ÍNDICE DE REFLETÂNCIA NA ESTIMATIVA DA ÁREA FOLIAR E BIOMASSA DAS FOLHAS EM FEIJÃOCOMUM

Abstract

The objective of this study was to determine the leaf area index (LAI) and leaf dry matter (LDM) of common bean from the NDVI and correlated them to crop yield. Two experiments were conducted in the field in 5/17/2013 and 07/03/2013, using the experimental design of randomized blocks, in which four genotypes, Pérola, BAT 477, BRS Pontal and BRS Agreste, were compared. The acquisition of NDVI occurred with field radiometric sensor and crop data were obtained from destructive samples. LAI and LDM estimated from NDVI showed a good performance, which similar values of statistical coefficients. The NDVI, for both sowing dates, saturated from 50 days after emergence, and it should be used mainly for the crop vegetative stage. Yield showed a statistical difference only between sowing dates, showing higher value in the first one. Based on the results of this study, it was concluded that LAI and LDM can be estimated by NDVI using a linear regression model. IAF and LDM observed and those estimated by this model correlated positively with common bean yield.

Keywords

• Phaseolus vulgaris
• reflectance
• sensing
• biophysical indicators