After early application of seedling fertilizer and late-sown wheat emergence, due to low temperature, we should pay close attention to the quick-acting effect of seedling fertilizer. The late main wheat has only 3~4 main stems before winter. The average vegetative growth is less than 4 leaves before the year. Most of the wheat seedlings can not be divided before winter. The application should be carried out early and the seedlings should be applied early to promote the early growth of the wheat seedlings. In the low temperature stage in winter, the release of ammonium carbonate is fast, and the fertilizer is applied quickly. See 7.5~10 kg per mu, or 4~5 kg per mu. Cold soaking fields and waterlogged fields combined with topdressing nitrogen fertilizer can supplement 10~15 kg of superphosphate per acre to improve cold resistance and promote wheat seedling growth.
After the application of wax fertilizer, the late-season wheat is weak in cold resistance and vulnerable to low-temperature freezing damage. The applied fertilizer can use the heat released by the organic fertilizer mainly to prevent cold and warm, and the condition can be applied to the fertilizer or soil fertilizer 1500 per mu. ~2000 kg, spread to the wheat seedling line, or 8-10 kg of urea per acre, in addition to the supply of wheat seedlings in a small amount of slow growth in winter, can also play the role of winter application spring, promote wheat long roots, early return to green, Consolidate the forks before the winter and promote the splitting of the spring. Adequate application of base fertilizer can appropriately reduce the amount of wax fertilizer, prevent the increase of inefficient tillering in the later period, the population is too large, and the internodes are elongated and cause late lodging, which is unfavorable for high yield and stable yield.
The effective tillering period of the late-sown wheat with good tillering is 15~30 days longer than that of the suitable sowing. The appropriate amount of returning green fertilizer is conducive to fighting for early spring tillering. Therefore, for the late-sown wheat field with insufficient tillering, the green fertilizer can be applied at the end of February to the beginning of March to see the wheat application. Each acre can be applied with 3~5 kg of urea or 10~15 kg of ammonium bicarbonate, or 500~750 kg of manure and urine. For wheat fields with severe de-fertilization and severely damaged wheat seedlings, 15 kg of ammonium bicarbonate per acre or 100-150 ml of active liquid fertilizer with Huimanfeng can be applied to spray 40-50 kg of water. The phosphorus-deficient wheat field is supplemented with 10-15 kg of superphosphate per acre. In the wheat field where the soil is fertile or the bottom is fat, in the case of high temperature and sensation, there is a late-seeding early detection of the image, and the application of top dressing should be controlled after the spring to prevent lodging in the later stage.
Re-application of jointing and booting fat wheat, jointing and booting fertilizer refers to the fertilizer applied from the jointing to the tip of the flag leaf. At the time of jointing, if the base fertilizer and the fertilized fertilizer are applied in a small and late-sown wheat field, attention should be paid to heavy fertilization, especially for the lack of development of the population at the jointing stage, the early fall of the yellowing, the narrow and thin leaves, and the straightening of the leaves. It is necessary to apply fertilizer in time and in combination with fertilizer and water, and apply 6~8 kg of urea per mu. For the group when the jointing is too large, the leaves are dark green, the leaves are drooping, and the small stalks are delayed and the shaded Wangwang seedlings should be properly controlled. If the leaves are not light, they do not have to be applied. Jointing fertilizer. In addition to applying nitrogen fertilizer at jointing and booting stage, potassium fertilizer should be added appropriately, which is conducive to stem enrichment and good differentiation of young panicles.
Adding foliar fertilizer to promote the late-sown wheat to compete for effective panicles and increase 1000-grain weight. In the heading to milk-maturing period of wheat, 100-150 g of potassium dihydrogen phosphate can be used per mu, and spraying 50-75 kg of water can increase The number of grains promotes early maturity and increases yield.
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