Abstract
AbstractOrganic nitrogen and sugar levels in the second internode pith tissue of three corn (Zea mays L.) lines, with three fertilizer treatments, were determined over a period of 9 weeks, beginning shortly before silking. Nitrogen levels were highest at 11 weeks after planting, or about silking time, and then declined. Total and reducing sugars in the pith tissue increased up to 13 to 15 weeks and then declined. The application of 168 kg/ha (150 lb/acre) of potassium as KCl significantly increased organic nitrogen levels in two of the three lines under study. Reducing sugars were sharply decreased in all corn lines by the KCl treatment. The application of 157 kg/ha (140 lb/acre) of chloride ion as NH4Cl (without K+) significantly decreased reducing sugar levels in one corn line and, in general, had effects similar to, but smaller than, the KCl treatment.
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