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经水、土培研究表明，大豆分枝期茎、叶全磷分别低于０．２０％、０．４４％，可作为植株缺磷诊断指标。磷促进了大豆光合作用，降低呼吸作用及琥珀酸脱氢酶活性。磷主要增加了固氮酶、硝酸还原酶的活性，有利于种子氨基酸、蛋白质的积累，促进了大豆形态建成。水培介质磷达到１．００μｍｏｌ／ｇ时，导致根部磷成倍滞留；一般磷水平下，叶、荚器官中磷量较高。缺磷或适宜磷浓度处理，大豆磷素利用率最高。成熟期从根部转运到种子中的磷低于叶、荚皮等。基施磷肥，叶面施用硼、钼、钴肥，增加了大豆鼓粒期种子中全磷量。
The water and soil culture studies have shown that the total phosphorus in stem and leaf of soybean during the branching stage is less than 0.20% and 0.44%, respectively, which can be used as a diagnostic index for phosphorus deficiency in plants. Phosphorus promoted soybean photosynthesis, decreased respiration and succinate dehydrogenase activity. Phosphorus mainly increases the activity of nitrogenase and nitrate reductase, which is conducive to the accumulation of amino acids and proteins in seeds and promotes the formation of soybean. Hydrophoric media phosphorus reached 1.00μmol / g, resulting in root dwarf phosphorus retention; general phosphorus levels, leaves, pods organism in high phosphorus. Phosphorus deficiency or suitable for phosphorus treatment, the highest utilization of soybean phosphorus. Phosphorus translocated from the root to the seed at maturity is lower than leaves, pods and the like. Base phosphorus, foliar application of boron, molybdenum, cobalt fertilizer, increased soybean seedling stage of total phosphorus content.