Abstract
In an incubation experiment the development dynamics of bacterial and fungal communities as well as the level of phytotoxicity were analysed in sand and three soils differing in mechanical structure and amended with corn residues and mineral nitrogen. Bacterial biomass was positively correlated with the degree of dispersion of the solid phase of the soil, whereas the ratio of fungal to bacterial biomass (F:B) was found to be negatively correlated. Fungi were much more tolerant to carbon or nitrogen deficit than bacteria. Introduction of the plant material alone, characterized by a broad carbon to nitrogen ratio, led to the domination of fungi in microbial communities. The level of soil phytotoxicity built up with increasing level of crop residues. Phytotoxicity was observed for the longest time period in soil with the highest silt and clay content. The narrowing of the C:N ratio at introduction of the appropriate amount of mineral nitrogen (larger in heavier soils) resulted in accelerated disappearance of phytotoxicity and at the same time favoured bacterial development. This points to a significant participation of bacteria in the degradation of phytotoxic substances in the soil.
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References
Bhowmik P C and Doll J D 1984 Allelopathic effects of annual weed residues on growth and nutrient uptake of corn and soybeans. Agron. J. 76, 383–388.
Guenzi W D, McCalla T M and Norstadt F A 1967 Presence and persistance of phytotoxic substances in wheat, oat, corn and sorghum residues. Agron. J. 59, 163–165.
Kaczmarek W, Kaszubiak H and Guzek H 1973 Comparison of changes in the number of microorganisms in the soil by the plate and microscopic procedure. Polish J. Soil Sci. 6, 133–139.
Kaczmarek W 1984 A comparison of bacterial and fungal biomass in several cultivated soils. Acta Microbiol. Polon. 3/4, 239–247.
Kaczmarek W, Wójcik-Wójtkowiak D and Pudelski T 1984 The dynamics of microflora development and phytotoxic substances formation in greenhouse substrates repeatedly used in cucumber growing. Acta Hortic. 156, 95–103.
Kanazawa S and Yoneyama T 1980 Microbial degradation of 15N-labeled rice residues in soil during two years' incubation under flooded and upland conditions. Soil Sci. Plant Nutr. 26, 229–239.
Lovett J V and Jessop R S 1982 Effects of residues of crop plants on germination and early growth of wheat. Aust. J. Agric. Res. 33, 909–916.
Mason-Sedun W, Jessop R S and Lovett J V 1986 Differential phytotoxicity among species and cultivars of the genus Brassica to wheat. Plant and Soil 93, 3–16.
Mersie W and Singh M 1987 Allelopathic effect of parthenium (Parthenium hysterophorus L.) extract and residue on some agronomic crops and weeds. J. Chem. Ecol. 13, 1739–1747.
Patrick Z A 1971 Phytotoxic substances associated with the decomposition in soil of plant residues. Soil Sci. 111, 13–18.
Paustian K and Schnürer J 1987 Fungal growth response to carbon and nitrogen limitation: a theoretical model. Soil. Biol. Biochem. 5, 613–620.
Wójcik-Wojtkowiak D, Politycka B, Schneider M and Perkowski J 1990 The phenolic substances as allelopathic agents arising during the degradation of rye (Secale cereale) tissues. Plant and Soil 124, 143–147.
Yakle G A and Cruse R M 1983 Corn plant residue age and placement effects upon early corn growth. Can. J. Plant Sci. 63, 871–877.
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Weyman-Kaczmarkowa, W., Wójcik-Wojtkowiak, D. The dynamics of microflora and the occurrence of phytotoxic substances in different soils with corn residues and inorganic nitrogen. Plant Soil 132, 11–20 (1991). https://doi.org/10.1007/BF00011007
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DOI: https://doi.org/10.1007/BF00011007