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The method here proposed, nominated of leaf area - Federal University of Tocantins (AFUFT) fill out these flaws and bases on three measures of the leaf (total length, leaf blade base width and leaf blade middle width), decomposing it in a triangle and a trapeze for calculate of LA. AFUFT (method II) was compared with three methods: method I - indirect, with use of apparel of luminous interception (SunScan®); method III – direct, segmented the leaf in parts of 10 cm, followed by measure of segments blade middle width; method IV - direct, used scanners and computer software (here considered as standard method). The four methodologies were set up in a randomized block design, being the blocks the 24 stonemasons (4.0 m x 1.0 m) of Urochloa brizantha cv. "Marandu". The AFUFT presented the largest correlation coefficients (r= 0.99; p<0.05) with the standard method. The method I overestimated LA and LAI and the method III underestimated these variables. For obtaining the leaf area of tropical grasses, the method here presented is an promising, practice and agile tool, in relation to the other studied methods.

Método prático e eficiente para estimar a área foliar de gramíneas forrageiras tropicais