INFLUENCE OF BIOLOGICALLY-ACTIVE AGENTS A PPLICATION ON CHANGE OF BETAINE CONTENT IN LEAVES AND ROOTS OF SUGAR-BEET

Influence on betaine content in leaves and roots of selected sugar bee t varieties, of various application of biologically active agents duri ng the years with various climatic conditions, 1993 and 1994, was inve stigated in the small plot trials in Uhrineves. The agents were growth stimulators Rastim, Atonik, synthetic cytokinin and bioalginate. The average betaine content in dry substance of leaves in the tested varia nts was in 1993 3,44% and in 1994 5,73%. The roots contained in 1993 2 ,18% and in 1994 1,77% betaine in dry substance in average of all the variants. The differences of Letaine content among the varieties were higher than among the different amounts of agents applied and mostly w ere statistically little conclusive. The relatively lowest betaine con tent was found in the leaves and roots in both years in the variety Ib is and the highest in the leaves of the variety Edda and roots of vari ety Petra. In 1993 the most decrease of betaine in the leaves and root s appeared after the application of Atonik and in 1994 the most increa se in the leaves and roots was found after the spring application of c ytokinin. In 1993 the negative correlation was proved of the yield of foliage and roots on the betaine level in leaves and roots. The antici pation was confirmed that betaine content may be a suitable additional indicator of ecological influence on sugar beet yield and quality.