Maintenance of soybean yield with reduced phosphorus application by previous cropping with mycorrhizal plants(Soil Biology)
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概要
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Previous cultivation of arbuscular mycorrhizal (AM)-host plants promotes AM colonization, phosphorus (P) uptake and the growth of succeeding AM-host plants. Three field experiments were conducted to investigate whether reduced application rates of P fertilizer could maintain soybean (Glycine max (L.) Merr. cv. Tsurumusume) yields when fields were previously cropped with AM-host plants. In the experiments, soybean was cropped after growing both AM-host (wheat, sunflower, vetch, maize and azuki bean) and non-AM-host plants (radish, white mustard, sugar beet and buckwheat) or fallow with different rates of P fertilizer (0-200kg P_2O_5ha^<-1>). The results showed that previous cropping with AM-host plants increased AM colonization of soybean roots, soybean growth, shoot P content and yield compared with either previous cropping with a non-AM host or fallow treatment. Soybean yields following AM-host plants did not decrease with reductions in the P application rate from 150 to 50kg P_2O_5ha^<-1>, although soybean yields decreased in some cases after non-AM-host plants or fallow treatment. A general linear model analysis revealed that soybean yield following AM-host plants was less affected by a reduction in P application rate than plants following non-AM-host plants. As a result, P application rates can be reduced from 150kg P_2O_5ha^<-1> (the rate recommended by the Hokkaido Government) to 50kg P_2O_5ha^<-1> for soybean cultivation in soils after AM-host plants.
著者
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Takebe Masako
National Agricultural Research Center for Hokkaido Region
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Takebe Masako
National Agricultural Res. Center Tsukuba Jpn
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Takebe Masako
Hokkaido National Agricultural Experiment Station
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OKA Norikuni
National Agriculture and Food Research Organization, National Agricultural Research Center for Hokka
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KARASAWA Toshihiko
National Agriculture and Food Research Organization, National Agricultural Research Center for Hokka
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OKAZAKI Keiki
National Agriculture and Food Research Organization, National Agricultural Research Center for Hokka
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Oka Norikuni
National Agricultural Research Center For Hokkaido Region
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Okazaki Keiki
National Agricultural Research Center For Hokkaido Region
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Okazaki Keiki
National Agriculture And Food Research Organization National Agricultural Research Center For Hokkai
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Karasawa Toshihiko
National Agriculture And Food Research Organization National Agricultural Research Center For Hokkai
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Karasawa Toshihiko
National Agricultural Research Center For Hokkaido Region
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Karasawa Toshihiko
National Agricultural Research Center
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OKAZAKI Keiki
National Agricultural and Food Research Organization / Hokkaido Agricultural Research Center
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