Fertilizer use common sense

  1. Ammonium bicarbonate and urea cannot 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 gland enzymes in the soil. After carbon iron is applied to the soil, the soil solution will be acidic in a short time and will accelerate. The volatilization loss of nitrogen in urea cannot be mixed. Ammonium bicarbonate can not be mixed with bacterial fertilizer, because the former will emit a certain concentration of ammonia gas, which has a toxic effect on the latter's active bacteria, which will make the bacterial fertilizer lose its fertilizer effect.

    2. Acidic fertilizers should 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, kiln ash and potassium fertilizer, and neutralization reaction will occur, resulting in loss of nitrogen and reducing fertilizer efficiency.

    3. Nitrogen-containing compound fertilizer should not be applied to legume crops. Soybean, mung bean, peanut and other legume crops have nitrogen-fixing rhizobium. Excessive application of nitrogen-containing compound fertilizer not only causes waste, but also inhibits rhizobial activity and reduces nitrogen fixation capacity.

    4. The nitrate nitrogen fertilizer should not be applied to the rice fields. Ammonium nitrate, sodium nitrate, etc. will dissociate nitrate ions, which are easily leached to the deep layers of the soil, causing denitrification and loss of nitrogen. The application of nitrate nitrogen fertilizer in dry land should not be used before or after watering.

    5. Ammonium sulfate should not be applied for a long time. Ammonium sulfate is a physiological acid fertilizer. When applied in the same soil for a long time, it will increase its acidity and destroy the aggregate structure. In alkaline soil, the ammonium ion of ammonium sulfate is absorbed, and the acid ion remains in the soil. It reacts with calcium to make the soil compacted.

    6. Ammonium bicarbonate should not be applied shallowly. It should be applied deep below 6 cm and covered immediately after application. It should not be used in the greenhouse. Because ammonium bicarbonate is commonly called gas fertilizer, it is easily decomposed into ammonia gas in the greenhouse to volatilize, causing waste; and when the ammonia concentration is too large, it will also burn crop leaves.

    7. Potassium fertilizer should not be applied in the late stage of crops. Potassium can be transferred from the lower stems and leaves of the crop to the top part of the crop for reuse. The symptoms of potassium deficiency are later than those of nitrogen deficiency and phosphorus deficiency. Potassium fertilizer is best applied as a base fertilizer at one time, or applied at the seedling stage.

    8. Containing chlorinated fertilizers such as potassium fluoride and ammonium chloride, avoid applying to saline-alkali soil and avoiding chlorine crops. Chloride ions in chlorinated fertilizers will accumulate in the soil, leading to acidification of the soil. Application in saline soils will aggravate salt damage; application on chlorine-free crops will affect yield and quality.