Wheat grains began to harden at the early stage of wax ripening, and the grains gradually hardened from milky white state. If you take out the grain and scratch it with your fingers, it will look sallow. When wheat is in the middle stage of wax ripening, the whole plant turns yellow, but the stem of wheat is still elastic. This is the best time for artificial harvesting. At the end of wax ripening of wheat, the dry matter accumulation of wheat grain reached the peak, with excellent quality, the highest yield and physiological integrity. Generally speaking, it is the best time to harvest mechanically 2-3 days earlier than the mature stage (the wheat grains are completely hardened).
When the wheat grows to the full maturity stage, the wheat straw is completely dry, the grain volume is reduced, the water content is reduced, and the wheat is dry and hard. At this time, wheat is not easy to be crushed by squeezing, threshing and mechanical harvesting. However, when wheat is fully mature, stems, leaves and roots can no longer produce and accumulate nutrients, but they still need to consume nutrients to breathe. Nutrients in wheat grains will flow back to the stems, resulting in a decrease of 30 kg to 50 kg in grain weight and yield per mu.
In addition, if it continues to rain at this time, the wheat will easily germinate and become moldy, and the quality will become worse and the loss will be greater. Therefore, it is very important to seize the opportunity of harvest and catch the harvest at the right time. Don't wait until the wheat flour is ripe and the grain falls before harvesting. At that time, it is not a loss of 100 Jin to reduce production.