Cotton Yield and Changes in Soil Test Phosphorus over Time

Extractable soil phosphorus (P) can vary over time and is influenced by the crop being grown and the subsequent yield.  It is also affected by P application rate and other potential factors.  This replicated field trial was initiated in 2009 with P applications in the initial years.  No additional P has been added in the latter years with soil test P monitored following continuous cotton under rainfed (non-irrigated) growing conditions.  Seedcotton and lint yields have been measured from the center two rows of each plot with samples collected to determine lint percentage.  The initial study also compared fertilizer P applications with and without AVAIL Phosphorus Fertilizer Enhancer (Specialty Fertilizer Products, LLC).  A summary of yield data and soil test P data will be included.