The “cold dew†has just passed, which is the key period and peak period of winter wheat planting. Recently, the Huanghuaihai and parts of the northwest are affected by the delay of harvesting of the previous crops and the continuous rainfall. The Tengqi is late, the soil is wet, the land preparation is difficult to carry out normally, the wheat planting is postponed, and the suitable sowing date may be missed. Broadcast wheat should be prepared. The wheat expert guidance group of the Ministry of Agriculture believes that in the Huanghuaihai and Northwest wheat areas, the winter wheat that has been planted more than the suitable sowing date and the standard of strong seedlings before wintering is generally called late-season wheat. Late sowing wheat from the sowing to the winter before the accumulated temperature is lower than 420 ° C, less than 4 leaves per plant, less than one per plant. It is recommended that the late broadcast wheat adopt the “four supplements and one promotion†technical measures for disaster prevention and production increase.
The first is to use good varieties to make up for the night. When the sowing date exceeds the appropriate period, the high-yield varieties with appropriate early maturity should be selected, and the varieties of semi-winter and semi-winter springs can be selected in the Huang-Huai-Hai area.
The second is to improve the quality, so as to make up for the night. Work hard to improve the quality of the land preparation and sowing, and lay the foundation for planting. As early as possible, rush to broadcast early. Fine soil preparation, under the foot, ensure that the relative water content of the plough layer is 70%-80%. Appropriate shallow sowing, sowing depth 3-4 cm, to prevent too deep sowing, resulting in late emergence of seedlings, seedlings and seedlings weak. When sowing late, it can be properly soaked and germinated. Before sowing, soak it in warm water of 20-30 °C for 5 hours, then remove it for drying and sowing, or prematurely emerge for 2-3 days.
The third is to increase the amount of broadcast to cover the night. Relying on the main stem into the ear is the key to increasing the yield of late buckwheat. Increasing the amount of sowing should ensure that the appropriate number of panicles per acre is achieved, and that the population is too large to cause large populations and the stems are weak, resulting in lodging and yield reduction. Missing the appropriate sowing date, generally increase the basic seedlings per day by 10,000 or so, but the maximum should not exceed 350,000.
The fourth is to increase the application of fertilizer to make up for the night. Appropriate increase of fertilizer application, balanced fertilization of nitrogen, phosphorus and potassium, with special emphasis on the application of phosphate fertilizer, can promote the development of wheat roots, promote the growth of tillers and increase the rate of tillering.
The fifth is scientific management, which promotes the growth of seedlings into more ears. In the early spring, it returns to the buckwheat period, raises the ground temperature, and promotes the early growth of wheat. Grasping the management of fertilizer and water in the body, and weakening and strengthening.
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