Bhaskar, SATHEEKUR REHAMAN, H.M2017-08-222017-08-222015-11-16Th-11275http://krishikosh.egranth.ac.in/handle/1/5810029341The three field experiments (one each in kharif 2007 & 2008 and two each in summer 2008 & 2011) were conducted at Zonal Agricultural Research Station, V.C. Farm, Mandya to study the effect of spent wash on rice under different methods of cultivation. The first experiment had two methods of cultivation, three levels of nitrogen and three split applications laid out in split-split plot design and replicated thrice. Results revealed that SRI method recorded significantly higher grain and straw yield (51.66 & 58.35 q ha-1, respectively) was better than conventional method (42.77 & 50.24 q ha-1, respectively). Among levels of nitrogen, N through chemical fertilizer recorded significantly higher grain and straw yield of 50.12 and 57.86 q ha-1 compared to 60 per cent N basal application through spent wash. The difference between split applications of nitrogen was not significant. The second experiment on aerobic rice had four sources (Chemical fertilizers, Farm yard manure, bio compost and spent wash) and 2 levels (Rec. N & 1.5 Rec. N) of nitrogen laid out in factorial RCBD design with 3 replications. Application of 1.5 Rec. N through spent wash recorded significantly higher grain and straw yield (56.2 and 64.5 q ha-1, respectively). However, it was on par with Recommended N through spent wash and Recommended N and 1.5 Recommended N through chemical fertilizers. The third experiment on aerobic rice had 3 levels of basal application of N through spent wash (40, 50 & 60 %) and 3 irrigation schedules (1.25, 1.50 and 1.75 IW/CPE ratio). The results revealed that irrigation at IW/CPE ratio 1.75 and 60 per cent N as basal recorded significantly higher seed (50.15 q ha-1) and straw yield (56.89 q ha-1). Nutrient uptake, soil nutrient status, enzyme activity and economics followed the same trend.ennullThesis