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 agroecosystem, determines and controls the interception of precipitation, radiation, and the exchange of water vapor and CO2. It is an important adjustment factor in growth models. Due to the importance of the LAI in sugarcane, the present work aims to calculate the sample size necessary to determine the leaf area of the stems present in 1 m and thus estimate the LAI. The study was carried out at the “Artemisa-Mayabeque” Sugarcane Experimental Station, using the following sugarcane cultivars ´C1051-73´, ´CP52-43´, ´C90- 469´, ´C86-12´, ´C86-56´ and ´C323-68´. The leaf area of all the stems was measured in 3 m at random. The number of stems or sample size for 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 9 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 take into account meters with averages of more than 20 stems. It is recommended to include this result in the Manual of Procedures of the Genetic Improvement Program.
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References
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