Ammonium bicarbonate should not be applied lightly and dryly.
Since ammonium bicarbonate is very unstable, it is most easily decomposed into ammonia gas and volatilizes. The higher the temperature, the greater the volatilization loss, so it is not suitable for use in greenhouses, and it cannot be applied to topsoil. , The depth is below 6cm. Immediately after application, cover soil or water. If the soil is dry when applied, it should be mixed with water or human and animal manure.
Urea fertilizer should not be watered immediately after application.
After urea is applied to the soil, it will quickly turn to ammonium amonia, which is easy to run off with water. Therefore, water should not be applied immediately after application, and it should not be applied before heavy rain. Deep application of soil can increase fertilizer efficiency by more than 20%. Urea is easily soluble in water, and is easily absorbed by the stomata on the leaves. It can be used as a top-dressing fertilizer. It can effectively prevent the occurrence of premature aging of plants due to nitrogen deficiency in the middle and later stages, but care must be taken to avoid burning and burning seedlings. Urea also bogey for fertilizer.
Ammonium sulphate avoid long-term use.
Ammonium sulphate is a physiological acidic fertilizer. If it is applied in the ground for a long time, it will increase the acidity of the soil and destroy the structure of the soil aggregates, which will make the soil compact and reduce the physical and chemical properties, which is not conducive to fertility.
Nitrate nitrate fertilizers should not be applied in paddy fields and vegetable fields.
Nitrate, nitrate and other nitrate nitrification fertilizers tend to produce denitrification and loss of nitrogen after they are applied to paddy fields. When applied on dry land, it should not be applied before the rain, nor can it be watered immediately after application. Nitrate-nitrogen fertilizers, when applied to vegetable plots, will double the nitrate content of vegetables and reduce them into nitrite in the human body, which is extremely harmful to the human body.
Containing chlorinated fertilizers should not be applied to saline and alkaline crops.
Ammonium chloride, potassium chloride and other chlorinated fertilizers applied to the soil after decomposing in the soil will lead to acidification of the soil, and use on saline-alkali soil will increase salt damage. The application of chlorinated fertilizers to bogey-chlorinated crops such as potatoes, watermelons, grapes, sugar beets, and tobacco can reduce the starch and sugar content of the product, affecting the yield and quality of the product.
Phosphate fertilizers should not be dispersedly applied.
Due to the low activity of phosphate fertilizers, it is difficult to be absorbed by crops. Therefore, in the application of phosphate fertilizer, should be used as basal fertilizer, and more concentrated in the sowing ditch or nest, preferably mixed with organic slag fertilizer for a period of time to help improve fertilizer efficiency.
Potash fertilizer should not be applied at the later stage of crop growth.
Because of the potassium in the lower stems and leaves of crops, it can be transferred to the top of the delicate part and reused. Therefore, potassium fertilizer should be applied in advance at the seedling stage of the crop or in the early stage of reproductive growth, or be used as a base fertilizer at one time.
Nitrogen fertilizer and nitrogen compound fertilizer should not be applied to legumes.
There are nitrogen-fixing rhizobia in the roots of leguminous crops. Excessive application of nitrogen fertilizers will not only cause late-maturing, but also affect the growth of rhizobia and reduce nitrogen fixation.
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