Due to the early low temperature, the release of phosphate fertilizer is generally slow, so it is appropriate to topically apply diamine in top dressing. The urea should be applied more early, according to its own target yield, determine the amount of urea, generally 15-20 kg, can be applied twice, the first time in the 8-leaf stage topdressing urea, the amount of total fertilizer in the amount of 50%-60%, big bell mouth topdressing the second time.
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