After the Spring Festival, ushering in spring plowing, using ammonium phosphate to apply fertilizer, can play a "delicious effect". The low temperature of spring farmland, phosphorus activation in soil nutrients pool is slow, and the seedling stage of the crop is in the critical period of phosphorus nutrition, sensitive to phosphorus, easy to lack of phosphorus, and at this time phosphorus deficiency, crop seedlings are not strong, poor resistance . The farmer said: "There is money to buy seeds and no money to buy seedlings." It is difficult to obtain high yield in the later period.
The precise amount of ammonium phosphate applied at the time of sowing is called applying fertilizer or mouth fat. There are two key technologies for applying fertilizers. First, the dosage is controlled at 5 kg/mu. Second, the application technique must be applied to the seeds 2 to 3 cm below the slope. Do not allow fertilizers to come into contact with seeds. Spring corn, soybeans and cotton in the northern spring crop all require the application of seed fertilizers.
Ammonium phosphate was used as a base fertilizer for spring crops to ensure that the fruits and seeds were strong, grain weight and yield were guaranteed in the middle and late fertility. For the demand of crops, phosphorus is an indispensable nutrient element of crops, so the demand for crops during the later period of fertility is large. Because of the poor mobility of phosphorus in the soil, the absorption efficiency can only be increased if it is applied to the distribution area of ​​the main root system of the crop. The depth of the base fertilizer for different crops should be different. In particular, fruit trees require 40-60 cm, vegetables 20 cm, and food crops 20-30 cm.
Reasonable application of diammonium phosphate also has two bogey: first, avoid using it as top dressing and spreading it on the surface; second, avoid using it as water fertilization, so that the precious phosphorus is taken away from the surface runoff, and the crop root system is fundamental. Out of reach. In addition, use alternative measures for low-level phosphate fertilizers. Ammonium phosphate is more expensive and farmers can use other cheap phosphate fertilizers
In addition, the alternative phosphorus fertilizers of the same kind as ordinary calcium are calcium magnesium phosphate fertilizers, which are non-water soluble phosphate fertilizers, suitable for slightly acidic and acidic soils in central and southern China and can only be used as basal fertilizers. The other features of calcium, magnesium, and phosphate are the same as that of ordinary calcium. Besides calcium and magnesium, it also contains silicon, which can enhance the robustness and disease resistance of rice straw.
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