"five don't" should be achieved when applying chemical fertilizer.

Do not apply nitrogen fertilizer shallowly, because if nitrogen fertilizer is applied in the shallow layer, it is easy to decompose and volatilize nitrogen after being exposed to sunlight, especially ammonium bicarbonate. Therefore, it is necessary to change the habit of spreading on the surface and take the way of trenching and burying deeply in order to prevent the volatilization of nitrogen.

Do not apply a single chemical fertilizer, because the single application of a chemical fertilizer will lead to the destruction of soil aggregate structure, resulting in hardening of soil texture, soil acidity or alkali, and serious damage to soil physical and chemical properties. And the single application of a chemical fertilizer will also affect the reproduction of beneficial microorganisms in the soil, thus making the soil barren. Therefore, it is necessary to make a reasonable formula for fertilization and achieve the mixed application of organic fertilizer.

Do not apply ammonia and ammonium bicarbonate in the greenhouse or greenhouse, because the ecological environment of the greenhouse is in a state of high temperature and closed growth environment, these two kinds of fertilizers are very easy to volatilize under high temperature and closed conditions, and the higher the temperature, the faster the volatilization of "ammonia". The more volatilized, the more volatilized, which will cause ammonia fumigation to affect the normal growth of crops.

Do not apply too much high concentration fertilizer at one time, whether nitrogenous fertilizer or organic fertilizer, do not apply too much at one time, for example, the nitrogen content of urea is as high as 46%. If the dosage is too high and the concentration is too high, it will cause the crop root system to be "inverted". Cause damage to the roots until rotten roots die. Therefore, it is necessary to master the principle of steady and skillful fertilization of "a small number of meals".

Do not mix two kinds of fertilizers arbitrarily according to the nature of fertilizers. For example, for some "ammonium nitrogen" fertilizers, they must not be mixed with alkaline fertilizers such as plant ash, lime, phosphate fertilizer, etc., and ammonium bicarbonate should not be mixed with human feces and urine. If the two are mixed, it is bound to accelerate the volatilization of nitrogen, and the loss of fertilizer efficiency will be more severe.