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Strategies for the Biological Control of Root Diseases in Hydroponically Grown Vegetables 1997

Project Leader: Eric B. Nelson


1. Assess temporal changes in microbial populations in the rhizosphere of hydroponically grown spinach and lettuce plants.

2. Evaluate microbial inoculants and compost extracts for the suppression of Pythium root diseases in hydroponics.


Shoot biomass accumulation in lettuce plants grown in the pond with freshly disinfected nutrient solution was significantly greater after 35 days than that in lettuce plants grown in the other two ponds. There was no significant difference between ponds containing uncleaned nutrient solution and those amended with compost. These results indicate that the method of introducing potentially disease-suppressive microbes from compost was ineffective in inducing suppressiveness in pond hydroponic systems.