Commonly used fertilizer efficient application points

Commonly used fertilizer efficient application points

1.Urea urea is a high-concentration amylamide nitrogen fertilizer. At present, it is the highest nitrogen fertilizer in China's solid nitrogen fertilizer. It is a neutral and available fertilizer. It will be converted into soil through soil microbes after 3 to 4 days after being applied to the soil. Ammonium carbonate or ammonium bicarbonate can only be absorbed and utilized by crops. Therefore, as a basal fertilizer to deepen, but also than ammonium bicarbonate, ammonium sulfate applied early 4 to 5 days. Urea is molecular before conversion and cannot be adsorbed by the soil and should be prevented from losing water. The ammonia formed after the conversion is also volatile, so urea should also be deeply applied to the soil, and should not be immediately after the application of irrigation, if the irrigation immediately after irrigation easily make urea with water loss, should be spaced 4 to 6 days after irrigation. Urea should not be directly used as seed fertilizer, because high concentrations of urea are directly contacted with seeds, often affecting seed germination, resulting in uneven seedlings. When urea is used as foliar fertilizer, the concentration must be strictly controlled. Generally, the concentration of gramineous crops is 1.5% to 2%, that of fruit trees is 0.5%, that of open-air vegetables is 0.5% to 1.5%, and that of greenhouse vegetables is between 0.2% and 0.3%. For highly productive crops or adult fruit trees, the concentration of urea applied can be appropriately increased.

2. Ammonium bicarbonate is abbreviated as ammonium bicarbonate with a nitrogen content of about 17%, which is the lowest nitrogen content in solid nitrogen fertilizer. Ammonium bicarbonate generally has a water content of 5% to 6%, is easily deliquescent, and is easy to agglomerate. Below 20°C, the temperature is still relatively stable. If the temperature is slightly higher or the moisture in the product exceeds a certain standard, ammonium bicarbonate will be decomposed into ammonia gas and carbon dioxide. The gas will dissipate in the air, causing a loss of nitrogen fertilizer efficiency. It is a physiologically neutral and readily available nitrogen fertilizer that is suitable for all kinds of crops and all kinds of soils. It can be used as base fertilizer and top dressing. When ammonium bicarbonate is used as a basal fertilizer, it can be applied or applied. If it can be combined with intensive cultivation, its effect will be better. However, it should be noted that the depth of application should be greater than 6 cm (the sandy soil can be deeper), and immediately after the application, the soil should be covered. Only in this way can the loss of nitrogen be reduced. When ammonium bicarbonate is used as topdressing, the dry fields can be combined with cultivator, and the depth should be less than 2 inches, and the soil should be immediately buried. The paddy field should maintain a shallow water layer of about 1 inch, but it should not be too shallow, otherwise it will be easy to injure the roots, and it should be carried out promptly after application so that the fertilizer is well absorbed by the soil. When you use ammonium bicarbonate as a top dressing, remember not to spread it just after it has rained or before the dew has dried up. Ammonium bicarbonate should not be used as base fertilizer or topdressing fertilizer and should not be applied on the surface of the soil to prevent the nitrogen from evaporating and causing loss of nitrogen or injuring crops. At the same time to avoid the application of high temperature season and high temperature period, as far as possible in the season when the temperature is lower than 20 °C.

3. Diammonium Phosphate Diammonium Phosphate is a high-concentration, quick-acting fertilizer suitable for a variety of crops and soils. It is particularly suitable for hi-ammonium phosphorus-requiring crops and should be used as a base fertilizer. If it is top-dressing, it should be applied early and deep. 10 centimeters after the cover soil, not too close to the crop, so as not to burn the crop. When used as a fertilizer, it cannot be in direct contact with the seeds. Do not use diammonium phosphate with water, otherwise most of the nitrogen will remain on the surface, and do not mix with alkaline fertilizers such as grass ash and lime to prevent the volatilization of nitrogen and reduce the effectiveness of phosphorus.

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