When is the jointing stage of wheat? How to spray pesticides?

At present, the better techniques for increasing wheat yield are: first, sowing with wide precision, increasing the sowing width to about 8 cm, so that the wheat will not be too crowded, avoiding excessive growth and weak seedlings, and expanding the row spacing to about 26 cm, which can ensure good ventilation and light transmission. Wheat should be sown on June 20-27 of 15, and jointing fertilizer is expected to be applied to barley fields around March of15; It is estimated that jointing fertilizer will be applied to wheat fields from March 20th to March 25th. Early application, such as small population, large main stem and insufficient tillering, early yellowing, early shedding and so on. Otherwise, the application is late.

Although there are many varieties of wheat, no matter which one, they prefer to live in wet soil. Therefore, it is necessary to pay attention to the appearance. The temperature rises gradually in spring, so it is necessary to replenish enough water during this period. The jointing stage of wheat is the key period to improve the number of grains per spike and protect flowers and seeds. Wheat plants grow rapidly at jointing stage and need more fertilizer and water. If the water is insufficient, it will not only reduce the number of ears per mu, but also have a great impact on the number of grains per ear. Irrigation at jointing stage is 50-60m3/mu.

With the temperature rising after wheat jointing stage, wheat aphid, red spider, powdery mildew, sheath blight and embroidery disease will also enter a high incidence period. It is necessary to pay close attention to the occurrence of pests and diseases in the field and take preventive measures in time. Wheat grows vigorously at jointing stage, and the demand for water is very great. Water the wheat according to the actual situation. Excessive humidity in wheat fields can cause sheath blight, root rot, aphids, red spiders and other pests and diseases.

Wheat jointing usually begins when the annual temperature rises above 10℃. Due to regional climate differences, the jointing time will be different, but generally speaking, the first step of wheat jointing is the combination of fertilizer and water. Wheat needs enough nutrients at jointing stage, but top-heavy will aggravate wheat lodging. Wheat fields with dark green leaves, too much nitrogen fertilizer or too high density should be sprayed in advance until the wheat turns green or rises.