Mineralizable phosphorus, nitrogen, and carbon relationships in dairy manure at various carbon-to-phosphorus ratios

作者：Dao Thanh H^*; Schwartz Robert C

来源：Bioresource Technology, 2010, 101(10): 3567-3574.

DOI：10.1016/j.biortech.2009.12.070

• Manure nutrients
• Mineralization-immobilization
• Carbon-to-phosphorus ratio
• Enzyme-labile organic phosphorus
• Linked carbon-nitrogen-phosphorus
• mineralization

Phosphorus (P) in animal manure can be an important nutrient for crops or an environmental contaminant if in excess. Organic P in dairy manure may add to the environmentally bioactive P pools upon mineralization. A 353 d incubation study of manures containing C:P between 83 and 130:1 was conducted to determine linkages between C and P transformations and the effects of C:P on the immobilization-mineralization of manure P. As C:P widened from 83:1 to 130: 1, P mineralization increased and phosphate accumulated at rates between 0.013 and 0.021 mg kg(-1) d(-1). Water-extractable C was positively correlated with N:P, particularly at narrow C:P (P < 0.001). Absence of a negative feedback by phosphate suggested that P mineralization occurred with degradation of organic P-containing C substrates and appeared incidental to microbial P needs. Carbon content in manure may be managed to lower risks of elevated soluble P and C losses under non-limiting N conditions. Published by Elsevier Ltd.

• 出版日期2010-5