Comprehensive evaluation of regional trial potato varieties by applying grey correlative degree analysis.

A total of nine characters including yield,growth period,plant height,marketable tuber rate,dry matter content,starch content,plant degeneration index,tuber ring rot rate,and potato late blight index in six potato varieties(lines),were evaluated by using grey correlative degree analysis in late-maturing potato northwest group ofthe Tianshuipilot site in 2008.The results showed that L0031-17 and Tian 99-5-4 both had a good performance ofcomprehensive traits.The weighted correlations ofthe two lines were close,0.720 and 0.716,while the equal-weighted correlations were 0.706 and 0.762,respectively.