Monday, 7 November 2005
9

Corn Yields in Sod Based Cropping Systems.

Tawainga W. Katsvairo, David L. Wright, Jim J. Marois, and Pawel J. Wiatrak. North Florida Research and Education Center, 155 Research Road, Quincy, FL 32351

The Southeastern United States (SE) does not produce enough corn (Zea mays) to meet its grain and silage needs and relies on imports. The corn production deficit is due to multiple factors including pest problems, erratic rainfall, poor soil fertility and fluctuating or low prices for commodities. We evaluated yield, plant growth characteristics and soil physical properties in corn following bahiagrass (Paspalum notatum) compared to continuous corn. It was hypothesized that after 2 years of sod the benefits of the perennial grass to the soil would enhance yield as is often realized with cotton and peanuts. The experiment was conducted at the North Florida Research and Education Center in Quincy, FL, in 2003 and 2004. Temperate corn silage yields averaged 56 and 58 Mg/ha in 2003 and 2004 respectively. Grain yields averaged 12490 kg/ha and 6277 kg/ha in 2003 and 2004, respectively and were not affected by bahiagrass in both years. Silage yields for tropical corn showed a response to bahiagrass in 2003 but not in 2004. Generally there was a tendency for lower yields immediately after bahiagrass due to the higher N requirement needed to decompose the bahiagrass residue. Chlorophyll and plant height did not differ between the two cropping systems.

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