Parameters Determining Yield of Field Crops in Relation to the Amount of Nitrogen Absorbed
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概要
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Several field crops were grown at different nitrogen levels during 6 y, and under combinations of nitrogen levels and plant density. Then the parameters which determine the economic yield (Ye) were evaluated by using the following formula. Ye=Yb×HI(DM), Ye=Yb(N)×HI(N)/Nc(h.o.)×100, and Ye=Gn×Gw, where Yb is the biological yield; HI(DM) is the harvest index of dry matter; HI(N) is the harvest index of nitrogen; Yb(N) is the amount of nitrogen accumulated in plants; Nc(h.o.) is the nitrogen content of harvesting organs; Gn is the number of grains or tubers; and Gw is the one-grain weight or one-tuber weight. As the parameters showed a close relationship with Yb(N) with few exceptions, they were expressed by the function of Yb(N) as follows. HI(DM)=a_1Yb(N)+b_1, HI(N)=a_2Yb(N)+b_2, Nc(h.o.)=a_3Yb(N)+b_3, Gn=a_4ln(Yb(N))+b_4, Gw=a_5Yb(N)+b_5, where, a_1, a_2, a_3, a_4, a_5, b_1, b_2, b_3, b_4 and b_5 were constants. The HI(DM) and HI(N) were significantly constant in rice, maize, soybean, potato, and sugar beet because the a_1 and a_2 values were nearly zero, and HI(N) decreased with the increase of Yb(N) only in wheat. As Nc(h.o.) increased with the increase of Yb(N), Nc(h.o.) was the main factor determining the decrease of Ye when Yb(N) increased. As the value of a_4 in all the crops was significantly stable, unlike the value of a_5 in some crops, Ye was mainly determined by Gn which was affected by Yb(N). Thus, the Yb, HI(DM), HI(N), Nc(h.o.) parameters related to Yb(N) were useful for analyzing Ye.
- 社団法人日本土壌肥料学会の論文
著者
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Osaki Mitsuru
Faculty of Agriculture, Hokkaido University
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Shinano Takuro
Faculty of Agriculture, Hokkaido University
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Osaki Mitsuru
Faculty Of Agriculture Hokkaido University
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Shinano Takuro
Faculty Of Agriculture Hokkaido University
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Matsumoto Mika
Faculty of Agriculture, Hokkaido University
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Tadano Toshiakl
Faculty of Agriculture, Hokkaido University
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Matsumoto Mina
Laboratory Of Plant Nutrition Faculty Of Agriculture Hokkaido University
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