Relationships between dry matter production, nitrogen and phosphorus accumulation in soybean grown under cool weather conditions

Abstract

Abstract The effect of cool weather conditions on nitrogen (N) and phosphorus (P) accumulation by soybean based on dry matter production was examined in both pot and field experiments. Pot experiment: Soybean plants, Glycine max L. Merr. cv. Tachiyutaka, were grown with or without rhizobium (Bradyrhizobium japonicum A1017) inoculation in a mixture of sterile soil, sand, and perlite under glasshouse conditions. After the growth of the plants for 46 d, half of the pots were transferred to a low temperature (15°C 14 h/13°C 10 h) glasshouse under reduced light conditions by shading. The other half of the pots was left in the previous glasshouse for the control treatment. At 0, 7, 16, and 28 d after the start of the treatment, the growth parameters and the Nand P contents of the plants were determined. The low temperature and shading (LT) treatment reduced the dry matter production by soybean irrespective of the inoculation. The relationship between plant dry weight and N accumulation was not affected by the L...