Twelve taboos for fertilizer application

Avoid applying a certain kind of chemical fertilizer alone. The ideal application method is to apply organic fertilizer first, and then to apply nitrogen, phosphorus and potassium fertilizers reasonably and scientifically.

(2) do not apply fertilizer outside the root at high temperature at noon. The high temperature at noon not only evaporates quickly after spraying, but also the liquid fertilizer is not easy to be retained on the crop surface and is difficult to be quickly absorbed by stomatal lenticels.

(3) avoid shallow application of nitrogen fertilizer topsoil. When nitrogen fertilizer is applied in the shallow layer of topsoil and exposed to sunlight, it is easy to decompose and volatilize nitrogen.

Avoid using too much high concentration fertilizer at one time. No matter what kind of fertilizer, if the dose is too large, it will make the crop root system "inverted suction" phenomenon, resulting in root damage.

Do not sprinkle with water. If potassium dihydrogen phosphate and urea are mixed and applied with water, the weighing activity of phosphorus and potassium in the soil is small, and the utilization rate of fertilizer with water is very low, which basically stays in the topsoil.

Avoid using ammonia and ammonium bicarbonate in greenhouse or greenhouse. Because the ecological environment of the greenhouse is in a high temperature and closed state, these two kinds of fertilizers are very easy to volatilize and fumigate plants under high temperature and airtight conditions, affecting the normal growth.

7 avoid "Lalang match". Regardless of the nature of fertilizer, arbitrary combined application is not good, if the "ammonium nitrogen" fertilizer is mixed with alkaline fertilizers such as plant ash, lime and phosphate fertilizer, nitrogen volatilization will be accelerated, resulting in fertilizer waste and easy to fumigate crops.

Avoid spreading or applying phosphate fertilizer on the surface. The mobility of phosphorus in soil is very small, so it is easy to be absorbed and fixed by soil by spreading or topical application, which greatly reduces the fertilizer efficiency of phosphorus.

Avoid applying excessive nitrogen fertilizer to legume crops. The roots of legume crops are epiphytic rhizobium, if the application of too much nitrogen fertilizer, it will directly affect the nitrogen fixation ability of rhizobium.

Avoid excessive application of chlorine-containing fertilizers to sensitive crops. Tobacco, oranges, potatoes, grapes and other sensitive crops must not apply too much chlorine fertilizer at one time, otherwise it will affect the normal growth of plants.

Avoid fertilizing before heavy rain. Because of heavy rain or showers after fertilization, fertilizer can easily be washed by Rain Water to cause nutrient loss.

12 avoid using micro-fertilizer to be in charge. Zinc, molybdenum, boron, rare earth and other micro-fertilizers have a good effect on crop "deficiency", but must not be "micro-fertilizer in charge", resulting in crop malnutrition and hindrance of growth and development.

Sun Ting