Effects of green manuring and nitrogen fertilizer on the growth and yield of rice [in Bangladesh]
1991
Ahmed, M.R. | Miah, N.I. | Husain, M.M. | Amin, R.
The effects of green manuring with cowpea and sunnhemp on irrigated rice was studied on a heavy clay soil in the BRRI research farm during 1983 Boro season. The aim of the trial was to examine the effects of green manuring in association with applied fertilizer nitrogen on the growth and yield of rice cultivar BR14. Both cowpea and sunnhemp alone and with applied nitrogen increased tiller number and yield. Cowpea with 80 kg N/ha produced grain yield of 4.8 t/ha and was very similar to that obtained by 120 kg N/ha alone. Green manuring with sunnhemp appeared to be superior to cowpea. Sunnhemp with 40 kg N/ha produced the highest grain yield (5.3 t/ha). Applied nitrogen beyond 40 kg/ha in association with sunnhemp did not increase yield. It was concluded that a good crop of green manure could provide about 50% of the total nitrogen requirement of a rice crop on a similar soil type
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