After the beginning of spring, winter wheat enters the green phase, and the period from green to flag raising is the spring growth phase, which generally lasts 50 to 60 days, which is a critical period for yield formation. After the wheat turns green, the growth becomes vigorous and the absorption of nutrients gradually increases. Therefore, topdressing jointing booting fertilizer is a top priority.
Fertilization in wheat fields in spring should be based on increasing the application of organic fertilizers and rationally use chemical fertilizers to increase fertilizer utilization and reduce soil pollution. Generally, high-yield fields can control nitrogen, stabilize phosphorus, increase potassium, and supplement microbes, while medium-yield fields can stabilize nitrogen and increase phosphorus, and apply potassium fertilizers in a targeted manner.
From the perspective of wheat physiology, from the stage of turning green to getting up, the plant continues to tiller, emerge leaves and roots, and begins to differentiate from young spikes, which is the most beneficial to consolidate strong seedlings before winter, fight for weak seedlings to become strong, and inhibit the growth of vigorous seedlings. Period. Therefore, it is very necessary to adopt different fertilization measures according to different types of wheat fields. Seeing seedling fertilization can be summarized in three words: protect, promote, and control.
Protect
A type of wheat field with "six leaves and one heart", four or five tillers, a total of 800,000 acres of stems, strong plants, normal leaf color, and non-yellowing wheat fields during the winter last year. Do not fertilize immediately after returning to green. Watering to prevent excessive growth and consumption of excessive nutrients is not conducive to high yield in the later period. For such wheat fields, measures such as hoeing, weeding, and prevention and control of diseases and insect pests should be adopted to ensure effective tillering and safe growth before the year, which is conducive to increasing the rate of wheat ear formation and lays a good foundation for high yield of wheat in the later period.
Field measures are mainly "protection", before and after the jointing period of wheat, fertilization and watering, which is the so-called nitrogen post-fertilization method, is conducive to high yield of wheat.
promote
Wheat fields with poor fertility conditions and insufficient base fertilizer a year ago; wheat seedlings are short in winter and there are few tillers; plants are weak when turning green, leaves are yellow, and the total number of stems per mu is less than 400,000 three types of wheat fields; or returning straw to the field If there is no overwintering water, the soil is loose and breathable, the water evaporates strongly, the soil is dry, and the wheat field has the phenomenon of hanging roots of the wheat seedlings, it is necessary to water the green water and apply the green fertilizer in time.
It needs to be emphasized that it is very important to choose the fertilizer for this kind of wheat seedlings! First, do not use or use less organic fertilizers. As the saying goes: Fertilize the land in captivity and use chemical fertilizers to promote seedlings. Due to the low temperature in early spring, the decomposition of farmyard manure is slow, which cannot meet the nutrient needs of wheat. Second, quick-acting chemical fertilizers should be applied, because chemical fertilizers have fast effects and can timely supply the needs of wheat growth and development. You can apply 10-15 kilograms of urea per acre, and pour it into green water. On this basis, foliar fertilizer can be sprayed once to promote new roots, cold resistance, drought resistance, and disease resistance, which is conducive to the transformation of weak wheat seedlings into strong seedlings. Third, pay attention to the weak seedlings in some high-yield fields when fertilizing, and apply eccentric fertilizer to make the growth of the entire field consistent, which is conducive to increasing wheat production.
control
Years ago, the planting was too early, the planting rate was too large, and flourishing wheat appeared. Due to premature sealing, leaf spreading, and leaves too large and thin, after turning green, it is necessary to adopt “control†measures for them. Row a hoe, try not to water, and squat down the seedlings. In addition, close attention should be paid to whether there is frost damage, and if there is frost damage, corresponding measures should be taken.
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