Phosphorus-nitrate-type controlled-release bulk blending fertilizer

Abstract

The invention discloses a phosphorus-nitrate-type controlled-release bulk blending fertilizer. The fertilizer is prepared from the following raw materials in parts by weight: 20-60 parts of a phosphorus nitrate fertilizer, 10-30 parts of coated urea, and 10-70 parts of a common fertilizer. The total nutrient of the phosphorus nitrate fertilizer is 35%-40%, and the nitrogen content of the coated urea is 33%-46%. The common fertilizer is prepared from urea, monoammonium phosphate, diammonium phosphate, potassium chloride, potassium sulphate, ammonium chloride, and ammonium sulfate. The related phosphorus nitrate fertilizer adopts a technology of decomposing phosphorite by nitric acid, and does not contain biuret. The fertilizer is prepared from two forms of nitrogen sources of nitrate nitrogen and ammonium nitrogen, and two types of phosphorus sources of water-soluble phosphorus and citric acid soluble phosphorus. The fertilizer is rich in medium trace elements and nitrate rare earth activated by nitric acid, and 5 levels of the coated urea released by the coated urea. The fertilizer is capable of completely satisfying soil testing and formulated fertilization promoted in China, anda formula proportion can be adjusted according to a soil testing result. Quick-acting, intermediate-acting and long-acting nutrients can be perfectly combined. The production and income are increasedin the case of reducing a dosage of the fertilizer. A purpose of keeping soil healthy is realized.

Description

technical field [0001] The invention relates to an agricultural fertilizer, in particular to a phosphorus nitrate controlled-release mixed fertilizer. Background technique [0002] my country is a large agricultural country, and the application of chemical fertilizers is increasing year by year, so there is little room for improvement in output. At present, in crop planting, the problem of blind fertilization and excessive fertilization is relatively common. Only emphasis on the application of nitrogen, phosphorus and potassium macronutrients, and light application of trace elements, resulting in imbalanced ratios and low fertilizer utilization rates, which not only reduce the fertilization effect, but also increase Production costs, and if things go on like this, it will lead to acidification of the soil, which will greatly reduce the yield and quality of crops, and cause losses to production. Coupled with the country's emphasis on agriculture, rural areas and farmers in r...

AI Technical Summary

Problems solved by technology

[0004] The disadvantages are: 1. In the case of wheat topdressing, due to the low rainfall in spring, it is inconvenient to topdress, and in addition to the low temperature, the conversion of urea to the surface of nutrients is slow, and the utilization rate is extremely low

2. In the case of one-time fertilization without top-dressing, if the rainfall is heavy before the year, the nutrient loss will be serious, and the joint will be weak after the year, and the tillering will not be easy to form ears, resulting in a decrease in yield

[0006] The disadvantages are: 1. In the case of corn topdressing, the big trumpet period is that the rainfall is concentrated in a year and there are many heavy rains, which will easily cause serious fertilizer loss and decrease the utilization rate.

2. If corn is not topdressed, it will also encounter excessive rainfall in the early stage, and the loss of nutrients will lead to a lack of fertilizer from the jointing stage to the flowering stage, and the yield will drop severely.