播期、密度及品种对旱地免耕稻草覆盖马铃薯的影响

The effects of sowing date,density and breed on non-ploughed potato covered with straw

为了探索贵州省中海拔地区生态条件下,不同播期、密度和品种对旱地免耕稻草覆盖马铃薯产量的影响,本试验采用了3因素3水平正交试验,并对试验结果进行方差分析。结果表明,播期对产量影响的F值为2.27,表现为不显著;密度对产量影响的F值为3.97*,表现为显著;品种对产量影响的F值为55.64**,表现为极显著。因而得到影响产量的因素主次顺序为:品种>密度>播期,并得到最优高产处理组合为A2B2C3,即在贵州省中海拔地区生态条件下,种植免耕稻草覆盖马铃薯要获得高产,应选择中晚熟品种中甸红,播期为2月12日,密度为4 500株.667m-2。

The experiments have been conducted by using orthogonal design in order to understand the effects of sowing dates, density and breeds on yield of non-ploughed potato covered with straw in the conditions of the middle altitude of Guizhou province. Through the analysis of variance, the conclusion was as follows ; the impact that Sowing dates act on yield is not remarkable and the F is 2.27 ;the impact that density acts on yield is remarkable and the F is 3.97^＊;the impact that breeds act on yield is extremely remarkable and the F is 55. 64^＊＊. So we can get the primary and secondary order of factors ：breeds 〉 density 〉 sowing dates and the most high yield treatment combination is A2B2C3. It means that in the conditions of the middle altitude of Guizhou province if we plant non-ploughed potato covered with straw and get high yield ,we should choose breed of Zhongdianhong,sowing date on Feb. 12 and density of 4 500 plants·667m^-2.