Walnut foliar spray fertilizer is a very popular fertilization method in recent years. Foliar fertilization has the advantages of less water, less loss, quick effect, high utilization rate, etc. So, how should walnut leaf surface be fertilized? To do a good job in walnut leaf fertilization should pay attention to the following points:
1. Select the appropriate spray concentration. Generally, the nitrogen fertilizer used for foliar application can be 0.3% to 0.5% of urea, the phosphate fertilizer can be 0.5% to 1.0% of superphosphate, and the potassium fertilizer can be 0.2% to 0.3% of potassium sulfate or 1% of ash leaching solution. It can be used to supplement trace elements with 0.1% to 0.2% boric acid, 0.5% to 1.0% ammonium molybdate, and 0.3% to 0.5% copper sulfate. The concentration in the early stage of growth should be thinner and thicker in the later stage.
2. Choose the appropriate spray method. The preparation solution should be uniform, the spray mist should be evenly distributed, and the number of sprays needs to be seen.
3. Master the spraying period. According to the needs of the growth and development of walnuts, they should be sprayed at the flowering stage, the new shoot speed, the flower bud differentiation stage and the harvesting. According to the experience of each place, the spraying of boron or boron plus urea can significantly increase the fruit setting rate. Spraying calcium and potassium fertilizer during the expansion period.
4. Choose the appropriate spray time. For foliar application, it is best to choose no wind or cloudy or high humidity, and the evaporation is small before 9:00 am. It is most suitable to be carried out after 4 pm. If it rains 3-4 hours after spraying, it needs to be Make a spray.
5. Select the appropriate spraying site. The upper leaves or new shoots of walnuts grow vigorously and have strong absorption capacity. The spraying of leaves is concentrated in these parts. The upper and lower sides of the leaves should be sprayed, especially the lower pores and strong absorption capacity.
6. Add auxiliaries. When spraying the fertilizer on the foliar surface, appropriate additives are added to improve the adhesion of the fertilizer solution on the leaves of the plant and promote the absorption of the fertilizer.
7. Combined with soil fertilization. Because the root has a larger and more complete absorption system than the leaf, for large amounts of nutrients such as nitrogen, phosphorus, potassium, etc., it is determined that more than 10 foliar fertilization can reach the total amount of nutrients absorbed by the root. Therefore, foliar fertilization cannot completely replace the root fertilization of crops and must be combined with root fertilization.
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