Effects of excess soil water on sweet corn yield
1990
Carter, C.E. | Halverson, B. | Rogers, J.S. | Musgrave, M.
An experiment was conducted on silt loam alluvial soil in Louisiana to determine the yield response of sweet corn to excess soil water stress and to determine crop susceptibility factors during vegetative and tasseling/silking stages of growth. Sweet corn yield from 40 m2 plots that received excess soil water stress treatments (high water table within 30 cm of the soil surface) of three, six-, and nine-days duration during vegetative and tasseling/silking stages was usually significantly less than yield from the control (drained/irrigated) treatment. Average yield among treatments was lowest from the nine-days stress duration. Yields of sweet corn stressed for nine days during the vegetative and tasseling/silking stages were 77 and 61% less, respectively, than those from the drained/irrigated treatment. Normalized crop susceptibility factors, based on weight of marketable corn, were 0.55 and 0.45 for the vegetative and tasseling/silking stages, respectively. These factors indicate that sweet corn is highly susceptible to excess soil water stress during both stages of growth but usually more so during the vegetative stage. Correlating the relative corn yield (marketable weight) with Stress Day Index values indicated that relative corn yield decreased 0.62% for each one-unit increase in the Stress Day Index. Fifty-four percent of the variation in relative sweet corn yields was explained by Stress Day Index.
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