Precautions for the application of large quantities of elemental water-soluble fertilizer in drip irrigation

The application of a large amount of elemental water-soluble fertilizer with drip irrigation is a more common method in production at present:

1. Fight back and forth. Drop water first, and add fertilizer after the pipe is filled with water to avoid no fertilizer in the front section; Immediately after fertilization, drop water for 20-30 minutes to discharge all the residual fertilizer in the pipeline (the conductivity meter can be used to monitor whether it is discharged); If the tube is not washed, lower plants or microorganisms such as moss and algae may grow on the dropper, blocking the dropper and damaging the equipment.

2. Prevent the accumulation of salt on the surface. Long-term fertilization with drip irrigation in greenhouses or greenhouses will cause the accumulation of salt on the surface and affect root growth. Salt migration to surface can be inhibited by submembrane drip irrigation.

3. Be even. In the principle of paying attention to uniform drip irrigation fertilization, the slower the fertilization, the better. Especially for elements with poor mobility in the soil (such as phosphorus), extending the fertilization time can improve the utilization rate of difficult to move nutrients. In the dry season, it is recommended that the fertilization time be 2-3 hours to complete. Under the condition that the soil does not lack water, the sooner the better on the premise of ensuring uniformity.

4. Avoid excessive irrigation. When the main purpose of irrigation is fertilization, the depth of the root layer can be moistened. The depth of the root layer of different crops varies greatly, and you can dig up the soil at any time with a shovel to find out the exact depth of the root layer. Excessive irrigation not only wastes water, but also causes nutrients to seep out below the root layer, which can not be absorbed by crops and wastes fertilizer. In particular, urea, nitrate nitrogen fertilizer (such as potassium nitrate, calcium ammonium nitrate, nitrophosphate fertilizer and water-soluble fertilizers containing nitrate nitrogen) are easily lost with water.

5. Cooperate with application. A large amount of elemental water-soluble fertilizer is a quick-acting fertilizer and can only be used as topdressing fertilizer. In conventional agricultural production, water-soluble fertilizers cannot replace other conventional fertilizers. Therefore, in the production, it is necessary to combine base fertilizer with topdressing, organic fertilizer with inorganic fertilizer, and water-soluble fertilizer with conventional fertilizer in order to reduce costs and play the advantages of various fertilizers.