PARAMETERS DETERMINING DIFFERENCES OF PRODUCTIVITY AND NITROGEN RESPONSE AMONG CROPS
スポンサーリンク
概要
- 論文の詳細を見る
1) Relative importance of parameters, which determine the differences of economic yield ( Ye, dry matter production of harvesting organ) and nitrogen response among major crops in Hokkaido, northern Japan, were evaluated by using the following formula. Ye=TGD×SR×ER×EC×PR×0.267×CEe, where TGD, total growth duration; SR, solar radiation per day ; ER, energy receiving ratio by crop population; EC, energy conversion ratio to produce primary photosynthates; PR, partition ratio of primary photosynthates to harvesting organ; and CEe, conversion efficiency of harvesting organ. 2) The Ye was in the order of sugarbeet>potato>maize>rice>soybean. 3) Major yield-determining parameters were EC and TGD in rice, PR in maize, CEe, EC and TGD in soybean, TGD in potato, and Ec in sugarbeet. Maize and potato had a higher EC and PR, respectively, in comparison to other crops. 4) The difference of ER among crops was small if a whole growth cycle was considered. However, the changes of the light transmission ratio during the growth were different among crops. 5) The nitrogen response from 0 to 100 kg Nha^<-1> was in the order of rice>maize>potato>sugarbeet>soybean. The increase of Ye by nitrogen application was due to the increase of ER in rice and potato, to the increases of EC and OR in maize and to the increases of ER and EC in sugarbeet, respectively. 6) The change of Ye from 100 to 300 kg Nha^<-1> was slightly positive in maize, potato and soybean, but was negative in rice and sugarbeet. The negative response was due to the decreases of EC and PR in rice and to the decrease of PR in sugarbeet.
- 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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YAMAGUCHI Junichi
Faculty of Agriculture, Hokkaido University
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Yamaguchi Junichi
Faculty Of Agriculture Hokkaido University
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KONNO Hiromichi
Bayer Yakuhin Co., Ltd.
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Konno Hiromichi
Bayer Yakuhin Co. Ltd.
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Tanaka Akira
Faculty Of Agriculture Hokkaido University
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