Flue Gas Desulfurization Products as Sulfur Sources for Corn
- Liming Chen,
- David Kost and
- Warren A. Dick *
Nitrogen deficiency in the soil often limits corn (Zea mays L.) production. Recently, S deficiency in several crops, including corn, has been observed. Little information is available, however, related to the interactive effects of N and S fertilization on corn growth and yield using modern corn hybrids. Field experiments were conducted from 2002 to 2005 to test corn response to seven rates (0–233 kg ha−1) of N and two rates (0 and 33 kg ha−1) of S applied to a silt loam soil at Wooster, OH. The S was applied as flue gas desulfurization (FGD) products and was primarily in the form of gypsum. Corn grain yields were significantly (P ≤ 0.05) increased by N fertilizer addition from 2003 to 2005. Sulfur addition also significantly increased the average yield of corn in 2002 and 2003. An N × S interaction for corn yield was observed in 2005. Sulfur application at 33 kg ha−1 significantly (P ≤ 0.05) increased corn yield at the intermediate N rate of 133 kg ha−1, and showed a general tendency to increase yield at lower N rates in 2004 and 2005. Nitrogen and S concentrations in corn grain were increased by application of 200 kg N ha−1, and S concentration was increased by S application in 2005. These results suggest that application of S fertilizer, with N, can promote the uptake of N by corn in S-responsive soils. This will decrease the amount of N required for high-yield corn production and reduce production costs and degradation of water quality associated with oversupply of N.Please view the pdf by using the Full Text (PDF) link under 'View' to the left.
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