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Annual Course of Matric Potential in Differently Used Savanna Oxisols in Brazil

Juliane Lilienfeina, Wolfgang Wilckea, Miguel Angelo Ayarzab, Samuel do Carmo Limac, Lourival Vilelad and Wolfgang Zecha

a Inst. of Soil Science and Soil Geography, Univ. of Bayreuth, D-95440 Bayreuth, Germany
b CIAT-Laderas, Apartado 1410, Tegucigalpa, Honduras
c Federal Univ. of Uberlândia, 38406-210 Uberlândia-MG, Brazil
d EMBRAPA-Cerrado, Caixa Postal 08223, Planaltina-DF, Brazil



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  		Fig. 1 Locations of the study sites (CE, native Cerrado; PI, Pinus; NT, no-till cropping; CT, conventional tillage; DP, degraded pasture; and PP, productive pasture)

 


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  		Fig. 2 Precipitation between 1 Apr. 1997 and 28 Apr. 1998 recorded at the Fazenda Pinusplan, a commercial farm

 



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  		Fig. 3 Course of matric potentials ({psi}M) at (a) 0.15-, (b) 0.30-, (c) 0.80-, (d) 1.20-, and (e) 2.00-m depth in soils of native Cerrado (CE), Pinus (PI), no-till cropping (NT), conventional tillage cropping (CT), degraded pasture (DP), and productive pasture (PP) between 27 Mar. 1997 and 28 Apr. 1998. Shown values are averages of three replicates per treatment

 


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  		Fig. 4 Measured (data points) and fitted (lines) soil water characteristic curves in two selected soils in each of Cerrado (CE) and conventional tillage (CT) treatments (CE1 and CT2 in Fig. 1) at 0- to 0.15-, 0.15- to 0.30-, 0.30- to 0.80-, 0.80- to 1.20-, and 1.20- to 2.00-m depths

 




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