The effect of extra-root-spraying fertilizer on soybean production in late growth stage is significant, which is related to the characteristics of soybean sorptive fertilizer and soil nutrient supply law. The peak period of soybean requirement is in the reproductive growth stage, that is, in the later growth stage, these nutrients are taken from the soil below the tillage layer by the root system. However, the nutrient conversion and release capacity of the soil below the tillage layer is far lower than that of the tillage layer, which leads to the need for nutrient peaks in soybeans. There is an inconsistency between the demand for nutrients and soil fertility, and soybean roots (especially the lateral roots) are mainly concentrated in In the surface soil, it is prone to malnutrition and premature senescence in the middle and late fertility period, which has become the main factor limiting the high and stable yield of soybean.
Therefore, the application of nutrient solution outside the root of soya bean pods can alleviate the contradiction between the peak fertilizer requirement of soybeans and the poor soil supply, accelerate the accumulation, transformation and transportation of assimilation products, and at the same time promote the solidification and root activity of rhizobia. Improve root intake of nutrients.
The preparation method of the nutrient solution is: Weigh 0.5 kg of urea, 105 g of superphosphate, 107.5 g of potassium sulfate, 12.5 g of boric acid, dissolve in 25 kg of water, and use nutrient solution after filtration. The foliar spray should be applied after 6:00 pm Or in the evening, the leaves are evenly stained with nutrient solution and do not flow. They are sprayed three times and again for 3 to 4 days.
Therefore, the application of nutrient solution outside the root of soya bean pods can alleviate the contradiction between the peak fertilizer requirement of soybeans and the poor soil supply, accelerate the accumulation, transformation and transportation of assimilation products, and at the same time promote the solidification and root activity of rhizobia. Improve root intake of nutrients.
The preparation method of the nutrient solution is: Weigh 0.5 kg of urea, 105 g of superphosphate, 107.5 g of potassium sulfate, 12.5 g of boric acid, dissolve in 25 kg of water, and use nutrient solution after filtration. The foliar spray should be applied after 6:00 pm Or in the evening, the leaves are evenly stained with nutrient solution and do not flow. They are sprayed three times and again for 3 to 4 days.
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