Abstract

ABSTRACTEthylene concentrations in the soil atmosphere can greatly exceed levels known to markedly influence plant growth. The ethylene is microbial in origin and the rate of production under anaerobic conditions is correlated with organic matter content. Under field conditions the highest concentrations occur when soil temperatures and moisture levels are high, resulting in development of anaerobic zones.Crop species differ widely in the sensitivity of their roots to ethylene, this sensitivity being broadly correlated with known intolerance of waterlogged (anaerobic) environments.

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