How long is the foliar fertilizer not afraid of rain

To see the introduction of foliar fertilizer, if there is no special mark, there is no need to re-spray, if the notes are marked, 4-6 hours after spraying should be supplementary spray instructions, you need to re-spray. It usually takes 4-5 hours after the game is played before it is not afraid of rain.

Matters needing attention in spraying foliar fertilizer

1. Select the appropriate spray concentration. Foliar fertilization concentration is directly related to the effect of spraying, if the solution concentration is too high, it is easy to burn crop leaves after spraying; too low solution concentration not only increases the workload, but also can not meet the requirements of supplementary crop nutrition. Therefore, in the application, it should be prepared according to local conditions because of fertilizer and different crops.

2. Choose the appropriate spraying method. The preparation of the solution should be uniform, the spray point should be even and fine, and the spraying times should be needed.

3. Master the spraying period. In the period of foliar fertilization, according to the demand for nutrient elements in different growth and development stages of various crops, we should choose the most urgent and most urgent time to spray crop nutrient elements in order to achieve the best effect.

4. Choose the appropriate spraying time. The effect of foliar fertilization is directly related to temperature, humidity and wind. Foliar spraying is best chosen before 9: 00 in the morning when there is no wind or cloudy days with high humidity and low evaporation, and the most suitable one is after 4: 00 p. M. if it rains 3-4 hours after spraying, supplementary spraying is needed.

5. Select the appropriate spraying site. Due to the different metabolic activity of the upper, middle and lower leaves and stems of the plant, the ability of absorbing nutrients to the outside world is quite different, so the appropriate spraying site should be selected.

6. Add auxiliaries. When spraying fertilizer solution on the leaf surface, proper auxiliaries should be added to improve the adhesion of fertilizer solution on plant leaves and promote the absorption of fertilizer.

7. Combined with soil fertilization. Because the root has a larger and more perfect absorption system than the leaf, it takes more than 10 times of foliar fertilization to reach the total amount of nutrients absorbed by the root for a large amount of nutrient elements such as nitrogen, phosphorus, potassium and so on. Therefore, foliar fertilization can not completely replace the root fertilization of crops, and must be combined with root fertilization.

8. Soak extraction. From the point of view of agricultural production cost, the effect of use is higher than that of soil fertilization. The dried fermentation material is moved to a container and soaked in 5% brown sugar water to extract amino acid water. The soaking ratio is 1 kg soybean powder plus 5% brown sugar water 5 kg, the soaking time is 5-15 days, after soaking (no odor, the liquid is dark brown), the amino acid water should be extracted by vacuum pump in time, packed and kept in a cool place.