Application of the Chow method for evaluation of morphometric parameters of the sunflower root system

When growing sunflower, great importance is provided to the issue of accumulation and preservation moisture in deep soil horizons, which turn affects productivity crops. In arid regions, providing plants with particular importance. The technologies conservation agriculture relation sunflower cultivation allow varying depth autumn tillage from 17 33 cm, which, combination metered use mineral fertilizers considering difference consumption for season a meter layer soil, provide an increase yield compared traditional main tillage. Moreover, ratio income sale seeds grown steppe production costs depends on strip processing dose fertilization. Wherein, zones commercial production, high increases are by application nitrogen-phosphorus fertilizers, contribute intensive formation underground vegetative organs, has unlimited growth length positive geotropism. article presents results multivariate regression analysis study morphobiological features root system using Strip-Till technology experimental field Povolzhye Educational Scientific Production Association Saratov State Agrarian University named after N.I. Vavilov. morphometric assessment indicate better development treated strips types basic To determine limits applicability piecewise linear model develop practical recommendations implementation resource-saving potential dry zone South-East Russia used reliable sensitive criterion based method J. Chow.