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Suitable period for wheat harvest
Wheat maturity is the main basis for determining the harvest period. The maturity period is divided into milk maturity, wax maturity and maturity. The milk ripening and wax maturity stages are divided into three stages: initial, middle and final stages, which are determined according to the color and water content of the plants and grains. The stems and leaves of the milky stage gradually turn yellowish green from green, and the grains have milky inclusions. At the end of milk ripening, the volume and fresh weight of the kernel reached the maximum, the color turned yellowish and the ventral groove was green; the content of the wax during the maturity stage was waxy, and the hardness changed from soft to hard as the ripening process progressed. In the early stage of waxy ripening, the leaves are yellow and not dry, the grain is light yellow, the ventral groove is chlorotic, and there is no pulp in the grain. In the middle stage of waxy ripening, the leaves are dry yellow, the stems are elastic, and the grains turn yellow, full and moist. At the end of the waxing stage, the whole plant turns yellow, the stem is still elastic, and the grain yellow is slightly hard. During the ripening period, the leaves are yellow and the grains are hardened, showing the true color of the variety.
The most suitable harvesting stage is from the end of the wax to the ripening period. Premature harvest, grain is not full, yield is low, and quality is poor. After harvesting too late, the grain is reduced by the action of respiration and rain leaching, the carbohydrate content is reduced, the 1000-grain weight, the bulk density, the flour yield is reduced, the grain is easy to fall in the field, the rain is easy to sprout on the ear, and some varieties are easy to fold the stalk. Drop the ear. The artificial harvesting should be carried out in the middle to the end of the waxing; when harvesting directly using the combine harvester, it should be carried out from the waxy end to the ripening stage. The wheat field for planting is harvested during the ripening period.
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