Phosphorus has a promoting effect on the growth of soybean roots, and is also conducive to the formation of root nodules. When the supply of phosphorus in the soil is insufficient, soybean root nodules can invade the roots but do not produce nodules. The molybdenum fertilizer is an essential trace element for root nodules fixation. In the absence of phosphorus in the soil, the application of molybdenum fertilizer alone reduces root nodules. Phosphorus plays an important role in the synthesis of amino acids in root nodules and in the transfer of soluble nitrogen from nodules to other parts of the plant. Therefore, planting soybean or other legume crops, the application of phosphate fertilizer to increase yield is particularly significant.
Phosphate fertilizers are less mobile in the soil and are easily adsorbed and fixed. Therefore, phosphate fertilizers should be mixed with organic fertilizers, and then concentrated application methods such as furrow application and hole application should be preferred. The application amount of superphosphate is 15-25 kg per acre, and the amount of phosphorus-poor soil can be increased appropriately. Soybean planting time can be a small amount of superphosphate seed dressing to meet the needs of the growth of seedlings and rhizobia reproduction of phosphorus. Soybean can be applied with potassium dihydrogen phosphate foliar fertilizer, the concentration of 0.1% -0.2%, sprayed once in the initial flowering period and the final flowering period, each with about 100 grams, there is also a certain increase in production.
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