The maturation of corn needs to go through the milk ripening period, wax ripening period, complete ripening period of three stages: 1, look at the location of the milk line: corn kernel grouting filling order is: the middle of the cob is faster than the lower part, and faster than the upper part. From a kernel to see: from the kernel part to the base of the filling. In the process of grouting and filling, from the back of the seed embryo can be seen from the top of the kernel to the base of the deep line, which has a clear boundary, known as the milk line.
2, the number of green leaves: According to the study that: when the cob bracts yellow, the upper part of the plant is still 7-8 green leaves when harvesting, thousand grain weight of 318 grams, equivalent to 92.9% of the grain weight at maturity; when the cob bracts yellow, there are still 5 or so green leaves of the plant when harvesting, thousand grain weight of 333 grams, for the maturity of the grain weight of 98.8%; when the cob bracts yellow and loosened, the plant is only 1-2 green leaves when harvesting, the grain weight of 1-33 g; when the cob bracts yellow and loose, the plant is only 1-2 green leaves when harvesting, the grain weight of 1-33 g. When the bracts are yellow and loose, and the plant has only 1- 2 green leaves, the thousand grain weight is the highest, 345 grams.
3, grouting time: from the corn staged harvest results: 50 days after pollination, the maximum thousand grain weight of 344 grams; 45 days after pollination, the thousand grain weight of 3369 grams, equivalent to 98.8% of the maturity; 40 days after pollination, the thousand grain weight of 313 grams, equivalent to 90.9% of the maturity; after 50 days of pollination, due to respiratory depletion, the grain weight began to decline in the pollinated After 55 days, the weight of 1,000 grains was 336 grams, down 1.8%.