Present labor is I realized between October of 1999 until February of the 2000, in the district of Buenos Aires, Province of Picota - Region San Martín, placed to OS° 48' 15" south latitude, 76°06'S8" west length and to an altitude of 223 meters on level of the sea. It is labor with 8 hybrid that they are: NK-STAR, C-606, C-425, DK-821, AG-612, AG5572, G-5423 and PIMTE-INIA (witness). It is appraisement the efficiency and other complementary vegetative characteristics, employing the statistic design of full block at random with 8 treatrnents and 4 repetitions, whose results were analyzed through the variance analysis, the proof of Duncan and the linear regression analysis to the 1 and 5% of probability. Experimental soil was clayey franc texture, of slightly alkaline reaction (potential Hydrogen : 7,79), with organizational matter content, middle, ( 2,75 ), middle phosphorus content (...