The development of actinomycetes and fungistatic activity of soils as affected by pH and soil type

摘要

A study was made of the effect of liming on the total number of actinomycetes (A) and the number of their fungistatic forms (fA) as well as on the level of fungistatic activity (FAS) of two soils: loamy sand (ls) and a loose sandy soil (lss), storedfor 90 days in laboratory conditions. Liming caused an increase in the numbers of A and fA, especially in lss in which the raising of pH from 4.5 to 9.0 brought about a 7-fold increase in A and 5-fold increase in fA. In both limed soils the percentage of fA in A communities decreased. At native pH, the level of fungistasis was higher in ls than in lss. Liming intensified fungistasis only in the lighter soil. Its level as expressed by a coefficient of fungistatic activity (C-FAS) increased 7-fold when lss was limed to a pH of 9.0.