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PJB-2001-78

EFFECT OF SOIL MOISTURE AND TEMPERATURE ON THE POPULATION OF VERTICILLIUM CHLAMYDOSPORIUM GODDARD

ASMA NOREEN, AMER-ZAREEN & M.J. ZAKI

Abstract

Population of fertculm chlamydosporm was examined at different soil moisture and lemperature regimes. A. significant (pc0.00l) reduction in population of l chlamydospornan was ahserved at 0 & 100% MIC after 4 weeks. Whereas 50 & 75% moisture enhanced the germination of chlamydosporium and an increase in population of f: chlamydosporium was observed. A. moderale eflect on survival of chlamydospores was observed at 25% MHC. In another experiment effect of soil temperature on population of chlamydosporium in moist and dry soil was observed. Population of fungal chlamydospores was declined at 30. 40 & 50°C in wet and dry soils. A moderate temperature (20°C) signilicantly (pc0.001) increased the fungal population in wet soil whereas fungal survival decreased slightly at 10°C in both wet and dry soils

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