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Soil Sampling Strategies for Precision Agriculture Research under Sahelian Conditions

J.W. van Groenigena, M. Gandahb and J. Boumac

a Soil Sci. Div., Int. Inst. for Aerospace Survey and Earth Sci. (ITC), P.O. Box 6, 7500 AA Enschede, the Netherlands, currently at Univ. of California-Davis, Dep. of Agron. and Range Sci., 1 Shield Av., Davis, CA 95616-0515 USA
b Institut National de Recherche Agronomique du Niger (INRAN), B.P. 429, Niamey, Niger
c Dep. of Environ. Sci., Wageningen Agricultural Univ., P.O. Box 37, 6700 AA Wageningen, The Netherlands



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  		Fig. 1 Results of a semiquantitative scoring at three dates for Plot 3. Scoring values ranged from 0 (no plants at all) to 8 (maximal aerial biomass). Results are presented using Thiessen Polygons

 


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  		Fig. 2 Relationship between scoring value and yield (mean and standard deviation), measured per hill

 


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  		Fig. 3 Interpolated yield estimates with position of (a–c) shrubs and (d–f) interpolated relief

 


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  		Fig. 4 The three sampling scheme for the three plots, superimposed on yield estimates. (a–c) Scheme 1 optimized uniform spreading of the 27 observations over the plot, (d–f) Scheme 2 optimized coverage of the yield range, and (g–i) Scheme 3 optimized coverage of the low-producing areas
 




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