A field experiment was conducted under late planted lowland situations during wet seasons of 2012 and 2013 at Jorhat to evaluate the performance of 3 late planted sali (kharif) rice varieties (Prafulla, Gitesh and Monoharsali) under 3 planting dates (10, 20 and 30 September) with 2 types of seedling (Nursery seedling and double planted seedling). Results revealed that delaying planting dates from 10 September to 30 September significantly and consistently reduced both grain and straw yields along with all the yield attributing characters during both the years. On an average, the grain and straw yield reduction being 58.3 and 19.3 per cent, respectively. Among the varieties tested, rice variety 'Monoharsali' outyielded the variety, 'Prafulla' and 'Gitesh'. Double planted seedlings of 60 days (30 + 30 days) old recorded significantly higher yields and all the yield attributes over the use of 60 days nursery seedling. The highest net return and benefit-cost ratio was recorded when rice variety, 'Monoharsali' was transplanted on 10 September using 60 days (30 + 30 days) double planted seedling.
A field experiment was carried out during kharif, 2012 to summer, 2013 under rainfed condition in the organic block of Assam Agricultural University, Jorhat to find out the effect of different green manuring practices and other organic sources of nutrient on productivity of scented (joha) rice and their residual effect on linseed crop. Results revealed that though green manuring practice had no significant effect on yield and yield attributes of both scented (joha) rice and succeeding relayed linseed crop but higher values were recorded with the incorporation of dhaincha as in-situ green manuring in respect of all the yield attributes and yield of both the main and succeeding crops. Among various organic sources of nutrient, application of enriched compost produced the highest yield in both scented rice as well as linseed crop. The increase in grain yield of scented rice with enriched compost over the other sources of organic nutrient and control treatment ranged from 7.33 to 30.04 per cent. The corresponding increase in case of linseed crop ranged from 29.1 to 39.8 per cent which reflected better residual effects of both the sources of nutrient on linseed crop. The residual available nutrient contents in soil after harvest of linseed crop showed similar trends and increased all the major nutrients over their initial status.
Field experiments were conducted in the organic block of Assam Agricultural University, Jorhat (Assam) during 2012-13 under rainfed condition to evaluate the effects of different timings of fresh cow dung application on the productivity of scented rice and its residual effect on succeeding linseed crop. The results revealed that all the timings of fresh cow dung application significantly increased grain and straw yields of scented rice over the control. Among different timings, application of fresh cow dung as 5 t/ha at planting + 2.5 t/ha each at 30 and 45 days after planting (DAP) recorded the highest grain and straw yields but did not differ significantly with the application as 3.4 t/ha + 3.3 t/ha + 3.3 t/ha at 15, 30 and 45 DAP in case of grain yield and with 2.5t/ha each at 7, 15, 30 and 45 DAP in case of straw yield. The residual effect of fresh cow dung on succeeding linseed crop was similar with that of scented rice, however, fresh cow dung applied in four splits as 2.5 t/ha each at 7, 15, 30 and 45 DAP in scented rice produced the highest seed and stover yields of linseed. The trend of available nutrient contents in soil after harvest of both the crops was almost similar with that of the yield of rice and linseed.
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