Abstract
Growth analysis has been used to evaluate various sugarcane varieties for their drought resistance capacity under field conditions. Net assimilation rate ( NAR) and relative growth rate ( RGR) were high during early growth phases, but declined with the age of the crop. Leaf area ratio ( LAR) and leaf area index ( LAI) were enhanced with crop growth under normal irrigation (Nw) while drought (D) caused reduction in the leaf area production and LAI in varieties Co 349, Co 453 and Co 997. Environmental parameters such as air and soil temperatures were positively correlated with NAR while negatively related to leaf area production. Relative humidity (RH), rainfall during the crop season and number of rainy days had positive influences on leaf growth and LAI. Specific leaf area ( SLA) or specific leaf weight ( SLW) did not show a regular behaviour in either normally irrigated or moisture stressed conditions.
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