Corn yield evaluation by color-infrared film

Abstract

The traditional system of yeld forecasting utilizes technical reports from different resources. The collect of informations begins before the planting, period and the estimatives are adjusted during the development of the cultures. The present work, intends to show the possibilities of the color infrared film in the yeld forecasting of the corn. The quantitatives informations was obtained though the transmission density. The work was conducted en São Manuel Experimental Farm of -Faculdade -de Ciências Agronômicas - Campus de Botucatu - UNESP. The six trials consisted in different manure quantities, with probable yeld differences. The culture was photographed with color film (Kodak Ektachrome 64 ASA) and color infrared film Kodak Ektachrome Infrared Film) and the optical density was measured with a transmission microdensitometer, Weston, model 877 with a aperture of 0,8 mm. The interation between Yeld and Optical Density was analysed through correlation and linear regression. The analysis of the results led to the following main conclusions: a) after the necessary calibrations, the color infrared film, can be used in the yeld forecasting of the corn; b) the quantitative interpretation of the results through transmission density, suggest the application of this method in other types of cultures.