First, acid fertilizers must not be mixed with alkaline fertilizers. Ammonium bicarbonate, ammonium sulfate, ammonium nitrate, and ammonium phosphate cannot be mixed with alkaline fertilizers such as grass ash, lime, and kiln-ash potassium. Neutralization reaction occurs, resulting in loss of nitrogen and reduction of fertilizer efficiency.
Second, chlorine-containing fertilizers should not be used on saline and alkaline crops. The chlorine-tolerant crops include tobacco, sugar beets, potatoes, tea trees, peach trees, grapes, oranges, sugar cane, and watermelons.
Third, nitrogen fertilizers should not be applied shallowly or before watering. After nitrogen fertilizer is applied to the soil, it is generally converted into ammonium nitrogen, easily lost to water or volatilized by the effect of light and heat, losing its fertility.
Fourth, ammonium bicarbonate and urea can not be mixed. The amide nitrogen in urea can not be absorbed by crops. It can only be used by crops after being converted into ammonium nitrogen by the action of adenosine in the soil. After carbon iron is applied to the soil, the soil solution will be acidic in the short term and accelerate. Because of the loss of nitrogen in the urea, it cannot be mixed. Ammonium bicarbonate can not be mixed with bacterial fertilizer, because the former will emit a certain concentration of ammonia gas, which is toxic to the active bacteria of the latter, will make the fertilizer lose its fertilizer effect.
Fifth, nitrogen fertilizer should not be applied to legumes. There are nitrogen-fixing rhizobia in the roots of leguminous crops. Excessive application of nitrogen fertilizer will not only cause waste, but also make the crops greedy and late and affect the yield.
Six, phosphate fertilizer should not be used in dispersal. Phosphorus in phosphate fertilizers is easily absorbed and fixed by the soil. If the fertilizer loses its effect, the phosphorus fertilizer and the compost should be mixed and piled up for a period of time before being applied to the vicinity of the crop roots.
7. Fertilizers with high phosphorus content should not be used for vegetables. The demand for phosphorus in vegetables is relatively small.
VIII Potassium fertilizers should not be applied during the later stages of crop growth. When there are symptoms of potassium deficiency, the growth of the crop is near the end of the period. At this time, the top dressing will not have much effect. Therefore, potassium fertilizer should be applied to the crop during the seedling stage, or used as a base fertilizer.
Nine, rare earth fertilizers should not be applied directly to the soil. The use of rare earth fertilizers is relatively small. The correct method of application is to use rare earth fertilizers for seed dressing or for foliar spray applications.
10. It is not appropriate to disregard the fertilization of crop varieties and growth periods. Different crops and crops in different growth stages have different needs for the variety and quantity of fertilizers. Fertilization without crops and periods will only be counterproductive.
XI, ammonium sulfate avoid long-term application. Ammonium sulphate is a physiological acid fertilizer that is applied for a long time in the same soil and will increase its acidity and destroy the structure of the granules. In alkaline soils, the ammonium ion of ammonium sulfate is absorbed, and the acid ions remain in the soil and react with calcium to make the soil The knot hardens.
Twelve, unripe farmyard manure and cake fat should not be directly applied. The unfamiliar farmyard manure and cake manure contain many kinds of eggs and pathogens, as well as a large amount of carbon dioxide gas and heat. The direct use will pollute the soil, accelerate the evaporation of soil moisture, burn the roots of the crop, and affect the seed germination. The correct method of use is to first fully compost the farmyard manure and cake fat, and use it after high temperature disinfection or chemical treatment.