When is the best time for harvesting and replanting in agricultural wheat planting?

In wheat planting, it is necessary to harvest in time at the end of wax ripening, and the dry grain weight and yield of wheat harvested at this stage are the highest.

Early or late harvest will reduce the dry grain weight and yield of wheat. There is an agricultural proverb among the people: "When the wheat harvest rings, Longkou grabs the grain" and "Harvest the wheat like putting out a fire", all of which are derived from thousands of years' planting experience. Of course, they will not be groundless. The essence of this can be imagined. According to the determination of researchers, the 1000-grain weight of wheat harvested at the end of wax ripening is the largest. After that, the dry grain weight decreased by 0.3~0.4 g per day, and by 1~ 1.2 g per day on the 4th ~ 5th day. If the yield per mu is calculated according to the standard of 350,000-400,000 ears and 27 grains per ear, the yield per mu will be reduced by1g. According to this law, the national wheat yield will be greatly reduced because of the inappropriate harvest time.

There are two reasons for the high yield of wheat at the end of wax ripening: first, wheat is in the slow filling stage before the end of wax ripening, and if it is harvested at this time, the grain filling is insufficient, which artificially leads to the decline of dry grain weight of wheat; If wheat is harvested after wax ripening, the dry grain weight will be reduced because the wheat grain has stopped filling and the plant is still breathing, resulting in energy consumption and nutrient reflux.

"Wheat self-injury sickle (early harvest) is better than soybean", which shows that the quality of early harvest is good. At the same time, wheat will encounter rainy weather in the late growth stage, which will not only leach out the grain contents, but also cause germination before harvest. Secondly, at the end of wax ripening, the lower ear nodes of wheat are golden yellow and slightly green, so it is not easy to break the ear when harvesting. If the harvest is delayed, the grain will shrink, which will easily lead to ear loss and grain loss.

After wheat is harvested, it is necessary to replant as soon as possible, such as vegetables, silage corn, forage grass, etc., so that crops can be harvested continuously, and the land can be kept active, loose and soft, and the fertility will not be lost. At the same time, after the previous crop is harvested, part of the straw is returned to the field, which increases the humus content and improves the soil fertility.