Contributions to the mobilization of phosphorus by soil microorganisms. 2nd communication. Influence of thermal sterilization, microbial colonization, and growth of young wheat plants on phosphorus content of soil and plants

In a model experiment, comprising six treatments (non-sterilized soil with and without young wheat plants: sterilized soil without plants plus or minus inoculated fungi: sterilized soil with plants plus or minus fungi), ten fungi were tested in respect of their influence on the activity of acid phosphatase and phosphorous mobilization in soil and P content of the plants. When the data were arranged with regard to sterilization, inoculation, and growth of plants, the soil parameters showed, caused by sterilization, a stimulating effect on phosphatase activity and phosphorus content in the water extract and the sodium bicarbonate extract, but no such effect was evident in the calcium lactate extract. On an average, all tested inoculated fungi showed decreasing pH values, increasing phosphatase activity and only little changes in the yields of soil phosphorus content. The wheat plants increased phosphatase activity, decreased, however, the other parameters investigated. The phosphorus uptake by the plants was increased by inoculation.