Correlation analysis on selected traits of high-yield wheat

Correlation analysis was conducted among selected traits and yield of wheat from 47 fields with yield range of 7 243~ 10 610 kg·hm^?2 under stabilizing leaf-controlling plant type-increasing ear number (CPCE) management conditions using SPSS. The research task of this study was to determine the enabling and limiting factors of CPCE. Selected traits analyzed in this study include ear number per-unit-area, grain number per ear, grain weight, maximum grain volume, vascular bundle number per panicle and total vascular bundle number. Among three yield components (ear number per-unit-area, grain number per ear and grain weight), only grain weight is positively correlated with yield, suggesting that grain weight is the main determinant of yield under CPCE management. Positive correlation is also noted between grain weight and maximum grain volume. This implies that management measures to increase maximum grain volume can enhance grain yield. The positive correlation between ear number per-unit-area and total vascular bundle number suggests that high ear number per-unit-area ensures smooth flowing. Based on curve fitting, the regression equations for grain weight and maximum grain volume, and also for ear number per-unit-area and total vascular bundle number are respectively given as y = 12.925+0.479x and y =－14.231+2.685lnx.