In order to evaluate the Physical properties Of the Hybrid leaf of 4 of fayer tobacco for pu re in the phase of the drying under tropical conditions and to Evaluate the yield of dry matter and to detennine the cost benefit of the treatments in study, it was carried out the present work in the cured of house of Tobaccos of the Peru S. A. in Juan Guena district, County and department of San Martín, altitude 232 m. s. n. m., Longitude West 76º 30 (15", South Latitude 06º 30 (15", Tº mediatas Annual 26.3ºC and precipitation 1047 mm. lt was driven Completely under the Design ·Block. Randomized with 4 treatments and 4 repetitions. The treatment 1 that corresponds to the hybrid tobacco ª59107 x 59105", it was the one that presentad a better characteristic to be used for the layer of pure, when showing in the leaves 9.11 elasticity, 8.44 flat, 75% combustibility, 18.22% humidity, 9.8 of a...