About the time of winter wheat turning green, booting, filling and ripening.

The turning green stage, booting stage, filling stage and maturity stage of wheat are related to the weather in different regions and years, and the approximate time is as follows:

1, winter wheat turned green in the middle and late February

2. Booting stage of winter wheat in mid-April.

3. Winter wheat filling period (early May)

The harvest time of winter wheat is from the end of May to the beginning of June.

The key points of spring management are: promoting the weak and strengthening the strong, applying jointing fertilizer well, clearing ditches and regulating soil moisture, preventing waterlogging, preventing "spring cold" and preventing diseases, weeds and insects in time.

(A) the application of strong tiller fertilizer, promote from weak to strong. For fields with insufficient basal seedling fertilizer and small population (tillers per mu less than 300,000), especially for weak seedlings sown late, 65,438+00-65,438+05 kg ternary high-efficiency compound fertilizer (N, P2O5 and K2O are 65,438+05% respectively) should be applied in early spring, and for those with large amount of straw returned to the fields and weak seedlings.

(2) Apply jointing fertilizer to strengthen stalks and ears. For the first-class and second-class seedling wheat fields with suitable tillering number, when the leaf color fades normally and the first internode of the plant is close to the fixed length, topdressing jointing fertilizer. Generally, 5 kg of urea is applied per mu, and ternary high-efficiency compound fertilizer 10- 15 kg. For wheat fields with large population and abnormal leaf color fading, the application of jointing fertilizer should be postponed appropriately to prevent lodging. For the three seedlings with too small population and insufficient tillering, as well as the wheat field with serious yellowing of fertilization, it is necessary to apply pulling and saving fertilizer as soon as possible.

(3) Clear ditches to conserve moisture, prevent waterlogging and drought. In early spring, in the wheat field without drainage ditch, three ditches should be opened in the wheat field as soon as possible on sunny days, and the ditched soil should be evenly dispersed so as not to damage the wheat seedlings. Dredging should be done in time for the wheat field that has been ditched to ensure smooth drainage, so that the rain stops and the field is dry, and there is no water in the ditch. At the same time, three ditches outside the wheat field should be dredged.

(4) Prevention and early remedy of freezing injury. 2-3 days after the occurrence of freezing injury of wheat, investigate the degree of freezing injury of young ears, and topdressing the wheat fields with the death rate of freezing injury of stems and tillers exceeding 10% in time. Generally, 4-5 kg of urea should be topdressing in wheat fields with freezing mortality 10%-30%; In wheat fields over 30%, for every increase of 10 percentage point of tiller freezing injury mortality, 2-3kg urea should be applied per mu, with the maximum not exceeding15kg.

(5) Pest control and chemical weeding. Focus on strengthening the prediction and prevention of scab, aphid, powdery mildew, sheath blight, rust and other diseases and insect pests, especially at heading and early flowering stage. All localities should carry out chemical weeding in time according to the types of weeds to control the harm of weeds. For wheat fields with large population and high lodging risk, it is necessary to suppress or control the flourishing in time.