There are only 3 to 4 main stems of late-sown wheat before winter, and the average vegetative growth before winter is less than 4 leaves. Most of the wheat seedlings cannot tiller before winter. They should be applied universally and early to increase seedling fertilizer to promote early and fast growth of wheat seedlings. In the low temperature stage in winter, the release of ammonium bicarbonate is fast and the fertilizer supply is rapid. See the seedlings to topdress 7.5-10 kg per mu, or urea 4-5 kg ​​per mu. Combining cold soaked fields and flooded paddy fields with topdressing nitrogen fertilizer can supplement 10-15 kg of superphosphate per mu to improve cold resistance and promote the growth of wheat seedlings.
Topdressing wax fertilizer
Late-sown wheat has weak cold resistance and is prone to low temperature and freezing damage. Topdressing wax fertilizer can use the heat released by organic fertilizer-based farmyard manure to prevent cold and keep warm. If conditions permit, apply 1500-2000 kg of manure or soil fertilizer per acre. Spread between the rows of wheat seedlings, or apply 8-10 kg of urea per mu. In addition to supplying a small amount of wheat seedlings for slow growth in winter, it can also play a role in winter application and spring, promote the long roots of wheat, early return to green, and consolidate the tiller before winter. , To promote spring tillering. Adequate application of base fertilizer can appropriately reduce the amount of wax fertilizer to prevent the increase of ineffective tillers in the later period, the population is too large, and the internodes are elongated and cause later lodging, which is not good for high and stable production.
Clever application of green fertilizer
The effective tillering period of late sowing wheat is 15 to 30 days longer than that of suitable sowing. Appropriate application of green fertilizer is beneficial to striving for early spring tillering. Therefore, for late-sown wheat fields with insufficient tillers, the green fertilizer can be applied early from the end of February to the beginning of March, so that the application can be based on the wheat. Each acre can be applied with 3 to 5 kg of urea or 10 to 15 kg of ammonium bicarbonate, and 500 to 750 kg of human feces and urine fertilizer can be applied. For wheat fields with obvious defertilization and wheat seedlings with severe freezing damage, 15 kg of ammonium bicarbonate per mu or 100 to 150 ml of Huimanfeng active liquid fertilizer can be used, and 40 to 50 kg of water can be sprayed. For phosphorus-deficient wheat fields, 10-15 kilograms of superphosphate per mu is supplemented. For wheat fields with fertile soil or ample bottom, when the temperature is high and the moisture content is sufficient, there is early detection of late sowing wheat. The application of topdressing should be controlled after spring to prevent lodging in the later period.
Reapplying jointing booting fertilizer
During jointing of wheat, if the application of basal fertilizer and wax fertilizer is low but is late sowing, re-fertilization should be paid attention to, especially for the lack of population development at jointing, early yellowing, narrow thin and straight leaves, etc. , It is more important to apply fertilizer in time and early, combining fertilizer and water, and 6 to 8 kg of urea per mu can be applied. Properly control the vigorous and growing seedlings with large populations, dark green leaves, drooping leaves, and sluggish leaf color at the time of jointing, but with heavier shade. If the leaf color does not fade, do not apply Jointing fertilizer. In addition to the application of nitrogen fertilizer at the jointing and booting stage, potassium fertilizer should be appropriately increased, which is conducive to the fullness of stalks and good development of young ears.
Increase the application of foliar fertilizer
In order to promote more effective ears of late sowing wheat and increase the thousand-grain weight, 100-150 grams of potassium dihydrogen phosphate per mu can be used from the heading to milk maturity period of wheat. Spray 50-75 kg of water to increase the number of grains and promote early maturity. ,Increase production.
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