Regression relationship between growth variables, yield components versus tube fresh yield
Regression analysis was conducted on growth parameters, yield components versus yield. Significant positive regression was found between plant height at 8, 16 and 40 WAP, stem weight, tubers per plant and yield (Table 7), but not with stems per plant. The results suggest that the growth responses recorded accounted for yield differences detected. It is of interest to note significant relationship for plant height vs. yield at an 8 weeks after planting, as this indicates that good early growth is important for yield, confirming the role of fertilizer in increasing yield. The importance of the other parameters to yield has been discussed earlier.