When will the foliar fertilizer be ready? What types do you have? What are the points for attention in spraying?

Foliar fertilization is a supplement for plants to absorb nutrients to make up for the deficiency of root absorption of nutrients, foliar fertilization can not replace soil fertilization. When will the foliar fertilizer be ready? What types do you have? What are the points for attention in spraying?

When will the foliar fertilizer be ready?

The main results are as follows: 1. in spring, summer and autumn, when the new shoots of tea sprouted and grew for the first time, spray it in the early morning, evening or cloudy day on a windless sunny day, spraying 2 or 3 times a week. Spray until the leaves drip.

2. The proportion of N, P and K is 4 ∶ 1 ∶ 1, supplemented by micro-fertilizer. The proportion of micro-fertilizer is based on the principle of what tea plant lacks and what to make up.

3. Fertilization concentration. The concentration of fertilizer is related to the variety of fertilizer and weather conditions. According to the test, urea is 0.5%, calcium superphosphate 1%, potassium sulfate 0.5%, zinc sulfate 50~100ppm, iron molybdate 20~50ppm. If the concentration is too high, it is easy to produce fertilizer damage, otherwise it will not have an effect.

4. The combination of many things. It can be combined with pest control, sprinkler irrigation and plant growth regulators, saving labor and easy to realize mechanization. Chemical properties of fertilizers and pesticides. Acidic chemical fertilizers should be mixed with acidic pesticides, while alkaline chemical fertilizers should be mixed with alkaline pesticides so as not to produce chemical reactions and precipitates, so as to prevent the fertilizer and drug effects from counteracting each other.

5. Biological pesticides are used to control diseases and insect pests. The use of biological pesticides to control tea plant diseases and pests is a safe, reliable, pollution-free, pollution-free, low-cost and high-effective choice, such as Bt emulsion, cyanobacteria, Beauveria bassiana, agricultural antibiotics and plant antibiotics.

What are the usual types of foliar fertilizer?

Foliar fertilizer is a type of fertilizer in which nutrient elements are applied to the surface of crop leaves and play a basic function through the absorption of leaves. There are many kinds of foliar fertilizers. According to their functions and functions, foliar fertilizers can be divided into four types: nutritional type, regulatory type, biological type and compound type. It can be purchased according to the demand in production.

1. Nutritious foliar fertilizer: this kind of foliar fertilizer has high contents of nitrogen, phosphorus, potassium and trace elements, and its main function is to provide various nutritional elements for crops and improve the nutritional status of crops. especially suitable for the supplement of various nutrients in the later stage of crop growth.

2. Regulated foliar fertilizer: this kind of foliar fertilizer contains substances that regulate plant growth, such as auxin, hormones and so on. Its main function is to regulate the growth and development of crops. It is suitable for use in the early and middle stages of plant growth.

3. Biological foliar fertilizer: this kind of fertilizer contains microorganisms and metabolites, such as amino acids, nucleotides and nucleic acids. The main function is to stimulate crop growth, promote crop metabolism, reduce and prevent the occurrence of diseases and insect pests.

4. Compound foliar fertilizer: there are many kinds of foliar fertilizer and various forms of compound mixed fertilizer. It has a variety of functions, a foliar fertilizer can not only provide nutrition, but also stimulate growth and regulate development.

What are the points for attention in foliar fertilizer spraying?

1. Pay attention to the appropriate spraying concentration. As foliar fertilizer is sprayed directly on the upper surface of crops, it is necessary to grasp the concentration of foliar fertilizer. Different foliar fertilizers have different concentrations, different crop species have different spraying concentrations, and the same crop has different spraying concentrations in different growth stages. Therefore, in the foliar fertilizer spraying according to the specific conditions of flexible grasp, the preparation of suitable concentration, the concentration is too low, the effect is not big, the concentration is too high will damage the stems and leaves.

2. Pay attention to the comprehensive spraying site. Many farmers only spray fertilizer solution on the front of the leaves and ignore the back of the leaves, the effect is not ideal. Because foliar fertilizer is mainly absorbed by leaves through stomatal diffusion, and the distribution of stomata on leaves is generally more on the back of leaves than on the front of leaves. Here, when spraying foliar fertilizer, we should pay attention to spraying both positive and negative sides of leaves in order to expand the absorption surface. Dicotyledons should pay more attention to spraying the back of leaves.

3. Pay attention to be reasonable. There is "antagonism" between mixed spraying of phosphorus and zinc, so zinc fertilizer can not be mixed with phosphate fertilizer, and the mixture of zinc fertilizer and phosphate fertilizer is easy to form zinc phosphate precipitate, thus reducing the effectiveness of zinc. There are crops that promote each other between phosphorus and molybdenum, and a legume crop can be sprayed with fertilizer. Copper fertilizer can not be mixed with potassium dihydrogen phosphate, zinc fertilizer and copper fertilizer can not be mixed with calcium superphosphate, generally all kinds of micro-fertilizer can not be mixed with alkaline fertilizer. Note that alkaline and acidic fertilizers can not be mixed, the solution had better be mixed with use, should not be stored for a long time. The frequency of foliar fertilization should not be less than 3 times, the interval is at least one week, and the amount of water is 50kg / mu.

4. Pay attention to the spraying time. Great attention should be paid to the appropriate spraying time, which is related to the effect of spraying. The effect of foliar fertilizer spraying is affected by high temperature, light, intensity, Rain Water and other factors. Spraying should be carried out in a windless sunny day in the morning and evening, and it is best in the evening. Drought, rainy days, strong winds and hot weather are not suitable, and do not spray before rain to prevent fertilizer from being leached by Rain Water and reduce fertilizer efficiency. 4 days after spraying, there is no rain, the wind speed is less than 4 m / s, and the temperature is 8 ℃-25 ℃. Uniform spraying and good atomization are required. If it rains 3 hours after spraying, make up for spraying once on a sunny day, but the concentration should be reduced appropriately. Pay attention to frequent cleaning of spraying utensils so as not to affect the effect of spraying due to pesticide residues.