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Chemical and Physical Changes Following Co‐Composting of Beef Cattle Feedlot Manure with Phosphogypsum
Author(s) -
Zvomuya Francis,
Larney Francis J.,
Nichol Connie K.,
Olson Andrew F.,
Miller Jim J.,
DeMaere Paul R.
Publication year - 2005
Publication title -
journal of environmental quality
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.888
H-Index - 171
eISSN - 1537-2537
pISSN - 0047-2425
DOI - 10.2134/jeq2005.0090
Subject(s) - phosphogypsum , feedlot , manure , compost , straw , zoology , fertilizer , chemistry , phosphorus , nitrogen , agronomy , nutrient , raw material , biology , inorganic chemistry , organic chemistry
Nitrogen (N) loss during beef cattle ( Bos taurus ) feedlot manure composting may contribute to greenhouse gas emissions and increase ammonia (NH 3 ) in the atmosphere while decreasing the fertilizer value of the final compost. Phosphogypsum (PG) is an acidic by‐product of phosphorus (P) fertilizer manufacture and large stockpiles currently exist in Alberta. This experiment examined co‐composting of PG (at rates of 0, 40, 70, and 140 kg PG Mg −1 manure plus PG dry weight) with manure from feedlot pens bedded with straw or wood chips. During the 99‐d composting period, PG addition reduced total nitrogen (TN) loss by 0.11% for each 1 kg Mg −1 increment in PG rate. Available N at the end of composting was significantly higher for wood chip–bedded (2180 mg kg −1 ) than straw‐bedded manure treatments (1820 mg kg −1 ). Total sulfur (TS) concentration in the final compost increased by 0.19 g kg −1 for each 1 kg Mg −1 increment in PG rate from 5.2 g TS kg −1 without PG addition. Phosphogypsum (1.6 g kg −1 P) addition had no significant effect on total phosphorus (TP) concentration of the final composts. Results from this study demonstrate the potential of PG addition to reduce overall N losses during composting. The accompanying increase in TS content has implications for use of the end‐product on sulfur‐deficient soils. Co‐composting feedlot manure with PG may provide an inexpensive and technologically straightforward solution for managing and improving the nutrient composition of composted cattle manure.