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Abstract
In the paper, Growth and Tissue Composition of Sweet Corn as Affected by Nitrogen Source, Nitrapyrin, and Season by B.D. Rudert and S J. Locascio (J. Amer. Soc. Hort. Sci. 104(4):520-523. 1979), there is an error in Table 2. The last 4 columns of data for Spring 1977 should be moved over 1 column to the right. The dry weights column for Spring 1977 should be blank.
Abstract
Sweet corn (Zea mays L.) was grown to evaluate the effect of N source, N rate, time of N application, and the nitrification inhibitor, 2-chloro-6-(trichloromethyl) pyridine (nitrapyrin), on crop efficiency and movement of applied N on a Kanapaha fine sand. Sweet corn yield was not affected by nitrapyrin rates of 0, 0.56, and 1.12 kg/ha, during 2 seasons. During a wet 1976 summer season, total yield was 65% higher with N applied as (NH4)2 SO4 than as Ca(NO3)2. Total yield increased linearly from 6. 1 to 9.8 MT/ha with an increase in N rate from 56 to 224 kg/ha as (NH4)SO4. With Ca(NO3)2, total yield averaged 4.9 MT/ha and was not influenced by N rate. During the drier 1977 spring season, marketable yield was not influenced by N source. Total yield increased linearly from 9.1 to 14.6 MT/ha with an increase in N rate. In the wetter season, the application of N in split rather than single applications as Ca(NO3)2 increased yield. During the dry season, timing of N application had no effect on yield with either N source. The suppressing action of NH4-N absorption on the absorption of other cations was evident but was not consistent throughout the study. The application of (NH4)2SO4 as compared to Ca(NO3)2 resulted in higher plant dry weights at an early sampling stage in the wet season but not during the dry season. Higher soil N (NH4-N + NO3-N) levels were maintained above a 20-cm soil depth with (NH4)2SO4 than with Ca(NO3)2 during the wet season.