Multi-element and slow-released fertilizer

Abstract

The invention relates to a long-acting multi-element fertilizer which is prepared by raw materials of urea, overbearing calcium phosphate or diammonium phosphate, ammonium diacid phosphate, agricultural potassium sulphate, potassium oxide or potassium chloride and fertilizer additives. The fertilizer is based on nitrogen, phosphorus and potassium, and has humate and yellow phosphorus furnace slag silicon fertilizer or iron slag silicon fertilizer as well as blended raw ore powder containing porphyraceous feldspar granite, medical stone, bentonite clay and lanthanide rare earth added thereto, wherein, the humate and the yellow phosphorus furnace slag silicon fertilizer or iron slag silicon fertilizer contain many active materials, the blended raw ore powder contains long-acting elements such as phosphorus, potassium, middle elements, trace elements, as well as beneficial elements including silicon, sodium, cobalt, selenium, nickel, titanium and iodine, etc. According to the field experiments, the long-acting multi-element fertilizer can supply all nutrient elements required by crops, thereby promoting the crop growth.

Description

technical field [0001] The invention relates to a long-acting multi-element fertilizer suitable for crops. Background technique [0002] Chemical fertilizers have been used in agriculture for more than 100 years. In the middle and late 1980s, China's compound (mixed) fertilizer industry developed rapidly, and experienced several stages of binary compound fertilizer, ternary compound (mixed) fertilizer, multi-component compound fertilizer and organic and inorganic compound fertilizer. At present, it is developing in the direction of slow and controlled release fertilizer. [0003] The application of compound (mixed) fertilizers can basically overcome the problem of soil nutrient imbalance caused by the application of simple chemical fertilizers. However, due to the low effective utilization rate of existing compound (mixed) fertilizers, rapid loss and large waste, it is impossible to thoroughly solve the problems of soil compaction and atmospheric soil pollution of undergro...

AI Technical Summary

Problems solved by technology

7% zinc sulfate and manganese sulfate, 5% ferrous sulfate are added to the fertilizer, and the excessive dosage is difficult to be accepted by the manufacturer

[0006] Chinese patent 971256942 "biochemical long-acting fertilizer and its production method", the fertilizer uses weathered coal as inhibitor-activator, primary minerals containing silicon and potassium as mineral stabilizer, metal sulfate as chelating agent, urea, phosphate , Potassium salt as raw material, processed under specific technological conditions, the product uses fewer types of nutrients, it is difficult to fully provide the nutritional requirements for crop growth and development