Evaluation of N_2 Fixation and N Absorption Activity by Relative Ureide Method in Field-Grown Soybean Plants with Deep Placement of Coated Urea
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概要
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In order to evaluate the beneficial effect of deep placement of coated urea fertilizer on soybean plant (Glycine max (L. ) Merr. cv. Enrei) cultivation, a field experiment was conducted with three fertilizer N treatments: control, conventional basal dressing of 16 kg N ha^<-1> as ammonium sulfate; basal deep placement of 100 kg N ha^<-1> as 100 d type coated urea; and top dressing of 100 kg N ha^<-1> as 70 d type coated urea just before the flowering stage. The seasonal variation in the N_2 fixation activity by the nodules and N absorption rates by roots were estimated by the determination of the relative ureide-N abundance in the root bleeding xylem sap by calculating the increase in total N accumulation. The N recovery rate from fertilizers was measured by the ^<15>N tracer method. The N recovery rate in the plants with deep placement of coated urea was about 62%, and much higher than that of the plants with top dressing of coated urea (33%) at the R7 stage. Top dressing treatment depressed the N_2 fixation activity during the maturing stage and the N absorption rate was higher than that of the control plants. On the other hand, deep placement of coated urea did not depress the N_2 fixation activity throughout the growth stages until maturity, though N from fertilizer was actively absorbed. Consequently, the plants with deep placement of coated urea accumulated more N both from N_2 fixation and N absorption than the plants with control and top dressing treatments. Seed yield was higher in the deep placement (592 g m^<-2>) compared with the control (480 g m^<-2>) and the top dressing (531 g m^<-2>) treatments. The basal deep placement of coated urea for soybean cultivation appears to be beneficial by supplementing soybean N without concomitant depression of N_2 fixation, and by increasing the seed yield. High recovery rate of fertilizer N is also desirable from the economical and economical view points.
- 社団法人日本土壌肥料学会の論文
著者
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Ohyama Takuji
Department Of Agricultural Chemistry Faculty Of Agriculture Niigata University
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TAKAHASHI Yoshihiko
Faculty of Agriculture, Niigata University
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Nishiwaki Toshikazu
Faculty of Agriculture, Niigata University
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Takahashi Yoshihiko
Niigata Agricultural Experiment Station
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Chinushi Toshikazu
Niigata Agricultural Experiment Station
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Nishiwaki Toshikazu
Faculty Of Agriculture Niigata University
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Chinushi Toshiaki
Niigata Agricultural Experiment Station
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Nakano Tomio
Niigata Agricultural Experiment Station
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Tamura Y
Faculty Of Agriculture Niigata University
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Takahashi Y
Faculty Of Agriculture Saga University
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Takahashi Y
National Institute Of Agro-environmental Sciences
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Nakano T
Faculty Of Agriculture Niigata University
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