Person: Jat, R.K.
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Jat
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R.K.
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Jat, R.K.
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- Long-term conservation agriculture-based practices impact crop yields, returns and yield stability in rice-wheat rotations in eastern Indo-Gangetic Plains of India(TAFSSA, 2023) Jat, R.K.; Kumar, S.; Choudhary, K.M.; Kumar, M.; Yadvinder-Singh; Bijarniya, D.; Kalvania, K.C.; Dharamvir Singh Rana; Laing, Alison; Krupnik, T.J.; Jat, M.L.; Gathala, M.K.
Publication - The optimization of conservation agriculture practices requires attention to location-specific performance: Evidence from large scale gridded simulations across South Asia(Elsevier, 2022) Tianning Zhang; Wei Xiong; Sapkota, T.; Jat, M.L.; Montes, C.; Krupnik, T.J.; Jat, R.K.; Karki, S.; Nayak, H.S.; Faisal, A.; Jat, H.S.
Publication - Weed germinable seedbanks of rice–wheat systems in the Eastern Indo-Gangetic Plains: do tillage and edaphic factors explain community variation?(Wiley, 2021) Lowry, C.J.; Brainard, D.C.; Kumar, V.; Smith, R.G.; Singh, M.; Kumar, Pankaj; Kumar, A.; Kumar, V.; Rajiv K. Joon; Jat, R.K.; Poonia, S. P.; Malik, R.; Mcdonald, A.
Publication - Impact of conservation agriculture on soil physical properties in rice-wheat system of eastern indo-gangetic plains(Elewa BioSciences, 2018) Kumar, V.; Kumar, M.; Singh, S.K.; Jat, R.K.Soils of Indo-Gangetic plains (IGP) of India are prone to physical degradation due to their low organic matter content, and presence of carbonates, gypsum or other soluble salts. To address these challenges, conservation agriculture (CA) based crop management practices are being developed. Our objective was to study how CA practices affected soil physical indicators under rice-wheat cropping system. The experiment was carried out in long term ongoing experiment during 2013 (Rice) and 2013-2014 (Wheat) at crop research centre of Dr. Rajendra Prasad Central Agricultural University, India with the aim to compare the impact of conservation agriculture practices on some selected soil physical properties including the soil moisture, soil temperature and root growth of rice and wheat. The experiment was laid out in Randomized Block Design, with seven treatments and three replications. The treatments involved seven combinations of tillage, crop establishment and residue management practices in a rice-wheat rotation-puddled transplanted rice-conventional tillage wheat (T1: PTR-CTW); zero tillage rice-zero tillage wheat on beds having 50% rice residue retained in wheat cycle and 25% wheat residues retained in rice cycle (T2: PBZTR-ZTW +RB); zero tillage rice-conventional tillage wheat without residues (T3: ZTR-CTW-R); zero tillage rice-zero tillage wheat without residues (T4: ZTR-ZTW-R); zero tillage rice-zero tillage wheat having 50% rice residue retained in wheat cycle and 25% wheat residues retained in rice cycle (T5: ZTR-ZTW +RB); unpuddled transplanted rice-zero tillage wheat with 25% rice residues retained in wheat cycle (T6: PuTR-ZTW +RR); zero tillage rice with Sesbania aculeata brown manure-zero tillage wheat without residues (T7: ZTRBM-ZTW-R). The observations were made in one cycle of rice-wheat cropping after 7-years at three stages i.e., before rice sowing/transplanting, after rice harvest and after wheat harvest. Results revealed that CA practices, zero tillage (ZT) with or without residues retention significantly improved the soil moisture content (SMC) and modified the soil temperature (ST) before and after irrigation in both the cropping (P ? 0.05). ZT with or without residues retention significantly reduced the soil bulk density (BD), and improved the air filled porosity (AFP), aggregation (M WD), water holding capacity (WHC), hydraulic conductivity (Kfs) and matric flux potential (?m) (P ? 0.05). Better soil conditions significantly improved root growth of both the crops under CA practices (P ? 0.05). The most favourable impact on soil physical properties was observed due to ZT with brown manuring. A positive Polynomial relationship was obtained between soil BD and MWD, WHC and MWD, and Kfs and ?m at all the three stages. Thus, the evaluation of long term CA practices is potentially recommended to different agro-ecologies for their large scale adoption in the north eastern IGP.
Publication - Predicting yield and stability analysis of wheat under different crop management systems across agro-ecosystems in India(Scientific Research Publishing Inc., 2017) Jat, M.L.; Jat, R.K.; Singh, P.; Jat, S.L.; Sidhu, H.S.; Jat, H.S.; Bijarniya, D.; Parihar, C.M.; Gupta, R.K.The objectives of the study were as follows: 1) to evaluate the GxExM for wheat genotypes; 2) to predict yield performance and identify high stable wheat genotypes in different management practices; and 3) to make genotype-specific management and high performing genotype recommendations within and across agro-ecological regions. A diverse set of twenty-one genotypes was evaluated over three years (2012, 2013 and 2014) under two levels of crop management practices (CT and ZT) across three agro-ecological regions (BR, MP and PB) of India in replicated trials. Data were analyzed with SASGxE and RGxE programs using SAS and R programming languages, respectively. Across and within a location(s), the pattern of GxExM and GxMxY interactions (respectively) among univariate and multivariate stability statistics, grouping of genotypes in divisive clusters and estimates (with a prediction interval) of genotype varied in management practice CT and ZT. Across locations, the genotypes “Munal” and “HD-2967” were the best performers and high stable in CT and ZT, respectively. Genotypes “HD-2824” and “DPW-621-50”, and “Munal” may serve as diverse parents for developing high quality, climate smart, locally adapted genotypes for BR in CT and ZT, respectively. Genotypes “HD-2932”, “BAZ” and “JW-3288”, and “GW-322” and “HD-2967” are suitable for developing locally adapted stress tolerant genotypes for MP in management practices CT and ZT, respectively. Relatively small GxM and GxExM interactions in PB preclude in making definitive conclusions.
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