There is an optimal period for wheat harvesting - waxing at the end of the maturing period, at which time the harvested wheat has the highest grain weight and yield. Harvesting too early or too late results in a reduction in grain weight and yield. In recent years, researchers have studied the grouting speeds of several varieties such as Wenmai 6, Yumai 18, and Xin 3306, and the maximum grain weight at the end of wheat wax ripening. After 3 days of harvesting, the average daily weight per 1,000 kernels was reduced by 0.3-0.4 grams, and by the 4th-5th day of harvesting, the average daily weight per 1 000-grain weight was reduced by 1 to 1.2 grams. If the per acre by 350,000 to 400,000 ear, 35 per panicle calculation, 1000 grams per weight reduction of 1 g, a yield of 13 to 15 kg per acre. There are two reasons why wheat has a high harvest rate at the end of wax production: First, the wheat is in a slow grain filling stage before the final waxing stage. If harvested at this time, the grain filling is not sufficient and the grain weight of the wheat is artificially reduced; if after waxing Harvesting, because the grain has stopped filling, and the plants are still breathing, the consumption of energy leads to nutrient reflux, grain weight decreased. At the same time, wheat often encounters rainy weather during the late growth period, which not only causes the contents of the grains to be leached out, but also reduces the grain weight of the grains. It often causes the wheat to sprout, or causes mildew, which seriously reduces the yield and quality of wheat. Second, in the late waxing stage of wheat, the next section of the panicle is golden yellow and greenish, and it is not easy for the harvest to drop.