Agricultural potassium nitrate is a kind of high quality chemical fertilizer, which is classified as superior or primary quality. 13.5% excellent products containing nitrogen, potassium oxide containing 46.5%, a product containing 13.5% nitrogen, containing 44.5% potassium oxide. The crop of nitrogen, phosphorus and potassium of the three nutrient elements, nitrogen and potassium nitrate containing these two nutrients, and its solubility in water, fertilizer, spraying, can drip irrigation and infiltration irrigation application, can also be used as fertilizer. Potassium nitrate applied to farmland, can be fully absorbed and utilized by the crop, compared with potassium chloride, potassium sulfate, potassium fertilizer, residual chlorine ion and sulfate ion and other harmful substances can not be formed in the soil and is very suitable to use the fertilizer in the greenhouse crop production, can delay the process of soil salinization in greenhouse. In addition, grapes, potatoes, sugar beet, sugar cane, tobacco and other crops for the avoidance of chlorine crops, potassium chloride should not be applied, the use of potassium nitrate is beneficial to avoid chlorine damage, improve agricultural output and quality.

Urea, diammonium phosphate, ammonium bicarbonate, ammonium nitrate and nitrogen fertilizer application to the soil surface is volatile, easy volatilization, but also easy to use in the confined space of crops caused by gas harm (volatile ammonia will cause harm to the crop, and nitrogen) in the presence of potassium nitrate to nitrite, nitrate nitrogen it is often said that the volatility is very weak, even if applied on the soil surface does not appear too much nitrogen. Of course, potassium nitrate potassium, potassium chloride and potassium in potassium etc., in the wet dry condition to soil lattice is not fixed, easily absorbed by crops of slow-release potassium or invalid potassium fertilization should be applied to the surface of soil drought.

In general, potassium nitrate is a very suitable fertilizer for greenhouse production. The price, although the ratio of potassium nitrate and potassium sulfate is about 30% higher, but compared with the same weight of potassium sulfate, potassium nitrate, potassium content is 1.5 times that of potassium sulfate and potassium nitrate also contains nitrogen, so the relative costs of the application of potassium nitrate instead of lower. Users should be based on Soil Potassium Nutrition in abundance, by applying sufficient fertilizer for the application of potassium nitrate, nitrogen nutrient to the rest of the application of ammonium bicarbonate and urea, organic fertilizer and fertilizer supply. In actual application, it can be mainly used for basal application or combined with drip irrigation. At the middle and late stage of crop growth, foliar application of potassium nitrate can supplement nutrition directly.