期刊
COMMUNICATIONS IN SOIL SCIENCE AND PLANT ANALYSIS
卷 46, 期 7, 页码 889-903出版社
TAYLOR & FRANCIS INC
DOI: 10.1080/00103624.2015.1011751
关键词
class B biosolids; application rate; surface application; NPK; Application duration
资金
- USDA-CSREES National Research Initiative Managed Ecosystems Program [2008-35101-04440]
- NIFA [583310, 2008-35101-04440] Funding Source: Federal RePORTER
The objective of this study was to evaluate soil nutrient loading and depth distributions of extractable nitrogen (N), phosphorus (P), and potassium (K) after long-term, continuous annual surface applications of anaerobically digested class B biosolids at a municipal recycling facility in central Texas. Commercial forage production fields of coastal bermudagrass (Cynodon dactylon L.) were surface applied at 0, 20, 40, or 60Mg dry biosolids ha(-1)y(-1) for 8years. Application duration was evaluated in fields treated with 20Mg dry biosolids ha(-1)y(-1) for 0, 8, or 20years. Total soil loads of extractable inorganic N and P increased linearly with application rate, but only extractable P increased with duration. Neither total load nor soil distribution of extractable K was affected by biosolid applications. Mineralization of biosolid-derived organic N and P likely contributed to elevated concentrations of nitrate throughout the soil profile (0-110cm) and orthophosphate in surface soils (0-40cm).
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