Abstract
Phosphorus was either banded, broadcast, or incorporated into raised beds at 33, 66, 99, or 132 kg·ha-1. Sweet corn was planted in two rows 30 cm apart on the beds. Substantial differences in plant growth were observed between the two rows on each bed. Yield response to P treatments was masked by this variability. Plant tissue samples were collected at mid-season and at harvest time, and were analyzed for P, K, Ca, Mg, Zn, and Fe. Strong positive correlations were found between corn yield and plant Fe content, and strong negative correlations were found between corn yield and plant Zn content. Phosphorus content of tissue was positively correlated with plant Fe and negatively correlated with plant Zn content. Differences in plant height measured at mid-season could not be explained by nutrient concentrations in the tissue at that time. Corn ear yield was best explained by Fe concentration of the shuck (positive correlation), and by zinc concentration of the foliage (negative correlation) at harvest time. The range in ear weight was greater with the banded P treatments than with broadcast or incorporated P.
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