The pigment complex and productivity of winter barley depending on the forerunner plant and effect of the growth regulator AKM | Pigmentnyj kompleks i produktivnost' rastenij yachmenya ozimogo v zavisimosti ot predshestvennika i dejstviya regulyatora rosta AKM

This paper presents the field experiments (2009 - 2011)studying the effect of seeds and vegetative plants treatment with the growth regulator AKM on the pigment complex and productivity of winter barley plants (Dostoynyi Variety)cultivated after different forerunner plants: 1) naked fallow (the best), and 2)sunflower(bad). In order to assess the response of the pigment complex to the action of growth regulator and forerunner plant the chlorophyll and carotenoid content in the leaves of barley was determined in the phase of tillering, booting and heading stage. Concomitantly, it was determined the leaf area and net photosynthetic productivity (NPP). The obtained results suggest an anti-stress effect of the AKM preparation on the photosynthetic activity of winter barley plants, which is reflected in the efficiency of its effect on crop yield. The application of growth regulator increased the productivity by 13% (naked fallow) and by 26% (sunflower). AKM has a significant effect on the accumulation of chlorophylls a, b and carotenoids in the leaves, but the change in their shares and productivity is determined by the character of the forerunner plant. In general, the increase of the pigment fund, its functional activity and leaf area under the influence of growth regulator also intensifies the production process, fact proved by an increase in the net photosynthetic productivity of agrocenosis after a good forerunner plant (naked fallow) of 14-32%, and a poor forerunner plant (sunflower) - by 35-46% compared with the corresponding control variants. The growth regulator had a contribution of 13.5% on the NPP, the forerunner plant(factor B) - 80.3% and the interaction of factors - 4.4%.