Milk maturity period: from the early stage of milk maturation to the early stage of wax maturity. Generally, it takes about 20 days for middle-maturing varieties, that is, from 16 days after pollination to 35-36 days; middle- and late-maturing varieties need about 22 days, from 18-19 days after pollination to around 40 days; late-maturing varieties need about 24 days , From 24 days after pollination to around 45 days. During this period, various nutrients accumulate rapidly. The total dry matter of the grains accounts for 70% to 80% of the maximum dry matter weight, the volume is close to the maximum value, and the moisture content of the grains is about 70%～ 80%. Because the grains are milky white paste for a long time, it is called milk maturity. If it is cut with a nail, milky white slurry will overflow.
Wax ripening period: from the initial stage of wax ripening to before the wax ripening. Generally, it takes about 15 days for middle-maturing varieties, that is, from 36 to 37 days after pollination to 51-52 days; middle- and late-maturing varieties need 16 to 17 days, that is, from 40 days after pollination to 56-57 days; late-maturing varieties It takes 18-19 days, starting from 45 days after pollination to 63-64 days. During this period, the amount of dry matter accumulation is small, the total amount and volume of dry matter have reached or approached the maximum value, and the grain moisture content has dropped to 50% to 60%. The content of the grain changes from pasty to waxy, so it is called wax maturity. Only one scratch can be left when scratching with a nail.
Mature period: Dry matter accumulation has stopped after wax is ripe, mainly due to the dehydration process, and the grain moisture drops to 30%-40%. The base of the embryo reaches physiological maturity, and the sharp crown is removed, and the black layer appears, which is the mature stage.
Harvest time: Because corn is different from other crops, the grains are grown on the ears, and they are not easy to fall off after maturity. They can complete the maturation effect on the plants. Therefore, the maturity period is the best harvest period for corn; if the stalk silage is carried out, it can be harvested early to the end of wax maturity or early maturity. Correctly grasping the harvest period of corn is an important measure to ensure high quality and high yield of corn. If the corn stalk is not harvested after the maturity period, the supporting force of the corn stalk will be reduced, the plant will easily fall, and the lodging will cause the ear to contact the ground and cause mildew, and it is also vulnerable to bird and insect damage, causing undue losses in yield and quality. Whether the corn has entered the fully mature period can be seen from its appearance characteristics. The middle and lower leaves of the plant turn yellow, the base leaves are dry, the ear bracts become yellowish white and loose, and the grains become hard and show the inherent color of this variety.
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