COMPARISON OF FERTILIZER NITROGEN AMONG FIELD CROPS
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概要
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(1) Rice, winter wheat, maize, soybean, potato, and sugarbeet were grown with 0, 100, 200, and 300 kg N/ha, and the efficiency of fertilizer-N to produce dry matter of harvesting organs (yield) was analyzed using the following equations: Y=N(plant)・M-E=N(plant)・HI(N)/N%(h.o.), where Y= Yield, N(plant)=N accumulated in plants=Soil-N absorbed + (fertilizer-N applied)・(absorption percentage of fertilizer-N), N-E= Efficiency of N(plant) for Y, HI(N) = Harvest index of N, and N%(h.o.) = N% of harvesting organ. (2) The yield was generally in the order of sugarbeet, potato>maize, wheat rice>soybean. (3) The maximum yield was obtained at 100 kg N/ha in sugarbeet and rice, 200 kg N/ha in wheat, and 300 kg N/ha in maize, potato, and soybean. The protein yield of potato at 200-300 kg N/ha was as high as that of soybean. (4) With the increase of the fertilizer-N level, the N(plant) increased, the absorption percentage decreased, the N-E decreased, the HI(N) decreased, and the N%(h.o.) increased. The magnitude of these increases and decreases differed among the crops. Thus, comparison of the efficiency of fertilizer-N among crops is complex. (5) Sugarbeet absorbed more actively soil-N as well as fertilizer-N, and the N-E was high due to the presence of a low N%(h.0.). However, at above 100 kg N/ha, the N-E decreased remarkably due to the increase of N%(h.o.). (6) Potato responded to fertilizer-N from 0 to 100 kg N/ha better than grain crops due to the high HI(N). The HI(N) remained high and the protein yield was high at high fertilizer-N levels.
- 社団法人日本土壌肥料学会の論文
著者
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TANAKA Akira
Faculty of Agriculture, Hokkaido University
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Miura Shu
Kamikawa Agricultural Expreriment Station Asahikawa
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YAMAGUCHl Junichi
Faculty of Agriculture. Hokkaido University
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TAMARU Hiroyuki
Central Agricultural Experiment Station
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Tanaka Akira
Faculty Of Agriculture Hokkaido University
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