重庆紫色甘薯高产优化技术研究初探

目的]对3个紫色甘薯品种渝紫43、渝紫263和万紫56进行肥料、密度试验,并初步比较3个紫色甘薯品种的产量关系,旨在得出最佳的栽培密度及施肥量,以便为重庆市紫色甘薯高产优质栽培提供理论依据。方法]采用L9（34）正交试验设计,小区处理为：施肥（A）,300kg/hm2-（A1）、600kg/hm2（A2）、900kg/hm2（A2）;密度（B）,45000株/hm2（B1）、60000株/hm2（B2）、75000株/hm2（B3）;品种（C）,万紫56（C1）、渝紫43（C2）、渝紫263（C3）。结果]①密度对紫色甘薯产量的影响大于肥料对紫色甘薯产量的影响,即B〉C;②密度对紫色甘薯产量的影响为K3〉K1〉K2;③肥料对紫色甘薯产量的影响为K1〉K2〉K3;④相同条件下三个紫色甘薯的产量表现为K1〉K3〉K2。结论]在3个紫色甘薯品种中,万紫56产量最高,其次是渝紫263,最后是渝紫43。该试验最佳的栽培密度为每公顷为75000株,最合理的施肥量为每公顷300kg。

Optimal Technique for High Yield of Purple Flesh Sweetpotato in Chongqing

Objective] The aim was to obtain the best planting density and the best fertilizer of purple flesh sweetpotato so as to provide theoretical basis for breeding of high yield and quality of purple flesh sweetpotato in Chongqing.Method] The effects of fertilization,planting density and variety on yield of purple flesh sweetpotato were studied by orthogonal test of L9(34).Residential treatment was:fertilization(A),300 kg/hm2(A1),600 kg/hm2(A2),900 kg/hm2(A2);density(B),45 000 Plants/hm2(B1),60 000 Plants/hm2(B2),75 000 Plants/hm2(B3);species(C),Wanzi 56(C1),Yuzi 43(C2),Yuzi 263(C3).Result] The yield of Wanzi 56 was the highest among three purple flesh cultivars on conditions that planting density was 75 000 plants/hm2,and fertilization was 300 kg/hm2.The influence of planting density for yield of purple flesh sweetpotato was higher than that of fertilization.The orders of different levels of various factors on the test results was A factor column,K1>K2>K3;B factor column,K3>K1>K2;C factors column,K1>K3>K2.Conclusion] The yield of Wanzi 56 was highest,follow by the yizi263 and yuzi43.The optimum planting density was 75 000 plants/hm2,and the most reasonable amount of fertilizer was 300 kg/hm2.