4, apply early reach control fertilization. Seedling stage applies nitrogenous fertilizer best, profit grows quickly at vegetable early hair, reduce content of nitric acid salt. Every mus of control is in 15 kilograms inside, best 2/3 do base manure and organic cooperate employ character, 1/3 make top application. Make urea had better not be applied when top application of face of blade additionally, because ion of the ammonium in urea and air contact are easy,accumulate saltpetre salt.
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