Evaluation of distilled water pH measurement with electrolyte methods in cultivated soils of Nepal ». Agrochemistry and Soil Science, n^o 92 (décembre 2021) : 52–61. http://dx.doi.org/10.31073/acss92-06.

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Soil pH is most routinely measured parameter among all others in soil chemistry laboratory. There are various methods developed for pH measurement, although we using only distilled water from the beginning. In Nepal, there do not have database for showing performance of the methods. The three methods namely; H2O, KCl and CaCl2 with their soil:solution ratios (1:1, 1:2 and 1:2.5) were used. The total 115 samples were collected randomly at a depth of 0-20 cm from the hill and terai regions of Nepal. The collected samples were analyzed following mentioned methods, separately. The various statistical tests (F-test, mean separation, correlation, and regression model) were performed for comparison. Moreover, model validation parameters were also calculated for relating H2O with electrolyte method. The three models linear, quadratic and cubic were used for this task. The result revealed the effect of methods on pH measurement was significantly different in the entire ratio. The pHH2O was 0.57, 0.56 and 0.67 units higher than pHCaCl2 in 1:1, 1:2 and 1:2.5 ratios, respectively. Whereas, 1.24, 0.99 and 0.95 units higher than pHKCl in respective ratio. Moreover, regarding timing to reach stable during measurement were in the order pHH2O (89.44 sec) > pHCaCl2 (54.29 sec) > pHKCl (33.08 sec). Similarly, relating modeling quadratic and cubic model showed nearly equal performance (lower RMSE, MAE and higher R2 and d) for predicting pHCaCl2 and pHKCl from the pHH2O in each soil solution ratio. The determined database can be useful for comparing used three different methods of soil pH measurement under Nepalese context.

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Basnet, Roshan, Sundar Man Shrestha, Deepak Bandari, Hira Kaji Manandhar et Dhruba Bahadur Thapa. « Evaluation of wheat (Triticum aestivum L.) genotypes for spot blotch (Bipolaris sorokiniana Sacc) resistance in terai condition of Nepal ». Archives of Agriculture and Environmental Science 7, n^o 3 (25 septembre 2022) : 440–49. http://dx.doi.org/10.26832/24566632.2022.0703019.

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Spot blotch caused by Bipolaris sorokiniana is a major disease of wheat in warm and humid regions of Nepal. The fungus has a worldwide distribution but as a pathogen, it is the most aggressive under the conditions of high relative humidity and temperature associated with the low fertility of soils in Nepal. The yield loss due to the disease is very significant in Nepal. This experiment was conducted to identify the genotypes having a good level of resistance against spot blotch. The experiment set was received from CIMMYT comprises 52 genotypes and arranged in alpha lattice design with two replications in 2017/18 at National Wheat Research Program, Bhairahawa, Nepal, and Regional Agricultural Research Station, Parwanipur, Bara, Nepal. Each plot size was 8 rows of 2 meters long. Three times disease scoring was done in the double-digit method and calculated the Area under the disease progress curve (AUDPC). Other data were analyzed by using R software (4.2.2). Heading days, days to maturity, plant height, number of grains per spike (NGPS), number of tillers per meter square (NTPM), mean AUDPC, thousand-grain weight (TGW), and grain yield were found highly significant. The genotype 8HLBSN47 was found the highest yielder (4996kg/ha) with a 304 mean AUDPC value. Seventeen genotypes (15.3%) found the lowest mean AUDPC, Penultimate leaf AUDPC, Flag leaf AUDPC, and the highest number of tillers per square meter, number of grains per spike, thousand-grain weight, and grain yield.

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Basnet, Roshan, Sundar Man Shrestha et Deepak Bandari. « Performance of Wheat (Triticum aestivum L.) Genotypes for Spot Blotch (Bipolaris sorokiniana Sacc.) Resistance in Terai Condition of Nepal ». International Journal of Research and Review 9, n^o 8 (5 septembre 2022) : 894–906. http://dx.doi.org/10.52403/ijrr.20220879.

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Spot blotch caused by Bipolaris sorokiniana is a major disease of wheat in warm and humid regions of Nepal. The fungus has a worldwide distribution but as a pathogen, it is the most aggressive under the conditions of high relative humidity and temperature associated with the low fertility of soils in Nepal. The yield loss due to the disease is very significant in Nepal. This experiment was conducted to identify the genotypes having a good level of resistance against spot blotch. The experiment set was received from CIMMYT comprises 52 entries and arranged in alpha lattice design with two replications in 2017/18 at National Wheat Research Program, Bhairahawa, Nepal, and Regional Agricultural Research Station, Parwanipur, Bara, Nepal. Each plot size was 8 rows of 2 meters long. Three times disease scoring was done in the double-digit method and calculated the Area under the disease progress curve (AUDPC). Other data were analyzed by using R software (4.2.2). Heading days, days to maturity, plant height, number of grains per spike (NGPS), number of tillers per meter square (NTPM), mean AUDPC, thousand-grain weight (TGW), and grain yield were found highly significant. The genotype 8HLBSN47 was found the highest yielder (4996kg/ha) with a 304 mean AUDPC value. Seventeen genotypes (15.3%) found the lowest mean AUDPC, Penultimate leaf AUDPC, Flag leaf AUDPC, and the highest number of tillers per square meter, number of grains per spike, thousand-grain weight, and grain yield. Keywords: AUDPC, spot blotch, genotypes, HLBSN

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Thèses sur le sujet "Terai soils"

Mondal, Goutam Kumar. « Characterisation of availability and sorption behaviour of phosphorus in Terai soils of West Bengal ». Thesis, University of North Bengal, 2002. http://hdl.handle.net/123456789/744.

