Abstract
SUMMARY: The experiment was conduted to evaluate a mathematical model for measuring the leaf area of common bean cv. Perola using the parameters length and width. The measures of leaf area performed in collected leaflets of plants cultivated in vases. The real leaf area was determine using a planimeter, Koizumi brand model - KP - 27 and determined the area of photocopies of leaflets. Was evaluate eight theoretical models, with equations of potential and linear types (intercepting the origin), as to the accuracy to estimate leaf area from measurements of width and / or length of each leaflet. From the results it appears that there is high correlation between the measured and estimated leaf area. As the length and width of the leaves are suitable for estimating the leaf area of bean cv Perola quickly and without the need for collect leaf. The equations of potential type has a better fit for all models except the product of length by width in which the linear fit also show excellent correlation.
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