Predicting phosphorus availability from soil-applied composted and non-composted cattle feedlot manure

Journal of Environmental Quality
Francis ZvomuyaBarry M Olson

Abstract

Prediction of phosphorus (P) availability from soil-applied composts and manure is important for agronomic and environmental reasons. This study utilized chemical properties of eight composted and two non-composted beef cattle (Bos taurus) manures to predict cumulative phosphorus uptake (CPU) during a 363-d controlled environment chamber bioassay. Ten growth cycles of canola (Brassica napus L.) were raised in pots containing 2 kg of a Dark Brown Chernozemic clay loam soil (fine-loamy, mixed, Typic Haploboroll) mixed with 0.04 kg of the amendments. Inorganic P fertilizer (KH2PO4) and an unamended control were included for comparison. All treatments received a nutrient solution containing an adequate supply of all essential nutrients, except P, which was supplied by the amendments. Cumulative P uptake was similar for composted (74 mg kg-1 soil) and non-composted manures (60 mg kg-1 soil) and for the latter and the fertilizer (40 mg kg-1 soil). However, the CPU was significantly higher for organic amendments than the control (24 mg kg-1 soil) and for composted manure than the fertilizer. Apparent phosphorus recovery (APR) from composted manure (24%) was significantly lower than that from non-composted manure (33%), but there was n...Continue Reading

References

Oct 2, 2001·Journal of Environmental Quality·Z He, C W Honeycutt
Jun 18, 2003·Journal of Environmental Quality·Francis J Larney, Robert E Blackshaw
Aug 23, 2003·Journal of Environmental Quality·Francis J LarneyTim A McAllister
Oct 11, 2003·Journal of Environmental Quality·Jim J MillerPaul Hasselback
Jul 1, 2004·Journal of Environmental Quality·B AjiboyeG J Racz
Nov 9, 2005·Journal of Environmental Quality·Francis ZvomuyaPaul R Demaere

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