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Soil Organic Matter and Tomato Yield following Tillage, Cover Cropping, and Nitrogen Fertilization

Agric. Res. Stn., Fort Valley State Univ., 1005 State University Drive, Fort Valley, GA 31030

View larger version (45K): [in a new window]   Fig. 1. (A) Average monthly temperature and (B) total monthly rainfall from January 1995 to December 1997, and the 41-yr average near the experimental site in Fort Valley, GA, USA.

View larger version (37K): [in a new window]   Fig. 2. Soil potential C mineralization (PCM), averaged across cover crops and N fertilization rates, as affected by tillage and date of sampling at 0- to 7.5- and 7.5- to 20.0-cm depths from September 1995 to August 1997. NT, no-till; CP, chisel plowing; MP, moldboard plowing. The vertical bar is the least significant difference (LSD; P = 0.05) for measuring significant difference between treatments.

View larger version (39K): [in a new window]   Fig. 3. Soil potential N mineralization (PNM) as affected by tillage, cover crop, N fertilization rate, and date of sampling at 0- to 7.5- and 7.5- to 20.0-cm depths from September 1995 to August 1997. NT, no-till; CP, chisel plowing; MP, moldboard plowing. Values of a treatment (i.e., tillage) were averaged across two other treatments (i.e., cover crop and N fertilization rate). The vertical bar is the least significant difference (LSD; P = 0.05) for measuring significant difference between treatments.

View larger version (38K): [in a new window]   Fig. 4. Soil inorganic N concentration as affected by tillage, cover crop, N fertilization rate, and date of sampling at 0- to 7.5- and 7.5- to 20.0-cm depths from September 1995 to August 1997. NT, no-till; CP, chisel plowing; MP, moldboard plowing. Values of a treatment (i.e., tillage) were averaged across two other treatments (i.e., cover crop and N fertilization rate). The vertical bar is the least significant difference (LSD; P = 0.05) for measuring significant difference between treatments.