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为了确定甘薯新品种龙薯14最佳钾肥施用量,优化甘薯生产综合施肥技术,采用田间试验,设计了7种在施用等量氮、磷肥的条件下,不同钾肥施用量对龙薯14产量影响的试验。结果表明:甘薯新品种龙薯14薯干与淀粉产量较高,薯形好,大中小薯比例适当,产量高,商品率达90%以上,抗病强,有较高的经济效益,适宜在福建省长汀县境内推广种植。在施用等量的氮、磷肥条件下,钾肥施用量对龙薯14的产量影响较大,鲜薯产量随钾肥施用量增加表现为先增加后下降的趋势。当亩施用18kg纯钾,即硫酸钾36kg时,龙薯14产量最高,达2 512kg/亩,取得的效益最好。这一结果为甘薯生产平衡施肥、配方施肥以及综合管理提供了参考依据。
In order to determine the optimum potash fertilizer application rate of the new sweet potato variety Potash14 and optimize the integrated fertilization technology of sweet potato production, seven kinds of fertilizer application were designed to evaluate the effects of different potash fertilizer application rates on the yield of Longshu14 under the condition of the same amount of nitrogen and phosphate fertilizer Test. The results showed that the sweet potato variety “Longshu14” had higher dry matter yield and starch yield, better sweet potato shape, larger size and medium size potato, higher yield, more than 90% commodity rate, strong disease resistance and high economic benefit, Changting County, Fujian Province to promote planting. Under the same nitrogen and phosphate fertilizer application rates, the amount of potash fertilizer had a great effect on the yield of Longshu14, and the yield of fresh potato showed the trend of first increasing and then decreasing with the increase of the amount of potash fertilizer. When the use of 18kg of pure potassium potassium, potassium sulfate 36kg, Longshu 14 highest yield, up to 2 512kg / mu, the best benefits achieved. This result provides reference for the balanced fertilization, formula fertilization and integrated management of sweet potato production.