The time to grasp the golden period of corn harvest
First, look at the growth characteristics of corn and determine the best harvest period for corn. The maturity of maize needs to go through three stages: milk ripening, wax ripening and ripening. Because corn is different from other crops, the grain is born on the ear, and it is not easy to fall off after maturity, and the post-ripening effect can be completed on the plant. Therefore, the ripening period is the best harvest period for corn. If the milk is ripe, it will be harvested too early. At this time, a large amount of nutrients in the plant will be transported to the grain, and there will be 45%-70% of the water in the grain. At this time, the harvested corn will cost a lot of time, after drying. Thousands of grains are greatly reduced. According to the test, the milk yield can generally reduce production by 20%-30%, and the quality is significantly reduced. If the harvest is not completed after the ripening period, the support of the corn stalk is reduced, the plant is easy to fold, and the lodging causes the mold to contact with the ground to cause mildew, and is also vulnerable to bird and insect damage, causing undue loss of yield and quality. Whether the corn enters the ripening period, in the normal maturity of the plant, it can be seen from the appearance characteristics: the middle and lower leaves of the plant turn yellow, the base leaves are dry, the yellow leaves of the ear are yellowish white and loose, the grain milk line disappears, the black layer Appears, hardens, and presents the inherent color of the variety.
The milk line is the dividing line between the corn kernel (the so-called corn umbilical, which can be used for oil extraction - corn germ oil) and the endosperm (the main part of edible corn, rich in starch), and the black layer (or black layer). ) is the dividing line between corn kernels and cobs. When the black layer of corn grains begins to appear and gradually deepens, it indicates that the corn tends to mature.
Second, calculate the time, determine the corn harvest period, under normal circumstances, it is appropriate to extend the corn growth period by about 10 days. For example, Zhengdan 958 has a growth period of 96 days. It can be harvested from the date of normal sowing, and the soil can be normally emerged, and the growth period is extended by about 10 days and harvested in about 106 days. If the planting time is on June 1, it can be harvested around September 17.
Because the moisture content of corn harvested in the evening is generally around 30%-40%, the weather forecast can be heard, and the air is dried in sunny weather. When the water content is 20%-30%, the threshing and drying are carried out in time, and the moisture content of the corn is 14 % below is appropriate.
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