Carry-over effect of organic materials on soil properties and yield of rice
1995
Zaman, S.K. | Bhuiyan, N.I. | Howlader, M. (Bangladesh Rice Research Inst., Gazipur (Bangladesh))
Long-term greenhouse experiments were conducted to evaluate the carry-over effects of organic materials on soil properties and yield of rice. Five sources of organic materials, namely, azolla (Azolla pinnata), cowpea (Vigna unguileata), Dhaincha (Sesbania aculeata), decomposed cowdung and compost each at 3 rates 0.5, 1.0 and 1.5 percent on dry weight basis were used. Two additional treatments, one absolute control (no fertilizers, no organic materials) and other recommended fertilizers (N-P2O5-K2O at 80-60-40 kg/ha) were also included for comparison. Young cowpea and Dhaincha shoots have good potentials for use as organic fertilizers for rice if used in adequate amounts and managed properly. The sources of organic materials and chemical fertilizers can be ranked in the order of cowpea Dhaincha azolla NPK fertilizers decomposed cowdung compost for their main effects on grain and straw yields during the 1st crop. The carry-over effects of organic materials may persist more than three crop seasons and improve the physical and chemical properties of soil.
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