SOIL MICRO-POPULATION STUDIES IN CONTINUOUS FIELD EXPERIMENT WITH EXCLUSIVE FARM-YARD MANURING OR EXCLUSIVE MINERAL FERTILIZATION

Plantations of industrial crops are more and more frequently mass-attacked by soil pathogens such as Fusarium oxysporum. Thielaviopsis basicola, Phytium de Baryanum, Rhizoctonia sp., Especially difficult is the fight against soil-born Fusarium of plants.
The working-out of proper manuring systems and proper crop sequences in crop-rotation can in a considerable degree protect the plantations against infection by phytopathogens.
Research-work must be based on investigations of micropopulations in soil.

Especially convenient conditions for such investigations are created by stationary experiments of many years, standing.

Research work on determination of fungi groups under various ecological conditions has been carried out for many years at the School of Agriculture in Grignon (France). Data obtained in those investigations by Montegut and Guillemat [7, 8, 14] showed that specific changes in the groups of fungi were influenced by various ecological factors.
The main factors are: soil type, pH, moisture, temperature and organic matter content.

It was stated by a number of investigators that as humus content in soil grew, the quantity of rot-root fungi diminished.
The explanation given by Schönhar [18] is that in soils with higher humus content fungi antagonists of rot-root fungi are more numerous.

Symposium on Nutrition and Fertilization of Vegetables

Z. Maciejewska, L. Dutkiewicz

https://doi.org/10.17660/ActaHortic.1973.29.17