Comparison of Phosphorus Deficiency Effects on the Growth Parameters of Mashbean, Mungbean, and Soybean

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Experiments were conducted in order to examine the inter-specific difference in low P tolerance in terms of biomass production, photosynthetic rate per unit leaf area (Po) and biological nitrogen fixation (BNF). Three legume species:mashbean (Vigna aconitifolia cv. Mash-88), mungbean (Viana radiata cv. Moong-6601), and soybean (Glycine max L. cv. Tamahomare) were grown at different levels of P applied in 1993 and 1994. Dry matter production increased in all the species with the increasing P levels. At low P levels up to 25 kg P ha^1, soybean displayed a relatively higher biomass production than mashbean and mungbean, which was mainly caused by the promotion of root growth and leaf area expansion. In low P mashbean plants leaf area development was severely inhibited while Po remained relatively stable in all the species irrespective of the P levels except for extremely low Po at later growth stages without application of P. A positive correlation between the amount of N accumulation and acetylene reduction activity (ARA) was found in all the species (r=0.77^*). At low P levels, soybean absorbed a larger P amount than other species and the amount of P absorbed was positively correlated with biomass production (r= 0.99^<**>). At low P levels, the P concentration decreased in all the plant parts and such a decrease was pronounced in the nodules. These results suggest that soybean has a higher tolerance under suboptimal conditions of P supply compared with mashbean and mungbean, mainly due to a higher ability of leaf area expansion and absorption activity of P through expansion of root interception.
社団法人日本土壌肥料学会の論文

Comparison of Phosphorus Deficiency Effects on the Growth Parameters of Mashbean, Mungbean, and Soybean

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