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Tillage and Compost Effects on Corn Growth, Nutrient Accumulation, and Grain Yield

USDA-ARS, National Soil Tilth Lab., Ames, IA 50011

View larger version (20K): [in this window] [in a new window]   Fig. 1. Shoot DM and N uptake in MP, CT, and NT at different measurement dates after corn planting in compost amended and nonamended soil in 2003 and 2004 near Ames, IA. Capital T and A indicate statistical significance for tillage and amendment treatments and interactions (T x A) at P values < 0.1.

View larger version (19K): [in this window] [in a new window]   Fig. 2. Phosphorus and K uptake in MP, CT, and NT at different measurement dates after corn planting in compost amended and nonamended soil in 2003 and 2004 near Ames, IA. Capital T and A indicate statistical significance for tillage and amendment treatments and interactions (T x A) at P values < 0.1.