In:
Soil Science Society of America Journal, Wiley, Vol. 76, No. 1 ( 2012-01), p. 161-167
Abstract:
Phosphorus fertilization may lead to increased P runoff and leaching, contributing to surface water and groundwater pollution. Plots of a 25‐yr field study in subtropical China representing eight P fertilization treatments were sampled to determine the effects of P fertilization on P loss potential and correlations among soil test P, soil neutral phosphatase activity, and water P content. Phosphorus fertilization increased soil test P and neutral phosphatase activity in the plow layer compared with P‐free fertilization. Total P content of paddy surface water increased with P fertilization, from 〈 0.01 to 0.35 mg L −1 . Phosphorus fertilization created P runoff loss risk, especially with the combined application of both inorganic fertilizers and organic amendments. The P runoff loss potential could be reduced or avoided by utilizing physical barriers on field margins to reduce or eliminate runoff. Soil neutral phosphatase activity, soil test P in the 0‐ to 5‐cm layer, and surface water P content were significantly and positively correlated. Soil neutral phosphatase activity contributed to soil test P and the potential of P runoff loss. Fertilization did not affect soil test P or neutral phosphatase activity beneath the plow layer or total P of paddy groundwater at the 100‐cm depth. The P content of paddy groundwater was not related to that of surface water, indicating that downward movement of P and P leaching did not occur. The results suggest that paddy wetland ecosystems can store P with proper management, especially for organic amendments.
Type of Medium:
Online Resource
ISSN:
0361-5995
,
1435-0661
DOI:
10.2136/sssaj2011.0078
Language:
English
Publisher:
Wiley
Publication Date:
2012
detail.hit.zdb_id:
241415-6
detail.hit.zdb_id:
2239747-4
detail.hit.zdb_id:
196788-5
detail.hit.zdb_id:
1481691-X
SSG:
13
SSG:
21
