Foliar Fertilizer For Cotton

Selection：

1.1 seedling stage

In the case of applying sufficient base fertilizer, strong seedlings can not spray foliar fertilizer for cotton. Weak seedlings were sprayed with a small amount of N, P, K and other large elements for many times.

1.2 later stage

When cotton enters the period of vegetative growth and reproductive growth, when the base fertilizer is sufficient, the strong seedlings can be sprayed with an appropriate amount of plant growth regulator. At the same time, the foliar fertilizer for cotton dominated by trace elements can be selected. For example, the falling of cotton buds and bolls is related to the lack of boron nutrition, so boron fertilizer is generally sprayed 2 ~ 3 times in the current bud period; At the same time of spraying plant growth regulators, the flourishing seedlings were regulated by delaying the use of fertilizer and water and reducing the use of N fertilizer; In the middle and late stage of weak seedlings, under the condition of sufficient Topdressing and timely irrigation. A proper amount of N, P, K and other elements were sprayed on the leaves.

1.3 cotton later stage

According to the seedling condition, cotton fields with signs of premature senescence can be sprayed with an appropriate amount of nutritional foliar fertilizer for cotton to prevent premature senescence.

Application and precautions:

2.1 Application period

From the perspective of crop growth stage, it is mainly from the stage of vigorous vegetative growth to the stage of simultaneous vegetative growth and reproductive growth. The use effect of cotton in the middle growth stage is greater than that in the later dry stage, so foliar fertilizer for cotton should be used from the end of June to the beginning of August.

2.2 Application plot

Foliar fertilizer for cotton is generally applied in the following plots with good effect: first, the plots with poor crop root growth after flood disaster, and the plots with insufficient base fertilizer and late fertilizer removal; Second, plots where crops are prone to or have some symptoms of deficiency; Third, the plots that suffer from diseases and insect pests and need to be restored as soon as possible; The fourth is to obtain high-yield and effective plots.

2.3 Application Time

Fertilizer spraying weather should be in cloudy or sunny morning when the dew is dry or after 4 p.m. to avoid high-temperature and strong light at noon, so as not to affect the fertilizer absorption effect or burn the leaves too quickly. In the weather with excessive wind speed, the effect of leaf fertilizer is not ideal. When applying fertilizer on the leaf surface, generally, the leaf should be kept wet for 30 ~ 60min. If it rains 3 hours after spraying, spray again on a sunny day, but the concentration should be appropriately reduced.

2.4 Applicable concentration

The amount and concentration of foliar fertilizer are also different for different crop types. The amount of liquid fertilizer is 45 ~ 55 kg, and the concentration is 0.5% ~ 1%, or it is carried out in strict accordance with the requirements of the operation manual. Spray once every 5 ~ 7 days, 2 ~ 3 times in total. Some adhesion agents, such as washing powder and soap liquid, can also be added to enhance the adhesion of liquid fertilizer on the leaf surface and prolong the fertilizer absorption time of the leaf.

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