Crop Production and Phosphorus Legacy with Long-Term Phosphorus- and Nitrogen-Based Swine Manure Applications under Corn-Soybean Rotation

The traditional manure management strategy, based on crop N needs, results in accumulation of phosphorus (P) soil due to the imbalance N/P ratio between requirement and supply. This study was conducted from 2004 2013 evaluate effects P-based liquid solid swine (LMP SMP, for manure, respectively) application, comparison with N-based application (LMN SMN, respectively), yield residual P under corn (Zea mays L.)–soybean (Glycine max L.) rotation a Brookston clay loam Lake Erie basin, ON, Canada. Chemical fertilizer (CFP) non-P treatments were included as controls (CK). For treatments, LMN showed lower annual (7.82 Mg ha?1) than LMP (9.36 ha?1), their differences even statistically significant at p < 0.05 some cropping years. also higher those SMP (7.45 SMN (7.41 CFP (8.61 although corresponding not (p 0.05) soybean, plots produced an average 0.98 ha?1 greater yields CK. No found treatments. close that CK (7.19 ha?1). grain removal (GPR) (18.6 kg soybean significantly other above-ground-P uptake (AGPU) both five test (STP) presented clear stratification, concentrating top 30 cm depth after 10 years application. contents STP increased 7.1 mg kg?1 12.4 45.5 kg?1, respectively. sum mass (0–30 cm) (31.6 largely identical (30.1 ha?1); however, (173.7 it rest Manure source availability coefficients averaged 1.06 1.07 addition phosphorus-based or can overcome drawback applications by potentially reducing adverse impact water quality while sustaining agronomic production.