Abstract
An experiment was conducted to study the effect of salinity and water-potential distribution on maize root growth and development. Three salinity distributions and two ranges of soil water potential treatments were prepared by filling 140 cylindrical PVC containers 1.2 m long and 0.25 m in diameter with loamy sand. Root and shoot samples were taken at different growth stages. Saturated electrical conductivity and water content were measured periodically. The results indicated that root and shoot dry-matter accumulation varied significantly among different salinity and water distribution treatments. Root dry-weights continued to increase until flowering stage and then remained constant. No root growth was observed in layers with electrical conductivity > 12 dS/m. For maize root growth under the conditions of this study a salinity level of 12.0 dS/m seemed to be a barrier even under high levels of soil water.
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