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1.看土追肥追肥要由土壤的性质而定。低洼地和碱地,要选用硝铵、硫酸铵、过磷酸钙等酸性或生理酸性肥料作追肥;酸性土壤应选用尿素、碳酸氢铵等碱性肥料作追肥,对保水、保肥能力差的砂壤土,应选用不易挥发的硝酸铵或尿素作追肥。2.看势追肥因土质、肥料和水利等条件不同,虽然同
1. See top dressing fertilizer to go by the nature of the soil may be. Low-lying and alkaline, to use ammonium nitrate, ammonium sulfate, superphosphate and other acidic or physiological acid fertilizer for top-dressing; acidic soil should be used urea, ammonium bicarbonate and other alkaline fertilizer for top-dressing, water retention, fertilizer and poor performance Sand loam, should be used not volatile ammonium nitrate or urea for top dressing. 2. See potential dressing due to soil conditions, fertilizers and water conditions are different, although the same