VARIABILITY OF THE STRENGTH PROPERTIES OF WINTER RAPE STEMS AS AN EFFECT OF CONTROLLED STRATEGY IN PLANT GROWTH CONDITIONS

摘要

The study determines the strength properties of winter rape stems of Jupiter variety, originating from plots of different sowing density values (20,40,60, 80 plants per m~2) on which a somewhat increased dosage of nitrogen fertilization - N=120 kg/ha - was applied. The strength properties were interpreted by means of mechanical parameters determined in the static test, in the process of bending (rigidity, maximum bending stress), and in the dynamic test, in the process of shearing (dynamic shearing energy). The study showed that, as a result of controlled strategy of rape cultivation, an enormous differentiation of rape stems was obtained, both from the viewpoint of their morphology and their strength properties.