Matters needing attention in the selection and use of Cotton foliar Fertilizer

For cotton farmers, spraying foliar fertilizer is very important, but many farmers do not know which kind to choose when choosing foliar fertilizer, and they need to pay attention to what they do not know when using foliar fertilizer. Let's learn about relevant knowledge together with Xiaobian.

1. Selection of foliar fertilizer

1, seedling stage

Under the condition of applying enough basal fertilizer, strong seedlings can choose not to spray foliar fertilizer, seedlings can be sprayed with some plant growth regulators-DPC as appropriate to inhibit their growth, while weak seedlings can be sprayed with nitrogen, phosphorus and potassium for many times to promote weak and strong.

2. Growth period

When cotton enters the period of simultaneous vegetative growth and reproductive growth, plant growth regulators can be sprayed appropriately under the condition of applying sufficient base fertilizer, and trace fertilizer can be sprayed at the same time. For example, boron deficiency will cause bud and boll drop, so boron fertilizer can be sprayed 2-3 times in bud stage. When spraying plant growth regulators in the seedling growth period, it can also provide control fertilizer and water for regulation; weak seedlings in the growth period under the condition of normal fertilizer and water management, can spray appropriate nitrogen, phosphorus and potassium elements.

3, later

When drought and premature senescence occur in cotton field in late stage, some nutritional foliar fertilizer can be sprayed to prevent premature senescence.

II. Precautions for the use of foliar fertilizer

1. Application period and time

Foliar fertilizer application was mainly carried out from vegetative growth stage to vegetative growth and reproductive growth stage. Among them, the effect of using foliar fertilizer in the middle and late stages of growth is greater than that in the late stage, so the best use period of foliar fertilizer should be carried out in the middle stage of cotton growth, that is, from the end of June to the beginning of August, when the effect is better. Spraying foliar fertilizer is best to choose cloudy or sunny morning dew or after 4 pm, try to avoid high temperature and strong light at noon, so as not to evaporate too fast or cause leaf burns. If it rains 3 hours after spraying fertilizer, it should be sprayed again when it is sunny after the rain, but the concentration should be appropriately reduced.

2. Application method and concentration

Foliar fertilizer should be sprayed mainly on young leaves, and the back of leaves is the best. It is appropriate to spray the front and back of branches and leaves and start dripping water. The spraying should be uniform. The spraying should be used with the mixture and should not be placed for too long. Different crop types and their foliar fertilizer dosage and spraying concentration are also different, generally spraying fertilizer amount per mu is 45-55 kg, concentration varies from 0.5% to 1%, or strictly in accordance with the instructions for use. Can also be added to some attached agents, such as washing powder, soap solution, etc., to enhance the adhesion of fertilizer solution on the leaves, extend the absorption time of the leaves.

The above is the introduction of cotton foliar fertilizer selection and use precautions, I hope to help you, want to know more about the relevant knowledge, please pay attention to us.