Maize begins to enter the reproductive growth stage after tasseling, during which the leaf area coefficient reaches its maximum. The spinning period is the most critical period to determine the number of grains. After entering the grain period, it is an important period to determine the grain weight and an important growth period to form grain yield. This period plays a decisive role in corn yield and is also a period of frequent pests. In order to strive for high yields, field management during this period must be strengthened.

Refuse drought

The earliest water consumption in the ear of corn is 30% to 35% of the total water consumption in the whole life. The water consumption intensity in the tasseling period is the highest. It is the critical period of water demand for corn. Affect the yield. When the relative water content of the soil is less than 70%, watering should be carried out in time to avoid drought-induced yield reduction.

Supplementary application of grain fertilizer

The ear stage is the period when corn needs the most amount of fertilizers and the intensity of fertilizers is the highest in the whole life. For de-fertilized corn, the grain fertilizer is generally applied from the tasseling to spinning stage, mainly nitrogen fertilizer, and about 10 kg of urea per acre can promote the grain filling, increase the seed setting rate and grain weight.

Remove empty stalks

Empty stalk plants affect the ventilation and light transmission of the field, and compete with normal plants for water and fertilizer, empty nutrients, and may spread disease, which seriously affects corn yield and should be removed early. Except for the upper ears of corn plants, the second and third ears are stunted. Except for special varieties, such spikelets are generally not strong. Such "blind sticks" should also be removed to reduce the ineffective consumption of nutrients and promote The main ear is full, the bar is large and the grain is full, increasing the yield. When removing empty stalks and "blind sticks", we must also take care to remove diseased plants to reduce the spread of pests and diseases.

Cultivating soil

Cultivation can improve soil permeability and fertilizer and water supply, promote root development, and remove weeds. Soil cultivation can increase the formation of corn aerial roots and enhance corn lodging resistance. Because of the windy autumn, it is easy to cause corn lodging. Therefore, it is necessary to cultivate soil in time after corn top dressing to prevent lodging.

Pest control

Common diseases and insect pests in the later stage of corn include stem rot, leaf spot disease, smut, corn borer, armyworm, aphids, etc., and should be actively controlled. For mythimna separata, it can be sprayed with avermectin, Bacillus thuringiensis, etc. In severe cases, the interval is 7 to 10 days, and the spray is continuous 2 to 3 times. For corn leaf spot, spray with 5% chlorothalonil or 75% mancozeb, 70% thiophanate-methyl. It can be combined with spraying potassium dihydrogen phosphate to prevent premature aging.

Late harvest

Promoting proper late harvest technology can ensure that corn has sufficient filling time, which is an effective measure to increase grain weight, increase production and income. The standard of corn maturity is that the bract leaves turn white, dry and loose, the milk line disappears, the grain is shiny, and the grain weight is the highest at this time. This technology does not need to increase any cost input. Tests have shown that the average weight per thousand kernels increases by about 3 grams for every 1 day of delayed harvest.

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