Composite nitrogen fertilizer

Abstract

The invention relates to a compound nitrogen fertilizer which is granular and is made from the following raw materials: calculated on the basis of total weight of raw materials of the compound nitrogen fertilizer, 30-40% of urea, 50-58% of ammonium chloride, 2.5-3.0% of diluted sulfuric acid and 0.8- 1.0% of synthetic ammonia. The inventive compound nitrogen fertilizer can efficiently increase the utilization rate of nitrogen element, prolong the period of fertilizer effect, increase crop yield, reduce the agricultural pollution of nitrogen fertilizer, and protect the environment.

Description

technical field [0001] The invention belongs to the technical field of agricultural chemical fertilizers, in particular to a nitrogen fertilizer. Background technique [0002] Nitrogen is one of the three essential nutrients for plants, and nitrogen fertilizer is the most widely used fertilizer in agriculture. At present, the main nitrogen fertilizer varieties in my country are urea, ammonium bicarbonate, ammonium chloride, ammonium sulfate, ammonium nitrate and so on. These nitrogen fertilizers can only be absorbed by plants when they are dissociated or decomposed to form ammonium nitrogen and nitrate nitrogen. These two forms of nitrogen can be transformed into each other and are easy to lose, especially the loss of nitrate nitrogen is very serious. The variety of nitrogen fertilizers has a low utilization rate, or will cause damage to the soil to varying degrees after long-term application. For example, after urea is applied to the soil, it is converted into ammonium car...

AI Technical Summary

Problems solved by technology

The technology of existing controlled-release nitrogen fertilizer mainly contains two kinds: one is to add nitrification inhibitor, urease inhibitor, nitrogen stabilizer etc., as in CN1173482, add materials such as urease, nitrification inhibitor, this method not only cost is high, Moreover, it also has the side effect of inhibiting the activities of beneficial bacteria in the soil and destroying the micro-ecological environment of the soil, which is essentially the destruction of the natural environment.

Another kind is the physical coating method, WO8801132 and US5547486, adopt sulfur coating or resin coating, but when the coating on the surface is not destroyed, the fertility is not easy to release, and after the coating is damaged, nutrients are released in large quantities, resulting in a large amount of nitrogen fertilizer loss

The patent number is CN00110382.2, and the Chinese invention patent titled a nitrogen fertilizer composition and its preparation method discloses a nitrogen fertilizer composition, which is composed of water-soluble nitrogen fertilizer, water, wax, emulsifier and emulsion aid. Through the dispersion membrane technology, the nitrogen fertilizer molecules, the oil phase and the emulsifier form a micron-scale oil-coated structure that is in close contact at the molecular level, and the smaller particles of each oil-in-oil nitrogen fertilizer produce strong water resistance to achieve better mitigation. Nitrogen-releasing fertilizer effect, but because the nitrogen fertilizer is in powder form, it has relatively high hygroscopicity, and it is easy to agglomerate when stored.