Speciation of Phosphorus in a Fertilized, Reduced-Till Soil System: In-Field Treatment Incubation Study

摘要: Phosphorus management in reduced-tillage systems is a great concern for farmers. Conclusive positive results of deep-banding P fertilizers compared with broadcast application and the chemistry remain unclear. Knowledge dominant solid species present soil following resulting potential availability would help us understand efficiently manage systems. The objective this research was to study influence placement (broadcast vs. deep-band P), fertilizer source (granular liquid time on reaction products under field conditions. Changes pH, resin-extractable P, total speciation were determined at different distances from point 5 wk 6 mo after rate 75 kg ha⁻¹ system that long-term reduced tillage. Resin-extractable lower treatments both periods. greater P-treated soils than granular soils. Speciation showed tended form Fe–P-like forms, whereas forms remained adsorbed P-like application; moreover, precipitated less when deep-banded. During 6-mo period application, granular, liquid, transformed Ca-phosphate or mixtures Ca-, Fe- adsorbed-phosphate-like as mainly forms. Deep-banding most likely provide solution agronomically environmentally efficient reduced-till