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Abstract
Soybean (Glycine max (L.) Merrill) plants grown under normal nutrient conditions remobilize a high percentage of the total P absorbed from leaves to developing seeds. This study was conducted to determine the effect of P nutrition on dry matter production and P accumulation, distribution and remobilization during reproduction in soybean. Williams 82 soybeans were established in hydroponic culture in the greenhouse at four levels of P (0.45 mM, 0.20 mM, 0.10 mM or 0.05 mM) and harvested four times during reproductive growth. Dry matter production and P accumulation were reduced in the 0.05 mM P treatment to levels that were 10% of the 0.45 mM P treatment. The proportion of total plant P retained by nodules of low P plants was greater than that retained by nodules of high P plants (8.9% vs 4.2%). The 0.05 mM P plants partitioned a greater percentage of their P to seeds (74% vs 63%) than did the 0.45 mM P plants. Remobilization of P began in the 0.05 mM P plants earlier than in plants grown with 0.45 mM P. Restriction of P supply resulted in a greater percentage of plant P being retained by roots and nodules, and also in an increased percentage of plant P remobilized to the seed. Increased P remobilization indicates the importance of P in the life cycle of the plant. Increased P retention by nodules suggests that root nodule bacteroids exert demands on P irrespective of plant P status.
Notes
Supported by the Missouri Agricultural Experiment Station and by a grant from the United States Department of Agriculture National Needs Fellowship Program, Grant 84‐GRAD‐9–0033. This research is a contribution of the Missouri Agricultural Experimant Station Journal Series No. 10821.