The whole growth and development process of corn is divided into seedling stage, jointing and booting stage, and flowering stage. Among them, the management of jointing and booting stage has a great influence on the yield of corn. The central task of the jointing and booting stage is to coordinate vegetative growth and reproductive growth, appropriately control the length and length of stems and leaves, and promote the growth of leaves, spikes, and grains to effectively increase maize yield. Its technical measures are:


First, irrigation at the ear stage

Corn enters the jointing and booting stage, that is, the big bell-mouth period is sensitive to moisture and prevents “card neck dryness”. In the middle and late stages of corn growth, the water demand of the plants is large, the lack of water results in poor fertilization, premature leaf senescence, decreased photosynthesis and nutrient transport capacity, and increased number of aborted grains and decreased grain weight. When the relative water content of the soil is less than 70%, it is necessary to water in a timely manner so as to avoid a decrease in production due to drought. In case of stormwater accumulation, drainage should be timely, especially during grouting, and more attention should be paid to flood prevention and drainage.

The second is the prevention and control

When corn leaves grow to 9-12 leaves, they are sprayed with corn dwarfs to prevent and control corn growth and control corn height.

The third is to chase panicle fertilizer

During the period of jointing to the end of booting stage, panicle fertilizer is applied. The fertilization period is generally in the 10-12 leaf stage (ie, the big bell-mouth period), which can ensure plant growth, promote the development of the ear, promote floret differentiation, and increase grain number. Should be based on nitrogen fertilizer, urea 25-30 kg urea.

Fourth, prevent and treat pests and diseases

The use of chlorothalonil and agricultural streptomycin sprays to prevent top rot and bacterial stalk rot. Control of large and small spot can be used special WP wet wipe, chlorothalonil WP to water spray, spray once every 7 days, continuous spray 2 to 3 times. Prevention of corn borer can be thrown into the heart of corn in the corn big flare season with toxic phosporum, chlorpyrifos or Bt granules mixed with fine soil.

How to prevent corn "prosperous"?

The optimum application period of corn control agent is corn 6-10 leaf stage, ie, corn "foot height" to corn "knee height", this period is the early jointing stage of corn, and the corn stem can be thickened after application. Between the shortening and the height reduction of the ear, the number of layers and strips of the “Kingwang root” increase, which can effectively prevent the lodging of corn and promote the movement of nutrients to the panicle, reducing the number of empty trees and baldness.

The control agent was used in the corn less than 6 leaf stage. Because the control was too early, the corn stems were not vigorous and the stems were too low. The application of corn control agent was too late, and the number of leaves exceeded 12 pieces. Maize has passed the jointing stage and will cause the following problems:

1. Incorrect shrinkage of corn

Originally, the basal part of 1-3 should be shortened, but now it has caused the middle 4-5 knots to be shortened from the base to the 1-3 knots. This not only can not effectively prevent corn lodging, but also lead to poor corn growth, resulting in lower corn production.

2. Affecting Maize Tassel Differentiation

After the jointing, the tassels of corn begin to differentiate. If corn growth is controlled at this time, it will affect the differentiation of maize tassels, resulting in less corn pollen, thereby affecting maize pollination and finally affecting corn yield.

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