甘薯新品种龙薯15号高产栽培模型研究

[目的]为甘薯品种龙薯15号配套高产栽培提供依据,为其推广提供技术支持。[方法]采用4因素5水平二次通用旋转组合设计方法,探讨密度及氮、磷、钾施用量对甘薯产量的影响。[结果]4个因素对龙薯15号鲜薯产量影响大小的顺序为：钾肥>氮肥>密度>磷肥。密度与氮肥互作对甘薯产量的影响效应最大,磷、钾肥互作的影响效应较小。在一定范围内,增加密度及氮、磷、钾肥施用量均可提高甘薯产量。在该试验条件下,龙薯15号的最高理论产量为60.24 t/hm2。[结论]龙薯15号产量在50.00 t/hm2以上时的农艺措施为：密度5.83万~6.08万株/hm2,施氮肥132.48~148.19 kg/hm2,施磷肥40.59~49.41 kg/hm2,施钾肥184.73~215.93 kg/hm2。

Study on the High-yielding Cultivation Model of New Sweet Potato Variety-Longshu 15

[Objective]The basis for high-yielding cultivation of sweet potato variety—Longshu 15 and technical support for its popularization were provided through the experiment. [Method] The effect of planting density, nitrogen, phosphorus and potassium application on Longshu 15 yield was analyzed based on the quadratic general rotary design with four factors and five levels. [Result]The order of various factors impacting Longshu 15 yield was K fertilizer >N fertilizer>planting density> P fertilizer. The biggest effect on yield was from the interaction between plant-ing density and N fertilization and others was smaller. Within a certain range, with the planting density of nitrogen, phosphorus and potassium fer-tilizer-increasing, the yield couldbe increased. Under the experimental condition, the maximum theoretical yield of Longshu 15 was 60. 24 t/hm2 . [Conclusion] For Longshu 15 yield of over 50.00 t/hm2, the agronomic measures were as follows:the planting density was at 5.83 ×104 -6.08 × 104 plants/hm2;N fertilizing, at 132. 48-148. 19 kg/hm2;P2 O5 , at 40. 59-49. 41 kg/hm2 and K2 O, at 184. 73-215. 93 kg/hm2 .