High-yield summer corn requires five defenses

During the growth period of air-defended stalk corn, due to lack of supply of mineral nutrients and malnutrition, the demand for spike differentiation on nutrients could not be met; planting density was too high, ventilation and light transmission were poor, and light and effects were weakened; partial nitrogen fertilizer was applied, and phosphorus and potassium fertilizers were lacking. And other factors will cause empty stalks.

Control methods: Appropriate amount of topdressing and irrigation in jointing stage and big bell-mouth stage of maize should be suitable for panicle differentiation and normal development; nitrogen fertilizer should not be applied to topdressing, and nitrogen, phosphorus and potassium should be used in combination to ensure nutrient balance and reduce empty stalks. rate.

Causes of baldness caused by baldness are mainly due to lack of phosphorus in the soil. During the flowering phase of booting, the sugar metabolism, protein synthesis, and cell division of the corn are blocked. The top of the ear is atrophic, the filament elongation is slow, pollination is inhibited, and the potassium deficiency in the soil is soluble. The transport of carbohydrates to the grain is hindered, and starch in the grain is insufficient; pests or droughts affect the transportation of nutrients, resulting in bald or empty ears.

Control methods: First, to prevent premature plant failure, apply more phosphorus and potassium fertilizers, spraying 0.4% potassium dihydrogen phosphate solution every 7-10 days during the jointing stage of corn, spraying 3 times, to supplement phosphorus and potassium; Irrigation, especially in the drought period, we must add water in time; Third, we must prevent and control pests and diseases.

Three causes of premature aging caused by premature aging: First, the late rain, soil hardening, lack of oxygen, root activity was blocked, weakened absorption function, leaves yellow or curly; Second, lack of fertilizer, plant dwarf, slow growth.

Control methods: In the jointing period of maize and big bell-mouth, heavy fertilizer, combined with foliar spray fertilizer, nutritional supplements, extend the functional period of the leaves; balance the water supply, timely watering in case of drought, and timely drainage in case of heavy rain or rain. Ensure the normal growth and development of corn.

For the four defenses, we must do a good job of seedlings to promote seedlings to be robust and strong; second, we must cultivate the soil cultivating roots to increase the number of supporting roots and improve lodging resistance; and thirdly, apply potassium dihydrogen phosphate to the leaves based on the application of potash fertilizer to the basal fertilizers. Increase plant toughness.

Lodging during corn growth should take active remedial measures. If lodging occurs after the jointing, the cultivator should be cultivating the soil and it is not necessary to raise it by hand to allow the corn itself to recover. Loosing after tasseling should be carried out manually and the soil should be cultivated in order to reduce losses.

The five pest-resistant corns are prone to large and small spot disease at the later stage, and can be controlled by 50% carbendazim or 75% chlorothalonil at the early stage of disease. When the corn borer occurs in the later period, it must be promptly controlled.

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