Influence of moisture conservation techniques on Macrophomina phaseolina population, dry root rot and yield of clusterbean
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Authors
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SATISH LODHA
Plant Pathology Laboratory, Central Arid Zone Research Institute, Jodhpur 342 003
Keywords:
Clusterbean, farmyard manure, Macrophomina phaseolina, mulchingAbstract
The effect of varying levels of soil moisture on M. phaseolina populations and dry root rot intensity in cluster bean (Cyamopsis tetragonoloba) [guar] was studied under arid conditions at Jodhpur, India. Mulching with a layer of pearl millet stover(3.5 ton/ha), farmyard manure (10 ton/ha) and low plant population (1.6 lakh/ha), alone or in combination, effectively conserved available soil moisture of varying levels during different stages of crop growth. This resulted in increased population of resident bacteria with a corresponding decrease in sclerotial counts of M. phaseolina. Correlations of soil moisture with total bacteria were positive but these factors were negatively correlated with M. phaseolina. In path coefficient analysis, the highest negative indirect effects of soil moisture modified the behaviour of antagonistic microorganisms. Enhanced soil moisture and a decrease in M. phaseolina population significantly reduced the dry root rot intensity and increased seed yield of guar.
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