河西走廊盐化潮土钾肥对马铃薯增产效应的研究

在河西走廊盐化潮土上,连续3年的研究结果表明增施K肥可以显著提高马铃薯的产量,马铃薯的产量随K肥用量的增加而增加,而增产效果则随K肥用量的增加而递减。经回归统计分析,K肥经济效益最佳施肥量为239.70kg/hm2,理论产量为63.45t/hm2;K肥成本599.25元/hm2,收益3.75万元/hm2;不同处理间差异显著性经LSR检验达到显著和极显著水平。K肥对马铃薯的增产效果与土壤速效K含量呈负相关。

EFFECT OF K FERTILIZATION ON YIELD OF POTATO IN SALINIZED FLUVO-AQUIC SOIL IN THE HEXI CORRIDOR REGION

Results of a 3-year long experiment on salinized fluvo-aquic soil in the Hexi Corridor region indicate that K application significantly raised the yield of potato, which increased with the rate of K application. But the production-increasing effect of K application decreased with the increase in application rate. According to regression statistical analysis, the optimal economical K application rate is 239.70 kg/hm2. In this case the theoretical yield is 63.45 t/hm2, the cost of K fertilizer, 599.25 yuan/hm2, and the profit of the crop, 37,500 yuan/hm2. The difference between treatments was significant and extremely significant based on LSD analysis. The crop response of potato to K application was negatively correlated to concentration of soil readily available K.