Long term effect of organic material management on nitrogen availability
1993
Prapai Chairoj (Department of Agriculture, Bangkok (Thailand). Soil Science Div. Soil Chemistry Research Group)
Study on nitrogen availability and yield of maize in Packchong soils as affected by long term management with mimosa (living mulch), rice bean (relay cropping) (one kilogram seed/rai for each) rice straw mulch (640 kg/rai) and city compost (3,200 kg/rai) were evaluated. Experimental results showed that soil organic matter was increased by 0.5-0.7 percent in mimosa, rice bean and rice straw plots while it was increased about 2.1 percent in the city compost plot. soil biomass carbon and mineralizable nitrogen were increased as well. These increments were superior in the mimosa carbon and mineralizable nitrogen were increased as well. These increments were superior in the mimosa plot than those of rice bean, rice straw and city compost plots respectively. In addition, without fertilizer, mimosa, rice bean and city compost managements increased the yield of maize by about 32 percent over no management with chemical fertilizer application. Rice straw without fertilizer mulch was as effective as chemical fertilizer for yield production. However, rice straw in combination with chemical fertilizer increased the yield twice as mulch as chemical fertilizer application only.
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