See seedlings, apply wheat, return to green fertilizer

July 10 23:01:35, 2024

After the winter wheat returned to green, it immediately entered the growth stage with roots, leaves and alfalfa. In terms of nitrogen nutrient absorption, although the quantity requirement was not too much, the yield level of winter wheat in that year was very sensitive to the response of nitrogen nutrient supply or lack of supply during this period. In the critical period of nitrogen nutrition, nitrogen deficiency is insufficient, roots are small, seedlings are small, especially small, and the population is not enough, and it is difficult to obtain high yield. In this period, if there is too much nitrogen fertilizer, the leaves are large, the leaves are too large, the group is too large, and the consumption is too much. In the future, the kernels will be small, the grain weight will be light, and it will be difficult to obtain high yields when it is late. Therefore, in the case of normal seedlings, the total amount of topdressing nitrogen fertilizer should be controlled within the range of 6-8 kg/mu of pure nitrogen.

As for when to topdress, chase once or chase twice, this depends on the seedlings at that time, but also to look ahead. The main indicator of seedlings is to look at the group status, and the number and quantity of nitrogen-seeding fertilizers should be determined according to the group status. The so-called "forward and after-care" refers to the need to consider the base fertilizer pursuit and seedling growth for the first time. If the nitrogen fertilizer in the base fertilizer is too much, the wheat seedlings are too strong before winter, the springs are less chased, the late-seeding nitrogen fertilizer, or the Wangmiao consumption is too much. Fertilize early. Otherwise, problems will occur in the early stage of the wheat grain or in the mature stage. On the contrary, late-sown wheat, weak seedling state should be early fattening, promote tillering, normal body seedlings to catch up with a fertilizer, such as the use of urea 15-20 kg / acre, and for strong gluten wheat, it must Add a top dressing during the flowering period, and apply urea 4-5 kg/mu to increase the protein content of wheat.
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