Resumo

BRITO, Esteban et al. Non-destructive methods for estimating leaf area per stalk in LCP 85-384 sugarcane variety. Rev. ind. agríc. Tucumán [online]. 2007, vol.84, n.2, pp.29-32. ISSN 1851-3018.

Non-destructive methods for estimating leaf area per stalk (AFT) in LCP 85-384 sugarcane variety were adjusted. During crop cycle, 1031 stalks were studied in terms of height with respect of leaf +1 dewlap (ALT+1) and number of green ligulated leaves (NHVt), and individual foliar surface (AFi) of all green leaves per stalk was determined. The observed leaf area per stalk (AFTO) turned out to be the sum of AFi values of all green ligulated leaves per stalk. Three alternatives for estimating AFT were evaluated: in Method 1, x= ALT+1 * NHVt; in Method 2, x= AFi_{(leaf +3)} * NHVt and in Method 3, x= AFi_{(leaf +3)} * NHVt * ALT+1. Regression equations were selected considering the coefficient of determination (R²), its statistical significance and the graphic display of observed and calculated values. The equation chosen for Method 1 was AFT= 6.791 x ^0.811 (R²: 0.951); for Method 2, AFT= 0.930 x (R²: 0.955) and for Method 3, AFT= 2.267 x 0.522 (R²: 0.958). Finding out the number of green ligulated leaves per stalk and stalk height with respect of leaf +1 basal ring, and/or measuring leaf +3 individual foliar area constitute methods which allow estimating leaf area per stalk in LCP 85-384 sugarcane variety during the whole crop cycle, in a non-destructive, quick and accurate manner.

Palavras-chave : Saccharum spp.; Non-destructive techniques; Regression models.

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