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Comparison of Uniform- and Variable-Rate Phosphorus Fertilization for Corn–Soybean Rotations

Dep. of Agron., Iowa State Univ., Ames, IA 50011

View larger version (47K): [in a new window]   Fig. 1. Example (Field 6) of soil series map, treatment strips, initial soil-test P (means for cells defined by the width of each replication), and sampling points and cells for each treatment.