Generally, the amount of topdressing fertilizer in spring wheat field is 15-25 kg of urea, and 50-75 kg of carbonic amine can be used. The top-dressing top dressing should be based on top dressing. The specific amount to do "four combinations": First, combined with the application of base fertilizer. If the amount of base fertilizer is as recommended by us when wheat is sown, and the ratio of N, P and K is reasonable and the total amount is sufficient, then you can apply more fertilizer in the spring to strive for high yield. If the amount of base fertilizer in wheat is insufficient or not matched, especially if the application of phosphorus and potassium fertilizers is insufficient, then there is no need to chase too much nitrogen fertilizer, so as to avoid waste and cause late-maturing gluttony. The second is the combination of seedlings. Before the winter, Wang Miao, due to the consumption of more nutrients before the winter, can recover some nitrogen fertilizer in the spring. The third is to combine the ability of soil to retain water and fertility. Leakage of sand to the water and fertilizer is poor, the need for watering more times, in order to increase fertilizer utilization, need to be top-dressing, can increase the total amount of fertilizer. The fourth is to combine management needs. If fertilization is required for returning to the green period, wheat will need to be replenished at least twice in the spring. Therefore, it is also necessary to appropriately increase the total amount of spring dressing.
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