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Influence of Winter Cover Crop and Residue Management on Soil Nitrogen Availability and Corn

Washington State Univ., Puyallup Res. and Ext. Cent., 7612 Pioneer Way East, Puyallup, WA 98371-4998

View larger version (18K): [in a new window]   Fig. 1. The relationship between total available N in the soil (Nt) early in the growing season and corn yields.

View larger version (19K): [in a new window]   Fig. 2. The relationship between total available N in the soil (Nt) early in the growing season and N uptake.

View larger version (22K): [in a new window]   Fig. 3. The relationship between the total available N in the soil (Nt) early in the growing season and relative yield of corn.

View larger version (16K): [in a new window]   Fig. 4. The effect of presidedress NO3-N on the corn yield response to the total available N (Nt) at a half of the Nt needed for maximum corn yield.

View larger version (14K): [in a new window]   Fig. 5. Organic C and N of the soil as affected by C input from cover crops.