Yadav, Rajendra KumarMEENA, SUNIL KUMAR2021-12-072021-12-072021-09-13https://krishikosh.egranth.ac.in/handle/1/5810178730EFFECT OF IRRIGATION SCHEDULES AND SOIL AMENDMENTS ON SOIL PHYSICAL CONSTRAINTS, WATER PRODUCTIVITY AND YIELD OF SOYBEAN UNDER VERTISOLS OF SOUTH-EASTERN RAJASTHANA field experiment was conducted during Kharif season of 2020 at Instructional Farm, Agricultural Research Station, Ummedganj, Kota (Rajasthan) to study the “Effect of Irrigation Schedules and Soil Amendments on Soil Physical Constraints, Water Productivity and Yield of Soybean under Vertisols of South-Eastern Rajasthan”. The experiment was laid out according to Strip Plot Design with three replications. The treatments consisting of three levels of irrigation schedules (0.6, 0.8 and 1.0 IW/CPE ratios) and three soil amendments (Mustered straw, wheat straw and Compost @ 5 t ha-1) were applied to the soybean var. JS20-34 as soil application with uniform application of nitrogen, phosphorus and potassium as per recommended doses. The main findings of investigation are summarized as: The increasing levels of irrigation schedules increased the plant height, dry matter accumulation, number of nodules per plant, number of pods per plant, number of seeds per pod, test weight, seed yield, straw yield and biological yield as well as content and uptake of nitrogen, phosphorus and potassium in seed and straw and gross, net returns and B: C ratio as compared to control. The pH, electrical conductivity, organic carbon, bulk density, particle density, water use efficiency, total applied water and geometric mean diameter was found to be non-significant at harvest stage of crop and available nitrogen (N), phosphorus (P2O5), potassium (K2O) and micronutrients (Zn, Fe, Mn and Cu) content, aggregate stability, Mean weight diameter, water stability aggregate and labile fractions of carbon of soil at harvest stage of crop was increased and soil crack volume decrease significantly with increasing levels of irrigations schedules.The application of soil amendments increased significantly the plant height, dry matter accumulation, number of nodules per plant, number of pods per plant, number of seeds per pod, test weight, seed yield, straw yield and biological yield as well as content and uptake of nitrogen, phosphorus and potassium in seed and straw and gross, net returns and B: C ratio as compared to control. The application of soil amendments enhanced the available nitrogen (N), phosphorus (P2O5), potassium (K2O) and micronutrients (Zn, Fe, Mn and Cu), aggregate stability, Mean weight diameter, water stability aggregate and labile fractions of carbon and decrease soil crack volume. Whereas, the pH, electrical conductivity, organic carbon, bulk density, particle density, water use efficiency and total applied water was found to be non-significant at harvest stage of crop. The significantly highest seed yield, gross returns, net returns and B: C ratio was observed under the treatment I3 (Irrigation schedules @ 1.0 IW/CPE ratio) and S3 (Compost @ 5 t ha-1), respectively. However, the increase was significant upto I1 (Irrigation schedules @ 0.6 IW/CPE ratio) and S2 (mustered straw @ 5 t ha-1) which was also found to be statistically at par with I2 (Irrigation schedules @ 0.8 IW/CPE ratio) and S1 (wheat straw @ 5 t ha-1), respectively. Therefore, in this tract for soybean variety JS20-34, the application of irrigation schedules @ 1.0 IW/CPE ratios with compost @ @ 5 t ha-1 as a most profitable dose is being recommended for higher seed yield and net returns per hectare in Vertisols of South-Eastern RajasthanEnglishThesis