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Impact of Crude Oil on Soil Nitrogen Dynamics and Uptake by Legumes Grown in Wetland Ultisol of the Niger Delta, Nigeria

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Figure

Table 1. Some properties of the treated and untreated soil samples.
Figure 1. Shoot N and Root N during the growing period for Centrosema pubuscens, Calopogonium mucunoides and Puer-aria phaseoloides grow in four soils with different hydrocarbon contents
Table 2. Mineral N, microbial C to microbial N ratio and mineral N in the four soils planted with centrosema, calopo and pueraria
Figure 2. Urease activity in the four soils with different hydrocarbon content during the growing period under centrosema, calopogonium and pueraria

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