通过田间试验，设置了平衡施肥和常规施肥及相应的缺肥试验、氯化钾替代硫酸钾处理，研究了不同施肥处理对冬作马铃薯的肥效．结果表明：平衡施肥处理对冬作马铃薯的综合效应优于常规施肥处理，主要表现为商品薯产量、经济效益、磷素表观利用率和维生素的质量分数等参数分别比常规处理高4451 kg/hm2、8984元/hm2、33.1％和42.8 mg/kg．用氯化钾替代硫酸钾，产量、经济效益和氮素表观利用率会降低，特别是商品薯产量和氮素表观利用率显著下降（P＜0.05）．建议在供试条件下选用硫酸钾作为冬作马铃薯的主要钾源效果更好．%Field experiments of treatments concerning balanced and conventional fertilization , including lack of N or P or K fertilizer , using potassium chloride to replace potassium sulphate were set up .The re-sults showed that the comprehensive effects of balanced fertilization were better than those of conventional fertilization;balanced fertilization had a significantly higher marketable potato yield , 4 454 kg/hm2 , eco-nomic profit , 8 984 RMB Yuan/hm2 , apparent phosphorus element use efficiency reaching 33.1% and Vc content, 42.8 mg/kg.When using potassium chloride to replace potassium sulphate , the yield, eco-nomic profit and apparent nitrogen-element use efficiency ( ANEUE ) would be lower , in particular mar-ketable potato yield and ANEUE decreased significantly at 0.05 level.It was suggested that under the conditions tested , potassium sulphate should be selected as the main potassium source .
展开▼
