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KMID : 0380119800030000011
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Korean Journal of Ecology
1980 Volume.3 No. 0 p.11 ~ p.16
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Effect of Nitrogen Applications on the Growth and Primary Production of Soybean Population
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Song Seung-Dal
Yu Seung-Won
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Abstract
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Growth analytical and primary productivity experiments of soybean populations were conducted with special references to the development of productive structures and environmental conditions of nitrogen levels(N_1, control; N_2, 6.67gN/㎡, N_3, 13.34gN/㎡). The maximum amounts in LAI for N_1, N_2 and N_3 stand were 17.3, 19.0 and 18.5; in total standing grops, 1570, 1785 and 1704gDM/㎡; in total net productions, 543.648 and 636gDM/㎡, respectively. The maximum CGR attanined were 208, 287 and 272 gDM/㎡/week, while the mean EU was 2.55, 2.92 and 2.84% for N_1, N_2 and N_3, respectively. The total nitrogen standing quantity attained 53.4, 71.8 and 59.8 gN/㎡ at the maximum standing crop period. The net nitrogen absorption rates showed highly significant differences among nitrogen treatments, i.e., 1.34, 10.77 and 13.22 ㎎/g/day for N_1, N_2 and N_3 stand, respectively.
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