高海拔干旱山区钾肥不同用量对马铃薯的施用效果

[目的]为干旱山区马铃薯的合理施肥提供科学依据。[方法]以乐薯1号为材料,在氮磷肥用量一致的情况下研究不同钾肥用量（0、60、120、180、240 kg/hm^2）对其产量及经济效益的影响。[结果]施钾处理后马铃薯的产量均高于对照。施钾肥后马铃薯的产量和商品率分别较对照高21.1%-49.6%和2.8%-11.8%。在一定范围内,钾肥用量越多马铃薯产量和商品率越高,但钾肥用量增加到一定限度后,随钾肥用量增加马铃薯产量呈下降趋势,当钾肥用量为120 kg/hm^2时,马铃薯产量最高（50 544 kg/hm^2）,经济效益最好（较对照增收7 775.28元/hm^2）。[结论]钾肥用量与马铃薯的效应方程为y=2 193.01＋227.82x-12.65x^2,由此求出干旱山区马铃薯最高产量的钾肥用量为135 kg/hm^2,最佳经济效益钾肥用量为130.5 kg/hm^2。

Application Effects of Different Amount of Potassium Fertilizer on Potato in High Altitude and Arid Mountain Area

[Objective] The aim was to provide the scientific basis for reasonable fertilization for potato in arid mountain area.[Method] With Leshu 1 as the material,on the basis of the same amount of nitrogen and phosphorus fertilizer,the effects of different amount of potassium fertilizer(0,60,120,180,240 kg/hm2)on the yield and economic benefit of potato were sutdied.[Result] The yields of potato in treatments with potassium fertilizer application were all higher than that of CK.After potassium fertilizer applicat...