Some fruit farmers are eager to pursue production, relying on chemical fertilizers one-sidedly, and only paying attention to the application of a large number of elements such as nitrogen fertilizer, lacking the balanced supply of medium and trace elements, and not paying attention to the application of organic fertilizers for a long time, so the orchard is not only unstable, but also often A kind of physiological disease phenomenon, a kind of physiological disease commonly found in fruit tree production is caused by the lack of trace elements such as calcium, magnesium, boron and zinc. For example, in northern orchards, apples, pears, and peaches often have yellow leaf disease that is found to be deficient in iron; zinc leaf disease and boring heart disease; and apple trees are also suffering from calcium deficiency. In southern orchards, citrus and lychee are often found in recent years due to lack of boron or zinc deficiency, and fruit drop and new shoot yellowing.
   For the fruit trees in the fruiting period, the application of nitrogen, phosphorus and potassium in large amounts of elemental fertilizers is mainly through soil fertilization, supplying root nutrients, and supplementing the deficiency of medium and trace elements, and also through the method of topdressing. The advantages of foliar fertilization are: direct supply of above-ground nutrients, rapid utilization, avoiding the fixed nutrients of fertilizers being fixed and degraded in the soil, and the nutrient utilization efficiency of foliar fertilization is higher than that of soil fertilization, which can directly and effectively solve trace elements. The problem of deficiency. Of course, its shortcoming is: the fertilizer effect is limited for a short time, it is a kind of auxiliary fertilization. Sometimes, for soils that are seriously lacking in certain medium and trace elements, soil fertilization is also required to have a significant effect.
   The mechanism of the effect of spraying the trace element fertilizer on the surface of the leaves is that the tree is tall and has the characteristics of perennial and strong planting. Most of the orchards are distributed on sandy beaches, sloping fields and fertile soils. In the management of orchards, the “three elements of fertilizers†of NPK are often supplied through a large amount of soil fertilization, while the medium and trace elements consumed for many years are not available. Corresponding return and supplement. In addition, in recent years, the area of ​​orchard has expanded rapidly, and the application of organic fertilizer has not kept up, which has aggravated the contradiction between insufficient elements and trace elements. Especially the promotion of high-yield tree species and the introduction of exotic tree species, their demand for medium and trace elements are more, which has increased the demand for the increase of the demand for medium and trace elements in fruit trees and the urgency of fertilization. In addition, from the analysis of the nutritional characteristics of fruit trees, the micro-fertilizer applied by the soil is long from the roots of the fruit trees to the leaves, and it is more difficult to transport and redistribute over long distances. Therefore, foliar spray is an effective method to correct the deficiency of trace elements in fruit trees. In addition, the demand for trace elements in fruit trees is small. If the method of soil application is adopted, the amount of fertilizer applied is small, the application is uneven, the cost is high, and the utilization rate is low.
   In order to achieve the desired effect of fruit tree spray fertilizer, the following technical essentials are required:
   1. The choice of fertilizers is mainly to supply the lack of medium and trace element fertilizers. Do not choose the so-called "Tenquan" large fluid, which is expensive and non-targeted, but not effective. Therefore, it can be based on simple fertilizer.
   2. The concentration is suitable, too low to achieve the effect, too high will produce fertilizer damage, the optimum concentration will vary depending on the target crop, growth period and element type.
   3. The number of spraying, fruit tree spray fertilizer usually spray twice to be effective. In case of special problems such as disasters or obvious symptoms, spray 3 to 5 times.
   4. Spraying parts, the front and back of the leaves, stems and young fruits can be sprayed, but the spraying of flowers and buds should pay special attention to the concentration. The back of the leaves has more stomata than the front and absorbs more.
   5. Spray time, avoid wind, rain and noon time. It is advisable to go before 10 o'clock in the morning and after 4 o'clock in the afternoon .
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