The normal growth of wheat at the time of application is generally from late February to early March. During the first quarter, the elongation of the wheat is stopped and the second season begins to rise. At this time, if there is a clear internode in the hand, it will not cause the roots of the roots to grow too long. However, if the leaf color is prematurely yellowed at the jointing stage, the yellowing time will be 7-10 days or more, the plants will be thin, and the wheat fields with few tillers shall be topped 5-7 days ahead of time; if the leaves are dark green, the leaves are drape, and the plants For wheat fields with huge populations and still proliferating tillers, it is advisable to postpone applying for 7-10 days, and to use less or no quick-acting nitrogen fertilizer to avoid excessive birth.

Application of normal wheat seedlings in the amount of about 8-15 days leaves, each cultivating 5-7.5 kg of urea and potassium chloride; 6-8 leaves of thin or late seedlings, urea 7.5-10 kg per acre topdressing Or ammonium bicarbonate 15-20 kilograms; 10 leaves more than the long seedlings, per acre should be topdressing phosphate and potash 5 - 7.5 kg each, do not apply or less nitrogen fertilizer. For thin and thin seedlings, late seedlings, late seedlings, de-fertilized seedlings and other fields, fast-acting ammonium bicarbonate should be preferred when dressing. However, in the application of ammonium bicarbonate, we must pay attention to the following two points: First, the use of fine soil must be mixed; Second, the morning dew dry after the top dressing, so as not to produce fertilizer damage. The amount of top dressing is generally 20-25 kg per mu.

When the method of application is dry and dry, it is required to open the ditch or apply a cave, and immediately cover the soil after application to prevent the loss of volatile fertilizer. In continuous rainy and cloudy days, the urea or potash should be spread and covered with shallow soil; When urinating, you should dip the water.

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