EFFECT OF CONTINUOUS SOIL AMENDMENT WITH CONIFEROUS SAWDUST ON NEMATODES AND MICROORGANISMS
Sandy soil was amended for six consecutive years with coniferous sawdust at the rate of 8 metric tones ha[sup-]¹. The treatment resulted in a considerable increase in the population of fungi, including Trichoderma spp., while there was no apparent effect on bacteria. This was associated with an increase in the density of microbivorous nematodes. Among bacterial feeders cephalobids increased more than rhabditis. Among fungal feeders succession was observed where Aphelenchoides spp. increased after the first treatment and decreased later; this was followed by Ditylenchus spp., and later by Filenchus spp. The treatment also improved soil density and capillary binding of water, and is considered beneficial for soil biotic and abiotic conditions.