为了研究氯化钾对甘薯生长发育、产量和品质的影响，探求其作用的最佳施用量。以4种甘薯栽培品种为研究对象，通过大田试验探究不同氯化钾用量对甘薯块根结薯数、单薯重、干物质积累动态变化以及品质等指标的影响。结果表明：施用氯化钾显著提高4种甘薯的产量，最大增幅达到47．24％～116．36％；随着氯化钾施用量的不断增加，甘薯的产量均呈现先增加后逐渐降低的趋势；甘薯产量均与甘薯单株结薯数和单薯重呈显著正相关，即氯化钾对甘薯产量的提高是通过增加甘薯的结薯数和提高甘薯的单薯重来实现的，但不同品种间存在差异。适量氯化钾肥显著提高甘薯块根中的淀粉、可溶性糖、可溶性蛋白含量，但当氯化钾含量超过562．5 kg／hm2时，品质指标的提高率有所降低。综合考虑产量、甘薯品质及经济效益因素，在大田条件下氯化钾的用量不宜超过375．0 kg／hm2。%In order to study the effect of potassium chloride on growth and yield of sweet potato ,this paper stud-ied the effects of different dose of potassium chloride on the growth ,yield and other factors of four sweet potato ,to explore the most suitable dosage effect .The results showed that there were some differences of the yield and quality characteristics of sweet potato varieties on potassium chloride .The four kinds of sweet potato yield were significantly increased by potassium chloride .The maximum growth range was by 47.24%to 116.36%.However,sweet potato yield value were changed in "parabola"path,to increase ,then lower;number of sweet potato tuber and single potato weight were significantly positively correlated to fresh potato yield .It was illustrated that potassium chloride in-creased sweet potato yield , because of number of sweet potato tuber and single potato weight increased , then they were some differences between sweet potato varieties .A certain amount of potassium chloride could significantly im-prove the potato tuber starch content ,soluble sugar content and soluble protein content ,but when potassium chloride content was exceeded 562.5 kg/ha,the growth rates of sweet potato quality parameters were reduced .The amount of potassium chloride was not more than 375.0 kg/ha,which was very appropriate considering some factors ,such as the yield,quality and economic benefit in sweet potato .
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