First, use molybdenum dressing. The commonly used molybdenum fertilizer is ammonium molybdate. When dressing, only 2 grams of ammonium molybdate is used per kilogram of bean. First, ammonium molybdate was dissolved in 5 times hot water, stirred well, cooled and then dressed. Second, molybdenum fertilizer was sprayed on leaves before and after flowering. A concentration of 0.005% to 0.01% ammonium molybdate solution was sprayed. Foliar sprays are generally sprayed twice or more. Third, due to the lack of molybdenum symptoms in acidic soils, the appropriate amount of lime can be used to reduce soil acidity and improve the effectiveness of molybdenum. It should be noted that molybdenum is mainly applied by the method of external root fertilization, and it is generally not necessary to apply it to the soil. The purpose is to control the dosage. Therefore, if the method of soil application is adopted, 200 grams of molybdenum per acre should be mixed with the organic fertilizer and then applied. Do not use it in the same field year after year. Fourth, before molybdenum is applied to soybeans, it is first necessary to find out whether the soil is deficient in phosphorus. If phosphorus deficiency is to be supplemented with phosphate fertilizer, molybdenum fertilizer alone will reduce root nodules.
The root nodule condition of soybean is also related to the use of nitrogen fertilizer. If too much chemical nitrogen fertilizer is applied, root nodules can also be inhibited. It also shows that the number of root nodules in soybean is reduced, the tumor is small, and the rate of fixed nitrogen is reduced.
In addition, phosphorus plays an important role in the growth and development of soybean nodules and nitrogen fixation. Phosphorus not only promotes the growth of roots, but also contributes to the development of root nodules and enhances the nitrogen fixation capacity of root nodules. Therefore, in the leguminous crops, we must pay attention to the application of phosphate fertilizer, through the application of phosphorus fertilizer to promote nitrogen fixation, can achieve "nitrogen phosphorus" effect.
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