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Tillage, Cover Crop, and Kill-Planting Date Effects on Corn Yield and Soil Nitrogen

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

View larger version (23K): [in a new window]   Fig. 1. Monthly total rainfall from April to August in 1998 and 1999 and the 41-yr average. The number inside the parenthesis indicates total rainfall from April to August. The hatch () indicates time of irrigation application for silage corn. Irrigation equivalent to 25 mm rain at a time was applied using a reel rain gun.

View larger version (15K): [in a new window]   Fig. 2. Effect of tillage on biomass yield of hairy vetch and winter weeds. NT, no till; CP, chisel plowing; and MP, moldboard plowing. Bars with the same letter at the top are not significantly different by the least square means test (P 0.05).

View larger version (28K): [in a new window]   Fig. 3. Effects of cover crop kill–corn planting date (early and late) and cover crop species on (A and B) silage corn yield and (C and D) N uptake in 1998 and 1999. The cover crop kill and corn planting dates are shown in Table 1. Within a year, bars with the same letter at the top are not significantly different by the least square means test (P 0.05).

View larger version (22K): [in a new window]   Fig. 4. Effects of cover crop kill–corn planting date (early and late) and tillage on (A) silage corn yield and (B) N uptake. NT, no till; CP, chisel plowing; and MP, moldboard plowing. The cover crop kill and corn planting dates are shown in Table 1. Bars with the same letter at the top are not significantly different by the least square means test (P 0.05).

View larger version (20K): [in a new window]   Fig. 5. Effects of cover crop kill–corn planting date (early and late) and tillage on soil inorganic N concentration in (A) 1998 and (B) 1999. NT, no till; CP, chisel plowing; and MP, moldboard plowing. The cover crop kill and corn planting dates are shown in Table 1. Within a year, bars with the same letter at the top are not significantly different by the least square means test (P 0.05).

View larger version (18K): [in a new window]   Fig. 6. Effects of tillage and cover crop on soil inorganic N concentration. NT, no till; CP, chisel plowing; and MP, moldboard plowing. Bars with the same letter at the top are not significantly different by the least square means test (P 0.05).