4种因素对"龙薯3号"秋薯产量及产量构成的影响

良种要有良法,为了确保能充分发挥新品种优良特性,加快推广步伐,在推广利用中提供科学依据,对秋薯"龙薯3号"进行了栽插密度、施氮量、施钾量及氮肥施用法四因素正交高产试验,结果表明,组合3(A1B3C3D3)即每666.7m2插植3000株、施氮12 kg、施钾18 kg,氮肥施法采用前多后少为最优组合,小区平均产量最高达68.4 kg;其次为组合7(A3B1C2D2)即每666.7m2插植4000株、施氮8kg、施钾18kg,氮肥施法采用等量分施,小区平均产量达65.2 kg.施钾量对产量的影响最大,其次是栽插密度和施氮量,氮肥施用法的影响最小.同时,就不同种植密度对产量结构的影响做了简要分析.

Effects of Four Factors on Fall Sweet Potato Yield and Yield Composition of Longshu3

The improved variety should have good methods, for using new variety's good characters and speed-ing up the steps of extension, affording scientific basis during extension. In this research, fall sweet potato of Longshu3 was analyzed by using the four factors orthogonal test on its plant density, N application, K applica-tion and application methods of N. The results showed that the combination 3 was the most superior plan, its most average yield was 68.4 kg with 3000 seedlings per 666.7 m2, N application was 12 kg, K application was 18 kg and application methods of N was more with early stage and few with later stage. The better plan was com-bination 7, its average yield was 65.2 kg with 4000 seedlings per 666.7 m2, N application was 8 kg, K applica-tion was 18 kg and application methods of N was equivalent with division. The K application was the most im-portant factor to the yield; the second factors were plant density and N application, and application methods of N. And the effects of different plant density on yield structure were analyzed briefly in this paper.