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The present paper had the objetive to imprive the knowledge for ecofisiological studies. With herbaceus cotton (Gossypium hirsutum L. r. latifolium Hutch.) taken into consideration a non destructive method to estimate the area and volume of the fruits that also had chlorophyll and take part actively is the photosyntesis as a modification in the method of Hozumi et al. (1955) to growth analysis. Through linear measures of the length and width of the fruit and using the general equation of the ellipse and of the revolution ellipsoid, it is possible to estimate the aiel and volume of the fruit accurately, and through periodic measures, the absolute and relative rate of growth, the measures of height and caulinar diameter of the plants and volume of the plants in time intervals (for example 15 days) during the plants life.