The use of leaf spray fertilizer tips

The use of leaf spray fertilizer tips

With the advent of high temperatures and rainy seasons, farmland crops and economic fruit trees have entered a period of rapid growth. People often find that after the rain, fruit trees in the orchard and even some sidewalk trees on both sides of the road will have regular new leaf yellowing. This type of physiological disease is due to the lack of trace elements such as calcium, magnesium, iron, boron, zinc, etc. Caused. For example, in northern orchards, apple, pear, and peach often have iron deficiency yellow leaf disease, zinc deficiency lobular disease, and boron-deficient rotten heart disease. Apple trees also have calcium deficiency caused by bitter pit disease.

The advantages of leaf spray fertilizer

After confirming that the crop is lacking in trace elements, it is necessary to supplement it with fertilization. The mode of application of micronutrients is different from the mode of application of a large number of elements. The demand for micronutrients in crops is small, and the range of concentrations that can be adapted to them is very narrow. There is no lack of it. Once it is overweight, it will poison. As we all know, the supplement of a large number of elemental fertilizers is mainly through the topdressing of nitrogen, phosphorus and potassium fertilizers (usually calculated in kilograms) to supply nutrients to the roots; and the deficiency of trace elements in the supplementation to crops, except in the case of particularly severe shortage of nutrients, is generally You can use extra-root fertilizer. The advantage of this type of foliar fertilization is that it directly supplies above-ground nutrients and is utilized at a high speed to prevent the effective nutrient of the fertilizer from being fixed and degraded in the soil. The nutrient utilization efficiency of foliar fertilization is higher than that of soil fertilization, which can directly and effectively solve the problem of trace element deficiency. Of course, its disadvantages are: Fertility is limited for a short time and it is a method of assisting fertilization. Sometimes, for soils that are severely deficient in certain trace elements, it is necessary to rely on soil fertilization to achieve significant results.

Why fertilizers perform well in fruit trees

The better mechanism for the effect of trace element fertilizers on leaf surface is that the fruit trees are tall, with characteristics of perennial and strong colonization. Most of the orchards are located in poorly fertile soils such as sandy beaches and sloping fields. In the management of orchards, the “three elements of fertilizers” of N, P, and K are often supplied through large amounts of soil fertilization, but the trace elements consumed for many years are not recovered. With supplements. In recent years, the area of ​​orchards has expanded rapidly, and the application of organic fertilizers has not kept pace, which has also aggravated the contradiction between the shortage of microelements, especially the promotion of high-yielding tree species and the introduction of exotic tree species. Their demand for microelements is high. These all exacerbated the urgency of increasing the demand for trace elements in fruit trees and applying fertilization. From the analysis of the nutritional characteristics of fruit trees, the application of micronutrients in soil from the roots to the leaves of fruit trees is a long process of transportation, and it is more difficult to transport and redistribute them over long distances. In addition, the demand for trace elements in fruit trees is small. If all methods of applying soil are adopted, the amount of fertilizer will be small, and the application will not be uniform, resulting in high cost and low utilization rate. Therefore, spraying foliar fertilizer is an effective method to correct the deficiency of trace elements in fruit trees.

Spray fertilizer technology essentials

In order to achieve the desired effect of sprayed fruit trees, it is necessary to grasp the following technical points:

1. The choice of fertilizer. Mainly targeted supply of missing trace element fertilizers. Do not choose the so-called "Shiquan" liquid supplement, which is both expensive and untargeted, but the effect is not good. Therefore, it can be dominated by simple fertilizers. In view of the complexity of the fertilizer market, when individual farmers purchase micronutrients, they have to buy genuine brands, and they must purchase jointly.

2. The concentration is appropriate. Too low to achieve the effect, too high will produce fertilizer damage, the optimum concentration varies depending on the target crop, growth period and the type of element.

3. Spraying times. Spraying of fruit trees is usually done only two times before they are sprayed; in case of disasters or obvious symptoms, it is necessary to spray 3-5 times.

4. Spray the site. The leaves, stems and young fruits can be sprayed, but the spraying of flowers and buds should pay particular attention to the decrease of the concentration. The number of stomata on the back of the leaf is more than that of the front, and absorption will be more.

5. Spray time. Avoid wind, rain, and noon times. It is better to use before 10 o'clock in the morning before 10 o'clock in the morning.

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