In the late growth stage of soybean, the effect of root-spraying fertilizer production was significant, which was related to the characteristics of soybean fertilizer absorption and soil fertility. The peak period of soybean fertilizer requirement was in the stage of reproductive growth, that is, in the late growth stage, these nutrients were taken from the soil below the plough layer. However, the nutrient conversion and release ability of the soil below the plough layer is much lower than that of the plough layer, which leads to the need for fertilizer peaks. The expectation of nutrient demand and soil fertility is inconsistent. Soybean roots (especially lateral roots) are mainly concentrated in In the surface soil, it is easy to have insufficient nutrition and premature aging in the middle and late growth stages, which has become the main factor limiting the high yield and stable yield of soybean.
Therefore, spraying the nutrient solution outside the roots of the soybean pods can alleviate the contradiction between the peak of soybean fertilizer and the difference of soil fertility, accelerate the accumulation, transformation and transportation of assimilation products, and promote the solidification and root activity of rhizobium. Improve the ability of roots to take up nutrients.
The preparation method of 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, dissolved in 25 kg of water, filtered to be nutrient solution, and foliar spray should be after 16 o'clock. Or in the evening, so that the leaves are evenly stained with nutrient solution without flowing, even sprayed 3 times, again separated by 3 to 4 days.
Therefore, spraying the nutrient solution outside the roots of the soybean pods can alleviate the contradiction between the peak of soybean fertilizer and the difference of soil fertility, accelerate the accumulation, transformation and transportation of assimilation products, and promote the solidification and root activity of rhizobium. Improve the ability of roots to take up nutrients.
The preparation method of 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, dissolved in 25 kg of water, filtered to be nutrient solution, and foliar spray should be after 16 o'clock. Or in the evening, so that the leaves are evenly stained with nutrient solution without flowing, even sprayed 3 times, again separated by 3 to 4 days.
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