What fertilizer to apply to soybeans and key points of fertilization techniques

What fertilizer to apply to soybeans and key points of fertilization techniques

During the growth of soybeans, it is necessary to apply fertilizer reasonably according to different periods so that it can serve the purpose of high efficiency. Here we will look at what fertilizer for soybeans and master the technical points of soybean fertilization.

A. Soybean fertilizer needs characteristics

Generally, every 100 kg of soybean production needs to absorb about 8.1-10.1 kg of nitrogen, 1.8-3 kg of phosphorus pentoxide, 2.9-6.3 kg of potassium oxide. The ratio of nitrogen, phosphorus and potassium is about 1:0.3-0.4:0.35-0.6.

Soybean rhizobia can fix the nitrogen in the air, its rhizobia nitrogen fixation can be for their own nitrogen needs of about 40% - 60%.

Second, soybean fertilizer absorption law

Soybeans absorb less before flowering, after flowering to the bulge period to absorb more nitrogen, the absorption of phosphorus in the seedling to the first flowering period absorption accounted for 15%, flowering and pod period absorption accounted for 60%, pods to the bulge period absorption accounted for about 20%, the absorption of potassium before flowering to absorb more potassium, in the pod period to the maturity of potassium absorption rate decreases.

Third, soybean fertilization principles

Soybean implementation of nitrogen, phosphorus formula or nitrogen, phosphorus, potassium formula. The principle of fertilization is the application of sufficient fertilizer, timely phased fertilization. Organic fertilizer is the main base, with phosphorus, potassium fertilizer and appropriate amount of nitrogen fertilizer, fertilizer in the seedling stage, the first flowering period and pod stage, the amount of nitrogen should not be too much when chasing fertilizer. The amount of nitrogen should not be too much when chasing fertilizer. It is required to be about 10 cm away from the root system when applying.

Four, fertilization technical points

1、Base fertilizer. Generally, organic fertilizer (2,000-3,000) kg per mu can be applied to the previous crop of food crops on rotational land to improve soybean yields. Soybeans grown on low-fertility soils can use 10 kg each of calcium superphosphate and potassium chloride as base fertilizer, which is good for soybean yield.

2. Seed fertilizer. Generally, mu use calcium superphosphate or 5kg diammonium phosphate as seed fertilizer. Try to apply seed fertilizer to the lower part of the seed or side, do not make direct contact between the seed and fertilizer.

3, chasing fertilizer. The first thing you need to do is to pay full attention to the fertility of the soil and the type and number of children in the base and seed fertilizer, the fertility stage of soybeans and their strength, and so on, to decide whether to chase fertilizer.