Zbiorowiska grzybów środowiska glebowego z uprawy ziemniaka i ich wpływ na sprawców suchej zgnilizny bulw w zależności od nawożenia azotowego
AbstractThe aim of the study carried out in 1987-1989 was to determine the effect of fungal communities of soil environment on the intensity of occurrence of po¬tato dry rot and its causal agents as depending on nitrogen fertilization. This aim was accomplished by - investigating the species composition of the fungal communities occurring in the soil environment fertilized by different doses of nitrogen (50, 100, 150 and 200 kg/ha), — estimating the effect of nitrogen fertilization in the period of storage on the occurence of dry rot of potato tubers, and determining the species composition of its fungal agents, and — characterizing the biotic interaction between the fungi from the soil outsi- de the rhizosphere and from the potato rhizosphere and the major agents of dry rot, i. e. Fusariurn sulphureum Schl. and F. coeruleum (Sacc.) Booth, The investigation showed that the qualitative and quantitative composi¬tion of the communities of fungi distinctly depended upon the development stage of plants, doses of nitrogen fertilization and atmospheric conditions. Higher doses of nitrogen fertilization (150 and 200 kg/ha) favoured the occurrence a ttiber tom.. 'r c4inkiliticins of the experiment its chief agents were fungi of the genus Fusarium: F. sulphureurn and F. coerithrrint other genera Acremonium roseum and Phoma exigua v. exigua. Fungi from the soil outside the rhizosphere and from the potato rhizosphere grown at different doses ofi nitrogelix fertilization limited the growth of Fusarium coeruleurn. This pathogen was found a poor partner in the competition with saprophitic fungi, as shown by the fairly high positive total biotic effects. The investigation on the biotic relations showed that the communities of fungi associated with the analysed plough-land environment beneficially of fected the growth of the pathogen Fusarium sulphureurn. This biotic effect, unfavourable from the point or view of the course of the disease, was obser¬ved both in period of plant emergence and in full maturity of potato. The species of fungi characterized by the most active antagonistic effect on the two pathogens are (in the diminishing order): Trichoderma viride, T polysporum, T. hamatum, T. koningii, T. harzianurn, Mucor circinelloides f, circinelloides, M. hiernalis f. hiernalis Fusariurn culniorum, F. sambucinuni, Rhizoctonia solani, Epicoccurn purpurascens, and Boilytis cinerea. The mycological investigation of fungal communities in ploug-land environments of potato may help in the elucidation of the mechanism of agrote¬chnical measures affecting the h itt:rif this crop.
|Other language title versions||Fungal communities of the soil environment from potato rhizosphere and their effect on agents of dry rot of tubers depending on nitrogen fertilization|
|Publisher||Uniwersytet Rolniczy im. Hugona Kołłątaja w Krakowie, MNiSW |
|Publishing place (Publisher address)||Kraków|
|Book series /Journal (in case of Journal special issue)||Zeszyty Naukowe Akademii Rolniczej im. H. Kołłątaja w Krakowie. Rozprawy, ISSN 1233-4189, (0 pkt)|
|Publication size in sheets||6|
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