Agriculture Reference
In-Depth Information
Nitrogen
140
120
100
80
Phosphorus
60
40
20
0
1961
1996 1961
Relative contribution of N and P
1996
Manure
Commercial fertilizer
Fig. 8.2.
Relative global use of manure and commercial sources of fertilizer in 1961 and 1996 (adapted from
Sheldrick
et al
., 2003).
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