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Figure 1


Fig. 1. Changes in the {delta} 13C value of the mobile humic acid fraction for the surface layer of a Philippine soil under two crop rotations. DS is dry season, WS is wet season. Soil samples were collected at the midtillering crop growth stage and at shortly before harvest in each season from 1994 to 1996. Vertical bars at each data point represent standard errors.





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The SCI Journals Agronomy Journal Crop Science
Journal of Natural Resources
and Life Sciences Education		 Vadose Zone Journal
Journal of Plant Registrations Journal of
Environmental Quality		 The Plant Genome