May 21 is a small full festival. In the small full season, the central and southern parts of China must grasp the planting of rice. Regarding the principle of rice fertilization in the field, in general, phosphate fertilizer is often applied as a base fertilizer and a seed fertilizer. Potassium fertilizer can be applied as a base fertilizer, but in sandy soil or super high-yield cultivation, potassium fertilizer should be divided into base fertilizer and top dressing. The technology of nitrogen fertilizer application is more complicated and can be divided into three kinds. For double-season rice, the peak of absorption is formed 2 to 3 weeks after transplanting. Therefore, it is necessary to apply the tiller fertilizer in time, usually 40% of the full-time nitrogen fertilizer, and the other 60% of the nitrogen fertilizer is applied before planting. In the base fertilizer. For single-season rice, the first absorption peak appeared in 2-3 weeks after transplanting, and the second absorption peak appeared in 7-9 weeks. Therefore, the single-season rice is best to be topdressed twice, the first time to apply 20%-25% of all nitrogen, and the second time to apply 25%-30% of all nitrogen. The characteristics of hybrid rice are from the tillering to the booting stage, and the topdressing is also carried out in stages. The second top dressing is carried out before and after heading. At this time, it is necessary to see the seedling fertilizer of Miao Zeng application, and the grain fertilizer should generally apply nitrogen fertilizer and potassium fertilizer, so that the plant maintains a high nitrogen and potassium nutrient level in the late growth stage, in order to increase the seed setting rate and 1000-grain weight.
Winter wheat is mainly grain filling in the small full throttle, from the milk ripening stage to the mature stage. At this time, the green leaf area should have a high photosynthesis efficiency, and the photosynthesis products in the leaves should be transported and accumulated smoothly into the grains, so as to achieve the goal of high grain yield and high yield. At this time, it is necessary to prevent the leaf from losing weight due to premature aging, and the technique of root dressing is mainly used. Because the root system is not as good as the early stage, it is necessary to use the method of spraying soluble fertilizer on the foliage. The type of fertilizer is preferably potassium dihydrogen phosphate (use concentration 0.2%-0.5%) plus urea (0.5%-1%). The amount of fertilizer applied per mu is about 50 kg, and the total spray is twice, at intervals of 4-5 days. .
In addition to foliar application of nitrogen, phosphorus and potassium fertilizer to promote the fullness of wheat grains, in areas where there are dry hot winds, in super-high-yield cultivation and over-sized wheat fields, in order to prevent lodging caused by reduced yield, foliar spraying of silicon fertilizer and Humic acid fertilizer solution. The concentration of both uses is about 1%. These two fertilizers can act as a strong stalk to reduce the problem of severe lodging and burning green leaves caused by dry hot air in the later period.
(Professor of China Agricultural University Cao Yiping) Source: People's Network
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