Soil Chemical Changes under Irrigated Mango Production in the Central São Francisco River Valley, Brazil
R. J. Heck*,a,
H. Tiessenb,
I. H. Salcedod and
M. C. Santosc
a Dep. of Land Resource Science, Univ. of Guelph, Guelph, ON, Canada
b Dep. of Soil Science, Univ. of Saskatchewan, Saskatoon, SK, Canada
c Dep. of Agronomy, Federal Rural Univ. of Pernambuco, Recife, Brazil
d Dep. of Nuclear Energy, Federal Univ. of Pernambuco, Recife, Brazil
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Fig. 1. Map of Pernambuco state in northeastern Brazil, showing the location of the Nilo Coelho study site beside the São Francisco River.
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Fig. 2. Surface elevation map of the Nilo Coelho study site. The lowest relative elevation measured was taken as the local datum. Arrows indicate slope direction calculated from the digital elevation model by the program TOPO (Pennock, 1993).
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Fig. 3. Elevation map of the subsurface rock layer at the Nilo Coelho study site. The local datum is the same as in Fig. 2.
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Fig. 4. Ratio of actual moisture to field capacity of the Bt1 horizon at the Nilo Coelho study site at time of sampling. Values above 100% indicated the water potential was above 0.3 MPa.
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Copyright © 2003 by the American Society of Agronomy, Crop Science Society of America, and Soil Science Society of America.
