Essential points for efficient application of chemical fertilizers

August 14, 2019

1. Urea urea is a high concentration of acyl ammonia nitrogen fertilizer. It is currently the highest nitrogen fertilizer in China's solid nitrogen fertilizer. It is a neutral quick-acting fertilizer. After being applied to soil, it should be transformed into soil microbes through 3-4 days. Ammonium carbonate or ammonium bicarbonate can be absorbed and utilized by crops. Therefore, the base fertilizer should be applied deep, and it should be applied for 4 to 5 days earlier than ammonium bicarbonate or Ammonium Sulfate. Urea is molecular in nature before conversion and cannot be adsorbed by soil. It should be prevented from being lost with water. The ammonia formed after the conversion is also volatile, so the urea should be applied to the soil deeply, and it is not suitable to irrigate the water immediately after application. If the water is easily lost after the top dressing, the water should be drained after 4~6 days. Urea should not be used directly as a seed fertilizer, because high concentrations of urea directly contact with seeds often affect seed germination, resulting in seedling irregularities. When urea is used as foliar fertilizer, the concentration should be strictly controlled. Generally, the concentration of grass crops is 1.5%~2%, fruit trees are about 0.5%, open vegetables are 0.5%~1.5%, and greenhouse vegetables are between 0.2%~0.3%. For growing crops, or adult fruit trees, the concentration of urea applied can be appropriately increased.
2. Ammonium bicarbonate is abbreviated as ammonium bicarbonate, and the nitrogen content is 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. The temperature is relatively stable below 20 ° C, 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, and the gas will escape in the air, resulting in nitrogen fertilizer loss. It is a physiologically neutral fast-acting nitrogen fertilizer, suitable for a variety of crops and various types of soil, both as a base fertilizer and as a top dressing. When ammonium bicarbonate is used as the base fertilizer, it can be applied by ditch or acupoint. If combined with the deep application of cultivated land, its effect will be better. However, it should be noted that the application depth should be greater than 6 cm (the sandy soil can be deeper), and the soil should be covered immediately after application, in order to reduce the loss of nitrogen. When ammonium bicarbonate is used as top dressing, the dry land can be combined with cultivating, and it should be applied under 2 inches deep, and the soil should be covered immediately, and watering should be done in time. The paddy field should maintain a shallow water layer of about 1 inch, but not too shallow, otherwise it is easy to damage the roots, and it should be promptly applied after the application to promote the fertilizer to be well absorbed by the soil. When using ammonium bicarbonate as a top dressing, remember not to apply it just after it has rained or before the dew has dried up. Regardless of whether it is base fertilizer or top dressing, carbon ammonium should not be applied on the surface of the soil to prevent nitrogen volatilization, resulting in nitrogen loss or smouldering crops. At the same time, it should be avoided during high temperature seasons and high temperature periods, and should be applied in the season when the temperature is below 20 °C.
3. Diammonium diammonium phosphate is a high-concentration quick-acting fertilizer suitable for various crops and soils. It is especially suitable for crops that require ammonium. It should be used as base fertilizer. For example, for top dressing, it should be applied early and applied deeply. Cover the soil after 10 cm, not too close to the crop to avoid burning crops. When making a seed, it cannot be in direct contact with the seed. Do not use diammonium phosphate with water, otherwise most of the nitrogen will remain on the surface, and should not be mixed 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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