Wolna-Maruwka et al.: The influence of organic fertiliser prototypes with the Trichoderma on the sanitary and enzymatic conditions of soil and the yield of spinach (Spinacia oleracea L.) -2807 -APPLIED ECOLOGY AND ENVIRONMENTAL RESEARCH 18(2):2807-2821. Abstract. A two-year study was conducted to find how mineral and organic fertilisation and Trichoderma sp. strains influenced the total count of molds, including Fusarium, Alternaria and Trichoderma genera, the biological index of fertility

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... and the yield of spinach (Spinacia oleracea L.). Eleven variants were used in a field experiment conducted on lessivѐ soil: a control sample, mineral fertilisation, organic fertilisation with manure and eight variants with tomato or onion waste composts. Some of them were inoculated with Trichoderma atroviride (T1) and/or T. harzianum (T2 and T3) isolates. The addition of manure resulted in the greatest increase in the total count of moulds in the soil. The highest BIF value was noted in the soil enriched with tomato compost and inoculated with both T1 and T2 strains. The count of Fusarium sp. was reduced the most in the soil fertilised with onion compost with the addition of T1 and T3 isolates. The greatest decrease in the count of Alternaria sp. was observed in the soil fertilised with compost inoculated with the T1 strain. The onion compost inoculated with Trichoderma T1 and T3 resulted in the highest yield of spinach, which was comparable to the one obtained after mineral fertilisation.