THE EFFECT OF THE EXPLOITED SUBSTRATUM AF TER PLEUROTUS-OSTREATUS GROWING ON THE QUALITY OF SUGAR-BEET

In this paper the possibilities of utilization of exploited substratum after Pleurotus ostreatus growing in sugar beet growing focusing on t he quality of sugar beet, are discussed. The field trials were carried out on heavy soil of neutral pH with a good supply of accessible nutr ients. The following variants were carried out: A - manure in dosage o f 15 t.ha-1; B - manure in dosage of 15 t.ha-1 + exploited substratum in dosage of 15 t.ha-1; C - exploited substratum in dosage of 15 t.ha- 1; D - exploited substratum in dosage of 15 t.ha-1 + 5% of plannedNPK calculated according to the soil analyses; E - 100% of planned NPK cal culated according to the soil analyses; K - control variant without ma nuring. Analyses of sugar beet roots and calculations of qualitative f actors were done according to the methods used in sugar mill analyses (Schmidt, Bernardova 1973). Microbiological activity of soil and inten sity of cellulose decomposition were studied as well. The exploited su bstratum applications had an inhibiting effect on growth process of su gar beet compared to the application of manure. However, both variants , manure application and application of the exploited substratum showe d a significant yield increase in comparison with the control variant. The highest yields were achieved on the variant where manure was comb ined with an exploited substratum. The effect of the exploited substra tum application on the qualitative factors of sugar beet was positive. The most influenced was the content of water-soluble ashes and sugar content while effect on these characteristics was different (Tab. I) a nd had an impact on other technological characteristics of sugar beet (Tab. II). The positive effect of the application of exploited substra tum improved health condition of sugar beet.