Geoscience Reference
In-Depth Information
Manure P205 Loading
in the Saginaw River Watersheds: 1987
P205/kg/Ha
0 - 2
3 - 5
6 - 7
8 - 10
11 - 114
N
0
5
10
20
30
40
Miles
Fig. 6.3 The manure applications
of both nitrogen and phosphate had steadily increased during the same period.
These applications, while accounting for only 3-8 % of total applied nutrients,
concentrated in urban areas including residential lawns, recreational parks, and golf
courses, were characterized by high intensity and frequency, and often combined
with irrigations. If not improperly managed, these non-farmland applications of
nutrients present a high contamination potential to both surface water and ground-
water. Thus, implementing best management practices in non-farmland nutrient
applications is also crucial for reducing the pollution potential in the study area (He
and Shi
1998
; He and Croley
2007b
; He et al.
2008
; He and DeMarchi
2010
).
