Nodulation and Nitrogen Fixation by Two Soybean Varieties as Affected by Phosphorus and Zinc Nutrition1

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Abstract
Symbiotic N fixation by soybeans [Glycine max (L.) Merr.] is one factor determining yields of this important crop. Microelements have been shown to be important in metabolic processes in plants. This investigation was conducted to determine the effects of Zn and P on growth, nodulation, and N fixation, in two soybean varieties grown in solution cultures. Zinc deficiency decreased shoot weights, Zn concentrations in all plant parts, nodule weights, nodule leghemoglobin concentrations, and amounts of N fixed. Growth and P and Zn concentrations in one or more plant parts and nodule weights were greater for the P‐tolerant variety than for the P‐sensitive variety. Excess P decreased growth of all plant parts, nodule weights, nodule leghemoglobin concentrations, and amounts of N fixed. Nodule weights and amounts of N fixed were greater for the P‐tolerant variety, particularly at the higher P level. Zinc deficiency and excess P may influence N fixation directly by affecting nodule nutrition and indirectly by affecting host nutrition.

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