Direct Estimation of the Index of Foliar Area IN Sugarcane in Cuba
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Abstract
The leaf area index (LAI) is a dimensionless quantity that characterizes the canopy of an agro-ecosystem, determines and controls the interception of rainfall, radiation, the exchange of water vapor and CO2. It constitutes an important adjustment factor in growth models. Due to the importance of LAI in sugarcane, the present work aims to calculate the sample size necessary to determine the leaf area of the stems present in one meter and of this way estimate the LAI. The study was carried out at the Artemisa-Mayabeque Sugar Cane Experimental Station, using sugarcane cultivars: C1051-73, CP52-43, C90-469, C86-12, C86-56 and C323-68. The leaf area of all stems was measured over three meters at random. The number of stems or sample size for the leaf area measurements was determined in meters with more than 20 stems of different lengths and canopy area by calculating the standard deviation in groups from two to nine leaf area values, with the Excel program. It was determined that just measuring five stems∙m-1 is enough to determine the area of one meter. This constitutes a considerable saving of time if we consider meters with averages of more than 20 stems. It is recommended to include this result in the Procedures Manual of the Genetic Improvement Program.
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