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Spraying should be targeted. That is to say, according to the nutrients needed by the plants in each growth period, the corresponding fertilizers are selected and targeted for replenishment. For example, in the growth period of new shoots, nitrogen fertilizer should be used, and potassium fertilizer should be used at the same time. When the new seedlings mature, potassium fertilizer should be added to ensure that the plants thrive;
Fertilizer varieties should be suitable. The commonly used leaf fertilizer varieties in production include urea, potassium dihydrogen sulfate, potassium sulfate and the like. These fertilizers are characterized by stable performance and no damage to the leaves. According to another study, the penetration of fertilizer on the leaf surface directly affects the effect of foliar topdressing. At present, it is recognized that urea is the most ideal for foliar topdressing at home and abroad.
Leaf fertilizer should be used properly. Although the commercial foliar fertilizer is more comprehensive, do not always use the same variety, should be mixed and alternately used, to learn from each other, to make nutrition more comprehensive. When foliar topdressing, two or more foliar fertilizers can be reasonably mixed, and the yield increase effect will be more significant, and the spraying time and labor can be saved.
Spray concentration should be appropriate. Foliar topdressing must control the spraying concentration. The concentration should be strictly in accordance with the relevant instructions. It is strictly forbidden to increase the concentration arbitrarily. Otherwise, it will be counterproductive, causing fat damage and causing unnecessary losses. Especially for trace element fertilizers, the critical range between crops from lack to excess is narrow and more strictly controlled.
Spray time should be appropriate. Foliar topdressing is best carried out in the windless weather in the evening. Spraying fertilizer in the morning with dew will reduce the concentration of the solution and affect the fertilization effect. Foliar topdressing cannot be carried out on rainy days or before rain, because nutrients are easily leached by rain and do not function as they should.
Spraying methods should pay attention to it. Because the fertilizer should be absorbed into the body through the stomata of the blade, the stomata of the blade are mainly in the back of the leaf, so the spray is mainly applied to the back of the blade, the nozzle should be upward, and the fog point should be fine. At the same time, the spray volume should not be too large, so that the leaves do not drip as well, in order to prevent the accumulation of the tip of the fertilizer to produce a fat burning tip.
The number of sprays should be reasonable. The concentration of crop topdressing is generally low, and the amount of absorption per time is very small. Therefore, the number of foliar topdressing should not be less than 2 to 3 times.
Spray evenly and carefully. Foliar top dressing requires fine droplets and even spray, especially pay attention to spraying the upper leaves and the back of the leaves. Because the new leaves are faster than the old leaves and the back of the leaves than the positive ones, the absorption capacity is strong.
Wetting agent should be added to the fertilizer. There is a thick layer of stratum corneum on the leaves of the crop, and solution penetration is difficult. To this end, an appropriate amount of pesticide synergist or wetting agent (such as neutral soap, better 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 foliar top dressing. Effect.
Foliar fertilization has the advantages of low dosage, strong pertinence, fast absorption, obvious effect and low cost, especially for crops with less roots. The author will now introduce the ten points of crop foliar fertilization summarized in the practical application as follows:
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