We found a match
Your institution may have rights to this item. Sign in to continue.
- Title
Soil Testing to Predict Dissolved Reactive Phosphorus Loss in Surface Runoff from Organic Soils.
- Authors
Zheng, Z. M.; Zhang, T. Q.; Wen, G.; Kessel, C.; Tan, C. S.; O'Halloran, I. P.; Reid, D. K.; Nemeth, D.; Speranzini, D.
- Abstract
Phosphorus loss from surface runoff contributes to eutrophication of surface water, a problem that is often severe from polders with organic soils where agricultural production is intensive. A soil P test is essential to predict the potential for P losses to precisely conduct environmental risk assessment and to efficiently develop and evaluate beneficial management practices. This study evaluated the possibility of using the environmental and agronomic soil P tests, soil P sorption index (PSI), and degree of soil P saturation (DPS), which are used for mineral soils, to predict surface runoff dissolved reactive P (DRP) from organic soils. forty-four soils from eight subgroups representative of organic lands across Ontario were selected to provide a wide range of soil test P (STP) within each category. A surface runoff study was conducted following the U.S. national Phosphorus Research Project protocol. flow-weighted mean runoff DRP concentration (DRP30) was linearly related to soil water- and CaCl2--extractable P concentrations but with data distribution patterns that inefficiently represented the soil vari- ability in P release potentials. The runoff DRP30 was significantly related to Bray-1 P and FeO-extractable P concentrations in split-line models, each with a change point, but not to Mehlich-3 P and Olsen P. All DPS values calculated based on STP and their derived PSis were closely related to runoff DRP30 in either a linear or a split-line model. The DPS values expressed as Bray-1 P/(PSI + Bray-1 P) and FeO P/(PSI + FeO P) showed the highest correlation with runoff DRP30 and thus can be recommended as environmental risk indicators of surface runoff DRP from organic soils.
- Subjects
SOIL testing; HISTOSOLS; EUTROPHICATION; RUNOFF; PHOSPHORUS in soils
- Publication
Soil Science Society of America Journal, 2014, Vol 78, Issue 5, p1786
- ISSN
0361-5995
- Publication type
Article
- DOI
10.2136/sssaj2014.02.0065