长期不施钾肥对甘薯产量的影响

Effects of long-term non K fertilizer application on the sweetpotato yield

利用黄潮土肥料长期定位试验,研究长期不施钾肥对甘薯产量的影响。结果表明,长期不施钾肥,薯块膨大期迟后、日增重减少,导致鲜薯产量下降;与施钾处理相比,不施钾可提高薯块干物质含量,而单位面积干物质产量明显下降;长期不施钾肥条件下,不同甘薯品种的产量反应存在显著差异,以此筛选出高耐低钾力品种徐薯18、钾高效型品种徐薯25-2和钾敏感型品种苏薯7,可为品种选育和生产应用提供材料。

Effects of long-term non K fertilizer usage on the sweetpotato yield were studied by long-term stationary field experiment in yellow fluvo-aquic soil. The results showed that the long-term non K fertilizer treatment would delay the swelling period of sweetpotato storage root and reduce daily output, so as to cause the drop of fresh root yield. Compared with application of K fertilizer,non K fertilizer usage could increase the dry matter content of storage root, but the total output of dr）, matter in unit area would drop. There were differences in yield response of different sweetpotato varieties under the long-term non K iertilizer usage, and Xushul8 with high endurance of low-K stress and Xushu25-2 with high K efficiency and Sushu7 with K sensitive were selected preliminarily. It provides useful materials for breeding and production of sweetpotato.