After the corn is plucked, it begins to enter the reproductive growth stage, and the leaf area coefficient reaches the maximum during this period. The silking period is the most critical period for determining the number of grains. After entering the grain period, it is an important period for determining grain weight and an important growth period for grain yield. This period plays a decisive role in corn yield and is also a period of frequent pests and diseases. In order to achieve high yields, it is necessary to strengthen the field management during this period.
Refusing drought
At the ear of corn, the water consumption is the largest, accounting for 30% to 35% of the total water consumption in the whole life. The water consumption intensity during the tasseling period is the largest, which is the critical period of corn water demand. The drought and water shortage will cause different degrees of production reduction, or even the harvest, serious. Affect the output. When the relative water content of the soil is less than 70%, it is necessary to water it in time to avoid the drought and reduce production.
Supplemental application of granular fertilizer
The earing stage is the period in which the corn needs the most fertilizer and the maximum fertilizer strength in the whole life, and it is necessary to topdress the fertilizer according to the situation. For the de-fertilized corn, the granular fertilizer is generally applied during the tasseling to the silking stage. The nitrogen fertilizer is mainly used, and about 10 kg of urea per acre can promote grain filling and increase the seed setting rate and grain weight.
Remove empty stalks
The empty stalk plants affect the ventilation and light transmission of the field, and compete with the normal plants for water and fertilizer, air consumption of nutrients, and possibly spread diseases, which seriously affect the yield and should be removed early. In addition to the upper ear, the second and third ear development of the corn plant is slow. In addition to the special variety, such spikelets are generally not strong, and such "clams" should also be removed to reduce nutrient inefficient consumption. The main ear is full, the rods are large and the grains are full, and the yield is increased. When removing empty stalks and "crowbars", we must also take care of removing diseased plants and reducing the spread of pests and diseases.
Cultivating soil
Inter-cultivation can improve soil permeability and fertilizer supply, promote root development, and remove weeds. Soil cultivation can increase the formation of corn roots and enhance the lodging resistance of maize. Due to the windy autumn, it is easy to cause corn to fall. Therefore, it is necessary to cultivate the soil in time after the corn is topdressed to prevent the occurrence of lodging.
Pest control
Common pests and diseases in the late stage of maize include stem rot, leaf spot, smut, corn borer, armyworm, aphids, etc., and should be actively controlled. For the armyworm, it can be sprayed with a salt of M. sulphate, Bacillus thuringiensis or KK. When it is serious, it is separated by 7 to 10 fields and sprayed 2 to 3 times. For corn leaf spot, spray with 5% chlorothalonil or 75% mancozeb, 70% thiophanate or the like. Spraying can be combined with spraying potassium dihydrogen phosphate to prevent premature aging.
Late harvest
The promotion of suitable late harvest technology can ensure that corn has sufficient grouting time, which is an effective measure to increase grain weight and increase production and income. The standard for maturity of maize is that the leaves are white, dry and loose, the milk line disappears, and the grain is shiny. At this time, the grain weight is the highest. This technique does not require any additional cost input. The test proves that the average yield of 1000-grain weight is increased for every one day postponed. 3 grams or so.
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