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中文摘要：
通过设置在定西市李家堡镇的钾肥后效定位试验,对2007—2010年不同施钾水平基础上实施的马铃薯干物质和产量的后效进行研究,结果表明：不同施钾水平对当季马铃薯干物质量有一定的后效应,钾肥用量增加到一定程度时,根、茎、叶干物质量开始下降,块茎干物质量则呈现持续增加的趋势;不同施钾水平对当季马铃薯产量的影响非常明显,其中施钾105 kg/hm2时（K3）产量最高,施钾140 kg/hm2时（K4）产量最低,按产量大小依次为：施钾105 kg/hm2处理〉施钾70 kg/hm2处理〉施钾35 kg/hm2处理〉不施钾处理〉施钾140 kg/hm2处理（K3〉K2〉K1〉K0〉K4）。当施钾肥量为105 kg/hm2时产量最高,即为最佳施肥量。
英文摘要：
By setting up the after-effect positioning test of K in Lijiabao town of Dingxi city,with different levels of implementation of K in the consecutive for 2007—2010,the potatoes dry matter and the grain yield of after-effect were studied.The result showed that different potassium levels had some after-effects to the content of this season potatoes＇ dry matters,when the use of fertilizer application rates increased to a certain degree,then the roots,stems,dry matter content began to fall,the tubers of dry matter content of potatoes had a trend to be increasing.The production of this season potato were obviously influenced by different levels of K.The K3 treatment had the highest yields,while yields of K4 were the minimum.Sorting the production size showed that K3K2K1K0K4.When fertilizer application rates came to 105 kg/hm2,the yields of potato attained the highest,that was the best fertilizer application rates.
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