Dry Matter Yield—N and S Concentration Relationships and Ratios in Young Corn Plants1

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Abstract
Dry matter‐N and S concentration relationships and N/S ratios were studied in corn (Zea mays L.) grown in several greenhouse pot experiments on soil deficient in both N and S for good growth. Such relationships and ratios are basic to the proper interpretation of plant analysis results. Minimum concentrations in the dry forage necessary for continued growth of corn at 6 to 8 weeks were about 0.70% N and 0.045% S. Total N/S ratios varied widely from this ratio of 16, depending on age of plant, excess of N or S necessary for growth, and as a result of dilution of one nutrient by growth response to the other. This value of 16 at the minimum N and S concentrations approximates the ratio in plant proteins. Variations from the ratio of 16 indicate varying amounts of labile, nonprotein N or S.

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