Effect of Deep Placement of Slow Release Nitrogen Fertilizers and Inoculation of Bradyrhizobia on the First Cropping of Soybean in the Field Dressed with Mountain Soil

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  • 窒素深層施肥と根粒菌接種が客土造成転換畑初作ダイズに及ぼす影響
  • チッソ シンソウ セヒ ト コンリュウキン セッシュ ガ キャクド ゾウセイ テンカンバタケ ショ サク ダイズ ニ オヨボス エイキョウ

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Abstract

Population of GUS marked bradyrhizobia inoculated in five different soils including calcined vermiculite increased over 10 times in a week. Each soybean seed was planted in a paper pot filled with vermiculite inoculated with or without bradyrhizobia, and the 10-d-old seedlings were transplanted with a paper pot to the first cropping reclaimed field in Niigata. In addition to the conventional fertilization (1.6 g N m^<-2>), deep placement of urea, 100 d type coated urea, or calcium cyanamide (10 g N m^<-2>) was applied. In conventional fertilization the soybean plants transplanted with non-inoculated paper pot did not nodulate due to the absence of indigenous bradyrhizobia, and the seed dry weight was lowest, about 9 g plant^<-1>. Seed dry weight of the plants either with paper pot inoculation or seed inoculation was higher, about 22 g plant^<-1>. Soybean plants with deep placement of calcium cyanamide exhibited prolonged leaf activity. With deep placement of urea, coated urea and calcium cyanamide, seed dry weight increased to 32-37, 40-44 and 38-47g plant^<-1> respectively. The highest average seed yield was obtained in the inoculated paper pot transplantation with calcium cyanamide.

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