Foliar Fertilizer For Vegetables

How to choose and use leaf fertilizer for vegetables?

At present, there are many kinds of foliar fertilizers in the market, with different chemical compositions, properties and uses. The foliar fertilizers suitable for vegetables are naturally different.

Vegetables that mainly eat stems and leaves, such as Chinese cabbage, cabbage, spinach, celery, bamboo shoots, leeks and other vegetables, like nitrogen. Leaf fertilizer is generally dominated by water-soluble fertilizers such as urea and ammonium sulfate. The concentration of urea is controlled within 2%, and the concentration of ammonium sulfate is controlled within 1.5%. Generally, it is sprayed 2-3 times in the whole growth period, and 500 times of edible vinegar is added when spraying. The effect is more significant.

Tomato, pepper, eggplant and various melon and fruit vegetables, leaf fertilizer should be mainly nitrogen phosphorus potassium mixed fertilizer or multi-element compound fertilizer, such as 0.3% potassium dihydrogen phosphate, 1% urea plus 2% calcium superphosphate (leaching solution) plus 0.5% potassium sulfate solution and 0.08% ammonium molybdate. Generally, the fertilizer can be sprayed once at the early and late stages of vegetable growth.

Root and stem vegetables such as garlic, onion, radish, potato, taro, etc. need more phosphorus and potassium. Generally, leaf fertilizer is mainly phosphorus and potassium fertilizer, such as 0.3% potassium dihydrogen phosphate solution, calcium superphosphate and plant ash immersion solution, which are sprayed 3-4 times per season. According to the experiment, spraying 0.2% borax solution on root vegetables can effectively prevent the occurrence of physiological diseases; Spraying 0.1% zinc sulfate and 0.2% ammonium molybdate mixed solution on potatoes had a significant effect on tuber expansion and quality improvement.

Selection of spraying time of this product:

Foliar fertilization, as a supplement to soil fertilization, can not replace soil fertilization. However, when the vegetables are in adversity and the root system is difficult to absorb nutrition, the effect of using leaf fertilizer is obvious. For example, the effect of foliar fertilizer spraying will be better if there is a lack of certain elements, poor soil environment, low humidity, root injury and blocked absorption. In production, we can judge whether it is suitable to spray foliar fertilizer according to the growth of vegetables. If the vegetables grow luxuriant branches and leaves, with many flowers and strong fruits, it means that the fertilizer and water supply is sufficient and the growth is good, so it can be sprayed less or not; In case of etiolation, small flowers and fruits, serious diseases and insect pests, hindered growth, poor growth, etc., it indicates that the vegetables are lack of fertilizer and elements. At this time, it is necessary to carefully find out the causes, apply fertilizer according to the symptoms, and timely supplement the required nutrients. In case of navel rot of tomatoes, calcium fertilizer should be considered. In case of bare melons in cucumbers, nitrogen control and phosphorus and potassium fertilizer should be adopted.

The selection of this product should be targeted:

The nutrient elements of leaf fertilizer are mainly to make up for the lack of soil fertilization, or to balance crop nutrition, or to alleviate the temporary shortage of nutrients in a certain growth period of crops. Therefore, the selection of leaf fertilizer should be targeted. For example, in the case of insufficient application of base fertilizer, leaf fertilizer based on nitrogen, phosphorus and potassium can be selected; When the base fertilizer is sufficient, leaf fertilizer with trace elements as the main fertilizer can be selected. In addition, there are differences in the proportion and amount of nutrients required by vegetables at different growth and development stages. Generally, the amount of fertilizer required in the seedling stage is small, and the amount of fertilizer required in the flowering and fruiting stage is large. Therefore, when applying foliar fertilizer, it is necessary to spray a small amount of small leaves in the early stage, supplement nutrients and promote the seedling to be strong, and spray more in the middle and late stages of growth to prevent premature senescence and promote high yield.

Spraying concentration of this product:

Within a certain concentration range, the speed and quantity of nutrients entering leaves increase with the increase of solution concentration, but too high concentration is prone to fertilizer damage. Especially for trace element fertilizers, the concentration is too low, the amount of nutrient elements in contact with crops is small, and the use effect is not obvious; Too high concentration will often burn leaves and cause fertilizer damage. The critical range of trace elements from lack to excess is very narrow, which should be strictly controlled. The spraying concentration of the same fertilizer on different crops is also different, which should be determined according to the type of crops. Foliar fertilizer containing growth regulators should also be sprayed in strict accordance with the concentration requirements in the instructions to prevent harm caused by improper regulation.

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