Pariman nitrogen thi trung doi thuakhieo thualuang lae thualisong lae phon khong thua to nitrogen lae phosphorus nai din lae to khaophot thi pluk tamlang sung wat doi chai isotope.
1984
Amnat Suwanarit | Chairerk Suwannarat | Sukum Chotchungmaneerat
Two consecutive field experiments, using 15N and 32P, were conducted at the National Corn and Sorghum Research Center to quantify N fixed from the atmosphere by mungbean (Vigna radiata Linn.), soybean (Glycine max Merr.) and peanut (Arachis hypogea Linn.) and to examine effects of the legumes on the yields and N and P uptake of corn grown after the legumes and on status of N and P in soils during the growing period after the legume growing. Early sorghum (Setaria italica Beauv.) variety Uthong - 1, non-nodulating soybean variety Chippewa and KU-2301 hybrid corn (Zea mays Linn.) which were used as standard crops in quantifying amnounts of N fixed by mungbean, soybean, and peanut, respectively, gave essentially comparable "A" values for soil N though sorghum was harvested 30 days before the other standard crops. However sorghum tended to give lower values than the other crops did. Amounts of N fixed from the atmosphere were 37.5, 119.0 and 150 kg/ha for mungbean (variety Uthong 1), soybean (variety SJ 4) and peanut (variety SK 38), respectively. Corn grown in plots previously grown to legumes yielded higher grain and stover weights and higher N and P uptake; there were no significant differences among plots previously grown to different legumes. "A" values, which were used as indices showed that, among the 3 legumes, only soybean has positive effect to the availability of soil N and only mungbean had positive effect to the availability of soil P relative to corn.
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