Foliar fertilization has the advantages of low dosage, strong pertinence, fast absorption, obvious effect and low cost, especially for crops with less roots. The ten points of crop foliar fertilization summarized in practical application are as follows: 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.
Related reading: Precautions for foliar fertilizer and pesticide mixing
In vegetable production, vegetable farmers often mix pesticides with foliar fertilizers in order to save trouble, but farmers must be reminded that all fertilizers or pesticides can be mixed and sprayed. Therefore, you should read the instructions carefully before mixing to see if the drug system can be mixed. Let's take a look at the precautions for mixing foliar fertilizers and pesticides. I hope it will help.
First, to ensure the shape of the foliar fertilizer and pesticides after mixing
This is because foliar fertilizer may chemically or physically react with pesticides, affecting the effectiveness of pesticides or causing phytotoxicity. If the liquid has poor performance, it is not suitable for mixed use. Even if the physical properties of the drug solution are good after mixing, it is necessary to carry out a small-scale test first to see if it is prone to damage and phytotoxicity, and then use it in a large area. For example, foliar fertilizers containing boric acid, ferrous sulfate and the like are mostly acidic, while copper preparations such as copper hydroxide are alkaline. If mixed, it is easy to react and affect each other.
Second, the order of mixing foliar fertilizers and pesticides should pay attention to
Generally, a sufficient amount of water is first prepared with a single dose of the drug solution, and then the other solution is diluted with the solution; instead, the two single agents may not be mixed first, and then diluted with water to avoid adverse reactions, resulting in effective Destruction of ingredients and deterioration of physical properties.
When foliar fertilizer is mixed, the order of foliar fertilizer and pesticide is usually: foliar fertilizer, wettable powder, suspending agent, water agent, and emulsifiable oil are added in sequence, and each one is added, then fully stirred and mixed, and then the next one is added. .
Third, pay attention to the use of water when mixing
Water has a great influence on the liquid medicine, and the pH and ion concentration of the water will affect the effect. It is better to use medicinal water with neutral water with low ion concentration, such as clean rain water and river water.
Fourth, pay attention to the current use
Although the drug solution has no adverse reaction at the time of the formulation, it is easy to produce a slow reaction for a long time, which may result in loss of efficacy or susceptibility to phytotoxicity. If some pesticides are stable under weak alkaline conditions, they should also be used immediately. If they are placed for a long time, they will be ineffective.
Fifth, pay attention to acidity and alkalinity.
It is also necessary to test whether flocculation, precipitation or discoloration occurs, and bubbles are generated after mixing. If the liquid has poor performance, it is not suitable for mixed use. Even if the physical properties of the drug solution are good after mixing, it is necessary to carry out a small-scale test first to see if it is prone to damage and phytotoxicity, and then use it in a large area.
Recommended reading: Precautions for using jujube fertilizer for jujube
Planting jujube and topdressing has always been an important way to increase production. So what is the foliar fertilizer in the jujube flowering period? What are the concentration problems and usages? Please share with your own experience how to spray the leaves on the jujube trees. Face fat? I hope to help everyone.
Regular characteristics of jujube flowering period:
1. Jujube has a long flowering period, more flowering, and higher nutrient consumption. If jujube trees need insufficient nutrients and nutrient supply, they consume a lot of nutrients, and the flowering period will cause dust and flowers, which will cause a lot of fruit drop.
2, flowering water jujube tree flowering often encounters high temperature and dry weather, it is easy to cause the jujube stigma to wither and fall off, should spray the water on the jujube tree crown during the flowering period, increase the humidity, and promote the jujube pollen germination.
3, flowering ring stripping on the jujube tree has entered the fruiting period, jujube tree age in the 12 to 15 years in the full bloom period of ring stripping.
Method of spraying foliar fertilizer on jujube trees:
1. Spraying period
From the leaf-expansion period, spray twice a month.
2, spraying method
Foliar fertilization should be carried out on a windless sunny day, with the best effect in the evening and morning. During the daytime, the temperature is too high, and the moisture of the leaves is quickly evaporated. The foliar application will affect the absorption and utilization of fertilizers and even cause fertilizer damage. Foliar fertilization has the highest absorption rate on the back side of the leaves, and the method of spraying to the front and back of the leaves should be applied when fertilizing.
3. Fertilization types
In the early stage of growth, nitrogen fertilizer should be the main factor, supplemented by phosphorus and potassium fertilizers; phosphorus and potassium fertilizers should be the main growth stage, supplemented by nitrogen fertilizer. The sprayed micro-fertilizer should be determined by the growth and development of the jujube tree and the soil condition.
4, spray concentration
The concentration of the urea fertilizer solution sprayed is 0.3%-0.4%, the concentration of the potassium dihydrogen phosphate solution is 1%-2%, and the concentration of the ferrous sulfate fertilizer solution is 0.2%-0.4%.
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