Influence of Different Rice Establishment Methods and Irrigation Regimes on Soil Properties of AnInceptisol Under Sub-Tropical Conditions
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Date
2024-02-16
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Sher-e-Kashmir University of Agricultural Sciences & Technology of Jammu
Abstract
A field experiment was conducted at Research Farm, Agrometeorological section, Division of Agronomy, SKUAST-J, Chatha during kharif 2022. The soil of the experimental field was sandy loam and was found to be low in organic carbon, available nitrogen, while medium in phosphorous, potassium and sulphur content before laying out the experiment. The experiment was laid out in split plot design with four replications consisted of three treatments of rice establishment methods in the main plots: E1=Conventional method, E2=Direct seeded rice, E3=System of rice intensification and in sub plots, the following three treatment combinations of rice establishment and irrigation regimes were applied: I1 (7 cm (Conventional and DSR) / 3 cm (SRI), irrigation depth at 8 days interval during non-rainy period+ half of the recommended dose of NPK through FYM before sowing/puddling), I2 (alternate wetting and drying at 4 cm irrigation depth + half of the recommended dose of NPK, through vermicompost before sowing/puddling) and I3 (alternate wetting and drying at 4 cm irrigation depth +half of the recommended NPK, through FYM before sowing/puddling). The variety used was Basmati-123. The results revealed that conventional method recorded significant higher grain yield and yield attributes like no. of effective panicles/m2, no. of grains /panicle, 1000-grain weight, grain yield, straw yield and harvest index. However, water productivity was higher in SRI plots as compared to conventional and direct seeded rice method but was at par with both the latter methods. The results revealed that, the E2 (DSR) with I1 (7 cm irrigation depth at 8 days interval during non-rainy period +half of the recommended dose of NPK through FYM) treatment improved soil physical properties (bulk density, porosity, water stable aggregates, water holding capacity, field capacity). In terms of chemical properties (pH, EC, OC, N, P, K, S, Zn, Fe, Mn), E1 (conventional method) with I2 (alternate wetting and drying at 4 cm irrigation depth + half of the recommended dose of NPK, through vermicompost) improved soil fertility status of soil. The study also revealed that higher benefit cost ratio of 2.13 was recorded under conventional method. Among the different irrigation regimes, I1 (irrigation at 7 cm depth with half dose of NPK +half dose of FYM) recorded higher benefit-cost ratio of 2.06.
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. Sharma. S.2024.Influence of Different Rice Establishment Methods and Irrigation Regimes on Soil Properties of An Inceptisol Under Sub-Tropical ConditionsM.Sc. Thesis, Sher-e-Kashmir University of Agricultural Sciences and Technology, Jammu.