Diammonium phosphate has the characteristics of low nitrogen, high phosphorus, and no potassium, so it is particularly effective in phosphorus-deficient soils.
Fertilizer: The precise amount of ammonium phosphate used as a seed fertilizer can reflect a "smart". The low temperature of spring farmland, phosphorus activation in soil nutrients pool is slow, and the seedling stage of crops is in the critical period of phosphorus nutrition, sensitive to the reflection of phosphorus, easy to lack of phosphorus, and at this time phosphorus deficiency, crop seedlings are not strong, poor resistance .
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 fertilizer:
1. The dosage is controlled at 5kg/mu.
2, the application of technology to be applied in the seed obliquely below 2 to 3 cm. 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.
Basal fertilizer: Apply ammonium phosphate as a base fertilizer for spring crops to ensure that the melons and fruits, kernel weight, and yield are guaranteed in the middle and later stages of fertility. The base fertilizer of the crop is also called base fertilizer. Basal fertilizer is the nutrient that is applied to the whole growing period of the crops before the planting in the soil. For the needs of crops, phosphorus is the synthesis and transformation of nucleic acid nucleoproteins and carbohydrates in crops, and it is an indispensable nutrient element for transportation of grain and fruits. The role of base fertilizer is to supplement the nutrition in the middle and later stages, for which the phosphate fertilizer should be applied a little deeper. 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.
The amount of ammonium phosphonium used in the basal fertilizer varies depending on the type of crop and the fertilization status of the previous crop. For example, the farmland that has been applied with organic fertilizer can use less fertilizer; the plots that use ammonium phosphate each year can use less or change the application fertilizer. The suitable recommended amount of ammonium phosphate for general food crops is about 8 to 10 kilograms, 8 to 12 kilograms for soybeans, and 12 to 16 kilograms for cotton.
The use of taboos: Reasonable application of diammonium phosphate, there are two bogey: 1, should not use it as top dressing, spread on the surface. 2, do not use it for water fertilization, so that the gold and the precious phosphorus away from the surface runoff, and the crop root system simply can not reach.
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