When it comes to how to fertilize soybeans to achieve high yield, it is necessary to understand the characteristics of soybean fertilizer demand. The flowering and pod-setting period of soybean is the peak of nutrient absorption, which can also be decomposed into the peak of nitrogen, phosphorus and potassium absorption. For example, from Anne's branching stage to the early grain filling stage, the absorption and accumulation of nitrogen and phosphorus nutrients account for about 60% of the whole growth period, so flowering stage is the key period for topdressing.

Applying sufficient organic fertilizer (base fertilizer) as soybean base fertilizer can also improve soil fertility and fertility. Organic fertilizer, as the base fertilizer of soybean, can be applied in combination before ploughing, ploughing into the soil layer and mixing with topsoil, or disc applying into the 10 cm soil layer and fully mixing with soil. Chemical fertilizer is used as base fertilizer, and the application of nitrogen fertilizer often determines the fertility level of soil. Planting soybean in low fertility soil requires one-time application of nitrogen fertilizer as base fertilizer, which is not only harmful to seedlings, but also beneficial to mechanization.

Potassium fertilizer. The soil in northern soybean producing areas has strong potassium supply capacity. At present, potash fertilizer is not used much, but it is used more in the south. If there is no fertilization in the early stage and the soil fertility is low, a small amount of nitrogen fertilizer can be applied at the early flowering stage, and urea is the best fertilizer. If the performance of soybean plants is zero, ammonium phosphate and other fertilizers can also be applied when it is insufficient, and the fertilization place should be at the distance of soybean plants 10 cm. You can also spray nitrogen fertilizer at flowering stage, which can also increase production.

It is best to use organic fertilizer as the base fertilizer. An acre of land is about 2500 kilograms of rotting farmyard manure. It is suggested that about 45 kilograms of potassium sulfate compound fertilizer be ploughed into the soil. When the seedlings are small, the initial nodules have not yet formed, and the nitrogen fixation ability is weak, so nitrogen fertilizer can be supplemented appropriately. According to the development of seedlings, if the seedlings are yellow, 5 kilograms of urea can be supplemented appropriately per mu. The amount of nitrogen fertilizer should not be too much, otherwise it will inhibit the formation of nodules. Top dressing once after pod setting, about 8 kg urea and 8 kg potassium fertilizer per mu, and about 5 crops before flowering, which can be applied by water. In this way, fertilized soybeans can produce high yield.