What should we pay attention to when fertilizing the foliage of crops?

What should we pay attention to when fertilizing the foliage of crops? Please guide the foliar fertilization of crops to pay attention to the following ten points: 1. Foliar fertilization has the advantages of low dosage, strong pertinence, fast absorption, obvious effect and low cost, especially for crops with few roots. The author introduces the ten key points of crop foliar fertilization summarized in practical application as follows: 2. Spraying should be targeted. That is, according to the nutrients needed by the plant in each growth period, choose the corresponding fertilizer, targeted supply. For example, nitrogen fertilizer is the main fertilizer in the new bud growth period, and potash fertilizer is needed to work at the same time; potash fertilizer should be added when the new seedling is mature to ensure the plant to grow healthily; phosphate fertilizer should be added at the blooming stage. 3. The variety of fertilizer should be suitable. The varieties of leaf fertilizer commonly used in production are urea, potassium dihydrogen sulfate, potassium sulfate and so on. These fertilizers have the characteristics of stable performance and no damage to leaves. In addition, according to the study, the permeability of fertilizer on the leaf surface directly affects the effect of foliar topdressing. At present, it is recognized that urea as foliar topdressing is the most ideal at home and abroad. 4. The mixed use of leaf fertilizer should be proper. Although the commercial foliar fertilizer content is more complete, but do not always use the same variety, should be mixed and used alternately, learn from each other to make nutrition more comprehensive. In foliar topdressing, if two or more kinds of foliar fertilizers are mixed reasonably, the effect of increasing yield will be more significant, and the spraying time and labor can be saved. 5. The spraying concentration should be appropriate. Foliar topdressing must control the spraying concentration, use the concentration in strict accordance with the relevant instructions, it is forbidden to increase the concentration at will, otherwise it will be counterproductive, resulting in fertilizer damage, resulting in unnecessary losses. Especially for trace element fertilizers, the critical range of crops from lack to excess is very narrow and should be strictly controlled. 6. the spraying time should be suitable. Foliar topdressing is best carried out in windless weather in the evening. Spraying fertilizer in the morning with dew will reduce the solution concentration and affect the effect of fertilization. Foliar topdressing can not be carried out on rainy days or before rain, because nutrients are easily leached by Rain Water and can not play a due role. 7. The spraying method should be exquisite. Because the fertilizer should be absorbed into the body through the leaf stomata, the leaf stomata are mainly on the back of the leaves, so the spray is mainly sprayed on the back of the leaves, the nozzle should be upward, and the fog point should be fine. At the same time, the amount of spraying should not be too large, and it is better to keep the leaves from dripping, so as to prevent the accumulation of fertilizer liquid from the tip of the leaf. 8. The spraying times should be reasonable. The concentration of foliar topdressing of crops is generally low, and the amount of absorption is very small, so the frequency of foliar topdressing should not be less than 2-3 times. 9. Spray evenly and meticulously. Foliar topdressing requires small droplets and uniform spraying, especially paying attention to spraying the exuberant upper leaves and the back of leaves. Because the new leaf than the old leaf, the back of the leaf absorbs nutrients faster than the front, and the absorption capacity is stronger. 10. The fat liquid should be added with wetting agent. There is a stratum corneum with different thickness on the leaves of crops, so it is difficult to penetrate the solution. For this reason, an appropriate amount of pesticide synergist or wetting agent (such as neutral soap, good quality detergent) can be added to the leaf fertilizer solution to reduce the surface tension of the solution, increase the adhesion of the agent and improve the effect of foliar topdressing. Click to get more foliar fertilizer application methods