1. Soil Phosphorus Fractions and Legacy after Long-term Fertilizer Placement in a Corn-Soybean Rotation

Phosphorus (P) fertilizer placement can affect plant P uptake during the growing season, however, the long-term interaction of placement and plant root P uptake can also affect soil P pools. The objective of this study was to evaluate the influence of long-term P fertilizer placement on soil P pools (labile, moderately labile and non-labile) and legacy soil P accumulation under a corn (Zea mays) -soybean (Glycine max (L.) Merr.) rotation. A field study was conducted for ten years from 2006-... M. Coelho, D. Ruiz diaz, G. Hettiarachchi, F. Hansel