Cotton foliar fertilizer selection

Foliar fertilization refers to the action of spraying non-toxic and harmless organic or inorganic nutrient solution containing various nutrients on the leaf surface of plants at a certain dose and concentration to directly or indirectly supply nutrients. Foliar spray fertilizer, also known as root dressing.

 

　　 1 , the type of foliar fertilizer

 

　　 1.1 nutritious foliar fertilizer

 

The nutrient content of N , p , K and trace elements in such foliar fertilizer is high. The main function is to provide various nutrients for crops and improve the nutritional status of crops, especially for the supplement of various nutrients in the late stage of crop growth.

 

　　 1.2 Regulated foliar fertilizer

 

Such foliar fertilizers contain substances that regulate plant growth, such as auxins and hormones, and their main function is to regulate the growth and development of crops. Suitable for pre- and post-plant growth.

 

　　 1.3 bio-foliar fertilizer

 

Such fertilizers contain 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 pests and diseases.

 

　　 1.4 compound foliar fertilizer

 

There are many kinds of such foliar fertilizers, and the composite mixed forms are various. There are many functions, and a foliar fertilizer can provide nutrition and stimulate growth and regulation.

 

　　 2 , the choice of foliar fertilizer

 

　　 2.1 Seedling period

 

In the case of applying the base fertilizer, the strong seedlings may not spray the foliar fertilizer. Wang Miao sprayed the plant growth regulator ketamine several times as appropriate. A small number of weak seedlings are sprayed with a large number of elements such as N , P , and K.

 

　　 2.2 middle and late

 

When cotton enters the period of vegetative growth and reproductive growth, the strong seedlings should be sprayed with plant growth regulators when the base fertilizer is applied adequately. At the same time, foliar fertilizers based on trace elements can be selected, for example, cotton buds and loin and boron nutrition. Insufficient, so generally apply boron fertilizer 2 to 3 times in the bud stage ; Wang Miao is spraying the plant growth regulator, while regulating the delay of fertilizer and reducing the use of N fertilizer; In the case of foot-dressing and timely irrigation. Apply a large amount of elements such as N , P , and K to the appropriate amount of foliage .

 

　　 2.3 Late cotton

 

According to the cotton field with signs of premature aging, it is possible to spray some nutrient-type foliar fertilizer to prevent premature aging.

 

　　 3 , precautions when purchasing foliar fertilizer

 

　　 3.1 look at the package and instructions

 

Regular foliar fertilizers that meet the national quality requirements shall be marked with: product name, name and address of the manufacturer; agricultural registration certificate number, product standard number, active ingredient name and content, net weight, production date; product applicable crops, applicable Area, usage and precautions.

 

　　 3.2 see the dissolution

 

You can mix a bag of foliar fertilizer with about 1kg of water to see its dissolution. If the foliar fertilizer is completely dissolved, there is no precipitation, indicating that the product is of good quality, high effective nutrients, and nutrients are easily absorbed by the crop. If the foliar fertilizer is not completely dissolved, there is sediment under water, indicating that the quality of the product is not good, and it is easy to block the spray nozzle when spraying, and the utilization rate of the nutrients of the crop is not high.

 

　　 3.3 see dosage form and dryness

 

There are two types of solid and liquid foliar fertilizers on the market. Generally, solid foliar fertilizer is superior to liquid foliar fertilizer. Solid foliar fertilizer is divided into two types: granular and powdery. Granular foliar fertilizer is better than powder. Because the granular foliar fertilizer is processed by a special process, it has the advantages of convenient application, high degree of drying and easy storage.

 

　　 4 , the use of foliar fertilizer and precautions

 

　　 4.1 Period of administration

 

From the perspective of crop growth stage, it is mainly the stage of vegetative growth and the stage of vegetative growth and reproductive growth. Cotton growing use of big effect mid-late, late is greater than the early, so it should be better at the end of June to early August mid cotton.

 

　　 4.2 Application plot

 

Foliar fertilizer is generally better applied in the following plots: first, the plots of crop roots that are not growing well after flood disasters, and those that are obviously de-fertilized at the end of the period; second, crops are prone to or have some deficiency The plot of symptoms; the third is the plot to recover from pests and diseases; the fourth is to obtain high-yield and efficient plots.

 

　　 4.3 application time

 

Spraying weather should choose to dry in the morning on a cloudy or sunny day or after 4 pm, avoid high temperature and strong light at noon, so as to avoid the evaporation of liquid fertilizer too fast affecting the effect of sucking or burning the leaves. In the weather with excessive wind speed, the effect of applying foliar fertilizer is not ideal. When foliar fertilization, it is generally preferred that the leaves remain wet for 30 to 60 minutes . If it rains 3 hours after spraying, it should be refilled once on sunny days, but the concentration should be reduced appropriately.

 

　　 4.4 Applicable concentration

 

The amount and concentration of different types of spraying crop foliage which is not the same, an amount of sprayed liquid fertilizer 45 ~ 55kg, a concentration of 0.5% to 1%, in strict accordance with the requirements or instructions for use. Every 5 ~ 7d 1 spray, spray a total of 2-3 times. Some adhesives, such as washing powder, soapy liquid, etc., may be added to enhance the adhesion of the liquid fertilizer on the leaf surface and prolong the suction time of the leaf.

 

　　 4.5 Application method

 

Foliar spray is mainly applied to young leaves, and the back of the leaves is good. Spray on the front and back of the leaves to start dripping. Spray evenly. Pay attention to the foliar fertilizer to be used with it, can not be placed for too long.

 

In order to save labor, some nutrient-type foliar fertilizers can be mixed with plant growth regulators and pesticides, and the number of mixed species should not be too much. In actual operation, do not put several kinds of foliar fertilizer together, do not spray this today, and spray it tomorrow. The application of foliar fertilizer does not have an additive effect, and even more spray effects may affect each other. Generally, 1 to 2 kinds should be selected to be administered according to local conditions.

 

Before mixing the commonly used pesticides and foliar fertilizers, you should do some spot test to determine that it is harmless and does not reduce the efficacy before starting to use.