Effect of Green Manures and Different Levels of Nitrogen on the Yield and Yield Components of Transplant Aman Rice
An experiment was conducted at the Agronomy Field Laboratory, Bangladesh Agricultural University, Mymensingh, during the period from May to November 1998 to investigate the effect of green manures and different levels of nitrogen on the yield and yield components of transplant aman rice (cv. BRRI Dhan32). The experiment comprised of 3 green manuring crops viz., Sesbania rostrata, Sesbania aculeata and Crotalaria juncea and 5 levels of N viz., 0, 20, 40, 60 and 80 kg ha-1. Among the green manuring crops Sesbania rostrata produced the highest grain yield of transplant aman rice compared to other green manuring crops. The highest grain yield was obtained when the crop was fertilized with 40 kg N ha-1 in combination with Sesbania rostrata. Sesbania aculeata exhibited similar behaviour as that of Sesbania rostrata but Crotalaria juncea showed lower performance in respect of yield and yield components of transplant aman rice. Sesbania rostrata also showed the best performance in respect of plant height, total number of tillers hill-1, number of effective tillers hill-1, number of grains panicle-1, weight of 1000 grains and straw yield compared to other green manures.
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