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Advances in Agriculture
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Advances in Agriculture
/
2018
/
Article
/
Tab 1
/
Research Article
Biological Nitrogen Fixation by Local and Improved Genotypes of Cowpea in Burkina Faso (West Africa): Total Nitrogen Accumulated can be used for Quick Estimation
Table 1
Main physicochemical characteristics of the topsoil (0-20 Cm).
Clay (%)
6
Sand (%)
72
pH H
2
O
6.1
Silt (%)
20
pH KCl
5.2
Organic C (%)
0.59
Ca
++
(cmol
+
kg
−1
soil)
1.10
Total N (mg kg
−1
)
410
K
+
(cmol
+
kg
−1
soil)
0.05
Total P (mg kg
−1
)
79.0
Mg
++
(cmol
+
kg
−1
soil)
0.40
Avail.-P Bray I (mg kg
−1
)
5.0
ECEC (cmol+ kg
−1
soil)
1.70
Available K (mg kg
−1
)
543