Effect of incorporating and mulching legumes on soil nitrogen fertility
1998
Orapin Suriyapan (Department of Agriculture, Bangkok (Thailand). Soil Science Div. Soil Chemistry Research Group)
Soil samples were taken from plough layer of trial field. The experimental plot was done on Warin soil series on the Agriculture Development Research Center (ADRC) in Khon Khen province. Split plot design with 3 replications was laid out; main plot was composed of 1) incorporating of legume 2) mulching of legumes species: sunnhemp (Crotalaria juncea), sesbania (Sesbania rostrata), jack bean (Canavalia ensiformis) and cowpea (Vigna unquiculata) grown on the soil and then harvested as green manure when maturing. Soil samples were taken before and 2 years after growing of corn after incorporating and mulching of legumes. Available nitrogen was determined by incubation method. It was revealed that, inorganic nitrogen was increased for all treatments. Incorporating with legumes increased nitrogen higher than mulching with legumes. Nitrogen increased was in the order of jack bean cowpea sunnhemp sesbania as the following 11.41, 10.75, 10.43 and 9.96 Kg N per rai, respectively. Mulching legumes given the inorganic nitrogen to this same order, i.e., jack bean cowpea sunnhemp sesbania as the following 10.4, 10.25, 9.996 and 9.672 Kg N per rai, respectively. Besides, the organic matter, phosphorus, potassium, calcium, magnesium and cation exchange capacity were all increased with the incorporating of legumes.
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