Improper use of foliar fertilizer is prone to drug damage how to spray tomato foliar fertilizer

Foliar fertilization of tomato is quick, simple and easy to operate, and can increase tomato yield. However, improper use, it is also prone to drug damage, so tomato foliar fertilization should pay attention to the following problems:

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I. the types of foliar fertilizer are determined according to the nutritional status of tomatoes.

In the early stage of tomato fruiting, the plant is prosperous and easy to grow, and the foliar nutrient fertilizer to promote stem and leaf growth should be used less, such as compound fertilizer, potassium dihydrogen phosphate and so on. the foliar nutrient fertilizer to promote stem and leaf growth should be used to promote seedling and protect leaves, and urea, potassium dihydrogen phosphate and all kinds of special nutrient solution for tomato leaf surface can be selected.

The types of nutrition are determined according to the weather conditions

The effect of titanium micro-fertilizer on tomato leaf is better because of continuous overcast weather, photosynthesis and lack of light in greenhouse.

Third, the concentration of foliar fertilization should be mastered well.

Too high concentration of foliar fertilizer produces fertilizer damage and toxicosis, but too low concentration of topdressing can not be achieved. The appropriate concentration of commonly used fertilizers for tomatoes is as follows: potassium dihydrogen phosphate 0.2%, urea 0.5%, calcium chloride 0.3%, 0.5%, magnesium sulfate 0.1%, borax 0.01%, zinc sulfate 0.2%, etc.

IV. Timely spraying calcium fertilizer on tomato leaves

Tomato is prone to navel rot due to calcium deficiency. Calcium fertilizer such as calcium chloride should be sprayed in order to meet the need of calcitonin in tomato.

5. the application time of tomato foliar fertilizer should be suitable.

It should be sprayed early and late to avoid burning leaves and seedlings. The spraying time of organic nutrients is shorter than that of tomato foliar fertilizer spraying every 5 minutes for 7 days, which is about 5 days.

6. the foliar fertilizer of tomato should be sprayed mainly on the back of the leaf.

Because the stomata and water pores of tomato are mostly on the back of the leaves, the absorption rate of leaf fertilizer sprayed on the back of tomato leaves is high.