Possibility of an estimation of stability to a dry wind of the zoned and new grades, and also lines of a cotton in the conditions of the artificial dry wind created in the Uzbek scientific research institute of selection and seed-growing of a cotton by means of special adaptations is shown. On the basis of the received results for the first time are revealed steady (on number of boxes on a plant, weight of one box, productivity of one plant) to an artificial dry wind of a grade and a cotton line.