Foliage fertilizer can't be sprayed every 3 days 1 time. It is best to spray 1 time foliar fertilizer in about 7- 10 days, and it takes 15-20 days if it is drip irrigation. Pay attention to control the concentration of fertilizer, and the concentration should not be too high to avoid fertilizer damage. The optimum temperature of foliar fertilizer is about 18-25℃. Too high or too low temperature is not conducive to plant absorption. The fertilization time of foliar fertilizer is sunny or cloudy every day, and the weather forecast should be seen before topdressing to prevent it from raining after spraying.

1. Can foliar fertilizer be sprayed once every three days?

1, foliar fertilizer cannot be sprayed 1 time for 3 days. Generally, foliar fertilizer is sprayed 1 time every 7 7- 10/day. If drip irrigation is selected, it will take about 15-20 days, but the specific spraying times must be determined according to the plant growth and soil fertility. Foliage fertilizer is not sprayed as often as possible, but too many times will cause fertilizer damage. Crops with short growth period can generally be sprayed 1-2 times, and crops with long growth period can be sprayed about 2-3 times.

2. When using foliar fertilizer, we must pay attention to control the fertilizer concentration, and the concentration should not be too high to avoid fertilizer damage. What is the optimum temperature for using foliar fertilizer? C or so, too high or too low temperature is not conducive to plant absorption. When spraying foliar fertilizer, in addition to spraying it on the leaf surface, we should also pay attention to the back of the leaf, because there are many pores on the back of the leaf, which is easier to absorb.

3. The daily use time of foliar fertilizer is usually sunny or cloudy. Be sure to watch the weather forecast before topdressing to avoid the phenomenon of re-spraying caused by rain after spraying. If the crop is planted in the open air, it can be sprayed before sunset in spring, summer and autumn 10. In winter, the spraying time of greenhouse crops is mainly from 10 to 4: 00 pm, which is affected by temperature, because the temperature in the greenhouse is higher in these six hours, and spraying at this time is more conducive to crop absorption.

Second, what is foliar fertilizer?

1, foliar fertilizer is a kind of fertilizer that can be directly used on leaves. It can make up for the deficiency of nutrient absorption by roots, but it can't replace fertilizer in soil. Spraying foliar fertilizer can quickly supplement nutrition and give full play to the role of fertilizer. If the root system is fertilized, it will be easily fixed by the soil, which will also affect the effect of fertilizer. Foliage fertilizer can reduce soil pollution.

2, the use of foliar fertilizer must be targeted, generally in the case of insufficient base fertilizer, you can use foliar fertilizer based on nitrogen and phosphorus fertilizer. When all base fertilizers are applied, foliar fertilizers mainly containing trace elements can be selected, or foliar fertilizers containing growth regulators can be selected according to different needs of crops.

3. Before using foliar fertilizer, you must choose the one with good quality. When buying foliar fertilizer, we should pay attention to whether the trademark, enterprise standard number, product quality certificate, agricultural registration certificate, factory name, address and production date on the packaging bag are complete, and also check whether the packaging is in good condition. Pay attention to the solubility of liquid fertilizer and whether there is precipitation.