The drawbacks of traditional fertilization methods
The traditional wheat fertilization is generally divided into two times. The first time before wheat sowing, a part of nitrogen fertilizer is plowed into the ground with the cultivated land, which is called base fertilizer; the second time is the spring top dressing combined with spring watering. Base fertilizers generally account for 60%-70% and topdressing accounts for 30%-40%. The topdressing time is generally during the period of returning to the beginning of growing up, and there is an additional top dressing during wintering before pouring over the winter. In high-yielding fields, such fertilization time and bottom-dressing ratio will cause the wheat field population to be too large, the number of ineffective tillers to increase, the mid-fertility of wheat fields to be uncovered, the light transmittance of the wheat fields will be poor, and the lower leaves will not be able to use solar energy effectively, resulting in premature aging and greatly increasing the The danger of late lodging in wheat affects the yield and quality of wheat. In addition, due to the pre-harvest period of wheat, the roots are underdeveloped, and the number of secondary roots is small, it is difficult to effectively absorb nitrogen in the soil. Nitrogen is difficult to be fixed by the soil and will infiltrate deep into the soil with precipitation, making it difficult to be used by crops. .
Nitrogen fertilizer transfer technology promotes yield increase
The technique of post-fertilization of nitrogen fertilizers is to postpone the timing of topdressing nitrogen fertilizers in high-yield fields in wheat, and it usually moves to the jointing stage (mid-April). If the soil with high soil fertility is planted, the species with high tillering and spike rate can be moved to jointing stage to the tip of flag leaf, and the proportion of nitrogen fertilizer as base fertilizer is reduced to 50%, and the proportion of topdressing is increased to 50%. The proportion of base fertilizer in wheat with high soil fertility can be reduced to 30%-50%, and the proportion of topdressing is 50%-70%. This technology focuses the period and amount of nitrogen fertilizer application on mid and late wheat growth. Since the wheat root system is well developed, the growth rate is fast, and the amount of fertilizer is large, the nitrogen fertilizer has high absorption and utilization rate, and can effectively control invalid tillers. Excessive hyperplasia, shaping the flag leaves and the strong plant type of the inverted two leaves, allows the unit land area to accommodate more panicles, and at the same time can promote the roots to lower the bar, increase the deep root coefficient of the soil and the late root activity, which is conducive to prolonging the photosynthetic product to the grain. Transfer time, increase grain weight, improve quality, increase output.
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