Appropriate late summer corn yield

The late harvest technology of summer corn is to appropriately postpone the harvesting period of corn, make full use of the light and heat resources of corn, and play a productive, water-saving, high-yield, and efficient cultivation technology.

First, the shortcomings of early harvest The current prominent problem in the production of summer maize in southern Anhui is the early harvest of summer corn. The corn in the production is not fully mature, and the peasants are eager to harvest, usually 5-7 days in advance, and some harvest more than 10 days in advance. The current large-scale cultivation of summer corn includes Zhengdan 958, Yandan 20, Qinyu 16, Daiyu 35 and Xianyu 335, etc. The actual growth period is 105-110 days, and grain filling needs 50-52 days if sowing time. On June 10, the harvest period should be from September 25 to October 1. Farmers harvest time is actually September 15 and September 20 peak, grain filling is less than 45 days, corn is in the wax phase. However, it has not yet been fully matured and is harvested. Not only the previous investment in fertilizer and water is wasted, the production potential of the variety is not fully tapped, and the corn starch accumulation time is short and the grouting is not full, which affects the output, and generally results in a reduction of production by about 10%. The decline.

II. Advantages of regular late harvest At present, when maize is harvested in southern Yunnan, corn is in the wax ripening stage. In terms of the current level of summer corn production in southern Fujian, the grain weight per 1-day increase from the wax ripening period increases by 3- 4 grams, mu increase production 6-8 kg, if you receive 7-10 days late, mu yield up to 55 kg or more. The harvest period in my county should be moved to September 25-30.

Third, the maturity of summer corn mature standard corn matured, wax cooked, cooked three periods, the maturity of the highest yield of grain, ripening period has three criteria: First, the corn sorghum leaves turn white, temporal leaf loose; It is the disappearance of the milk line. Peel the corn ear and break it from the middle. You can see that there is a yellow-white boundary line in the middle of the grain. This is the milk line. If you can see the milk line, the corn is in the wax ripening period. After this line of milk, the corn is fully mature; third, the black layer of the grain appears. After removing the corn grain, the pedicel at the bottom of the grain is removed. If a layer of black is seen, it indicates that the corn has matured and the layer is black. Called the black layer.

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