THE MICROBIOLOGICAL PROPERTIES OF SUBSTRATES WITH SEWAGE SLUDGE COMPOSTS IN FRENCH MARIGOLD (TAGETES PATULA L.) CULTIVATION

摘要

The aim of the study was to determine the total number of eubacteria, moulds and actinobacteria and to determine dehydrogenases, acid phosphatase and urease activity in peat substrates with different composts under French marigold (Tagetes patula L.) 4Boy Golden’ cultivation. Apart from that, the aim of the study was to determine the influence of composts on the morphological traits of French marigold. Plants were placed in peat substrates with admixtures of composts produced from sewage sludge, wheat, maize and lupine straws. Samples of the substrate were collected at three terms: at the stages of plantation, vegetative growth and florescence. Then the samples were analysed microbiologically and biochemically. The results of the investigations gave an outline of variations in the population of basic groups of microorganisms and enzyme activity during the plants’ growth, depending on the experimental combination applied. The research revealed that different doses of the aforementioned composts added to peat stimulated the growth of eubacteria and moulds the most, whereas they stimulated the growth of actinobacteria to a lesser extent. The research also revealed that the metabolic activity of microorganisms in peat combinations with different doses of composts was greater than in peat by itself (the control sample). Apart from the compost with the admixture of lupine straw, all the composts can be used for growing French marigolds, but first they need to be mixed with peat. This research seems to solve both the problem of excessive amounts of sludge that has been produced and that is being produced. The research also showed the possibility to use sewage sludge composts for the production of garden substrates.