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:
One is the irrigation during the ear period. Corn enters the jointing and booting stage, that is, the big bell-mouth period is sensitive to moisture and prevents “card neck drynessâ€. 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 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, prevention and control of 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.
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