Spring sowing fertilizer should choose diammonium

Fertilizer is a fertilization method in which a small amount of fertilizer is applied to the vicinity of the seed at the time of sowing. The role of seed fertilizer is to ensure that the spring crops are seedlings and seedlings, the amount of seed fertilizers can not be more, the proportion of nutrients is mainly phosphorus, and a small amount of nitrogen is used. The commonly used varieties of fertilizers are mainly phosphorus, with a small amount of nitrogen. The commonly used seed fertilizer variety is diammonium phosphate. Although the amount of fertilizer is not much, it can play the role of “four or two.”

The key to the application of fertilizer is to pay attention to the fertilization position in addition to the appropriate amount. A small amount of fertilizer should be applied 3 to 5 cm below the seed. Avoid placing the fertilizer close to the seed. Otherwise, even if the quantity is appropriate, the problem of burning may occur. . Under the conditions of mechanical sowing, the seeds and fertilizers should be sown separately from the two reserve tanks and the two lower tube so that the fertilizer and the seeds are not on the same plane to ensure safe emergence.

Not all nitrogen fertilizer varieties are suitable for seed fertilizers. It is necessary to strictly control the nitrogen application rate of seed fertilizers and to select nitrogen fertilizer varieties. Elemental nitrogen fertilizer and ammonium sulfate are suitable as seed fertilizers, while ammonium bicarbonate, ammonium chloride, ammonium nitrate and urea are not suitable. In recent years, the lessons of burning seedlings caused by improper application of fertilizers in various places are worth learning. For example, the use of high-tower high-nitrogen compound fertilizer as a seed fertilizer, where the amount is large (more than 10 kg / acre) and the fertilizer is not deep into the soil, there are different degrees of inhibition of seedling growth. The compound fertilizer is better to use diammonium phosphate as a seed fertilizer, and the seedling is safe and vigorous in seedling stage.

(Jia Youjiang, Agricultural Bureau of Yucheng County, Shandong Province)

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