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Dey, Pannalal. « Search for agriculturally important microorganisms from soils of river basins, forests and crop fields in the terai-dooars of North Bengal and analysis of their diversity ». Thesis, University of North Bengal, 2011. http://hdl.handle.net/123456789/1423.

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Pandey, Surya Prasad. « Opportunities for soil organic matter and nutrient management in the rice-wheat system of the Nepal Terai ». Thesis, University of Nottingham, 2002. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.275943.

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Adawi, Rahim. « Preventing fatal effects of overworking : Product design solution ». Thesis, Högskolan i Skövde, Institutionen för ingenjörsvetenskap, 2018. http://urn.kb.se/resolve?urn=urn:nbn:se:his:diva-15473.

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“Overworking to death” is a phenomenon that has been noticeable in developing countries. The cause of death is mainly through ischemic strokes. While the victims’ occupations differed, they all shared a common characteristic, being positioned in a sedentary work, ranging from IT workers to doctors. This project’s aim was to develop a product that prevented or decreased the strokes that derived from sedentary overwork. This was mainly tackled by preventing one of the three causes of developing blood props, slowed blood flow. In order to gather rich data of the phenomenon, a qualitative study was conducted in China, during two months. By doing an extensive structured sampling, information rich data could be gathered during a short period of time. Data were derived from observations, questionnaires and an interview, which then was interpreted to customer needs and the final product specification. The final product became a trouser with an in built dynamic compression mechanic, that can compress the veins mostly during sitting activities, in order to prevent blood stasis. The compression mechanic works like the Chinese finger trap; compressing the calves while sitting and stretching the legs forward. It is made only out of polysaccharides fibres; cotton and corn.
"Guolaosi" eller död från överarbete är ett fenomen som i regel uppkommer bland utvecklingsländer. Dödsorsaken är huvudsakligen genom stroke. Offrens yrken varierar allt från professorer, IT-arbetare till läkare. De delar dock en sak gemensamt; att arbeta under långa perioder stillasittande. Projektets mål var att utveckla en produkt som minskar dödliga följderna av sedentära överarbete, genom att förebygga en av de tre orsakerna för att utveckla blodproppar; saktad blodström. Målgruppen var då kineser av de yrken som hade tidigare drabbats av fenomenet. För att samla informationsrika data om fenomenet genomfördes en kvalitativ studie i Kina under två månader. Genom att göra en omfattande strukturerad provtagning kunde informationsrika data samlas under en kort tidsperiod. Fältstudien bestod av observationer, frågeformulär och en intervju, som då tolkades till kundbehov och eventuellt produktspecifikationen. Den slutliga produkten kom att bli ett par byxor med en inbyggd dynamisk komprimeringsmekanism, som kan komprimera venerna under sittande aktiviteter, för att förhindra saktad blodström. Kompressionsmekanismen fungerar som den kinesiska fingerfällan. Den komprimerar blodkärlen medan personen sitter och sträcker benen framåt. Produkten är konstruerad på så sätt att den kan tillverkas endast av polysackariders tråd, från bomull och majs. Vilket är lämpligt för Kinas lokala resurser.

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Chapitres de livres sur le sujet "Terai soils"

Jaeggi, David, Paul Bossart et Christophe Nussbaum. « The Rock Mechanical Behavior of Opalinus Clay – 20 Years of Experience in the Mont Terri Rock Laboratory ». Dans Advances in Laboratory Testing and Modelling of Soils and Shales (ATMSS), 351–56. Cham : Springer International Publishing, 2017. http://dx.doi.org/10.1007/978-3-319-52773-4_41.

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Sah, S. P., C. K. Sharma et F. Sehested. « Possible role of the soil in the Sissoo forest (Dalbergia sissoo, Roxb.) decline in the Nepal terai ». Dans Plant Nutrition, 930–31. Dordrecht : Springer Netherlands, 2001. http://dx.doi.org/10.1007/0-306-47624-x_453.

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Thorn, Jessica P. R. « Indigenous and Scientific Knowledge of Soil Regulation Services, and Factors Effecting Decision-Making in Agricultural Landscapes in the Terai Plains of Nepal ». Dans Innovations and Interdisciplinary Solutions for Underserved Areas, 33–51. Cham : Springer International Publishing, 2020. http://dx.doi.org/10.1007/978-3-030-51051-0_3.

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Desmond, Ray. « The Himalayas ». Dans The European Discovery of the Indian Flora, 123–53. Oxford University PressOxford, 1992. http://dx.doi.org/10.1093/oso/9780198546849.003.0011.

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Abstract While apathy or, at best, subdued activity prevailed in botanical circles in western India, the Himalayas beckoned the adventurous and the curious, among them surveyors and scientists who observed in a casual note or expansive report the indigenous plant and animal life of this complex mountain range which separates India from Central Asia, extending from Afghanistan for 1700 miles to Assam in the East, and continues into China. A diversity of soils and climates, especially the summer monsoons, support what the plant collector, Frank Kingdon Ward succinctly described as an ‘immense reservoir of hardy plants’. A fertile jungle strip, ten to twenty miles wide-the terai-which skirts its eastern ranges is home to slender evergreens such as the sal (Shorea robusta) and tall bamboos. The abundant sal yields to conifers and oaks in a gradual ascent of four or five vertical miles through a progression of rain forest, temperate vegetation, conifers, and rhododendrons to the alpine zone above the tree-line at about 10 000 feet. Everywhere plants have adapted to their environment, a delicate ecological balance which man’s intervention through cultivation, grazing and logging is swiftly destroying with consequent erosion and lowland flooding. The phytogeographical variations range between the arid zones of the Hindu Kush and the warmer, wetter regions of the east, with Kashmir, Nepal, and Sikkim offering bumper harvests for botanist and plant collector.

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