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International Journal of Soil Science
  Year: 2015 | Volume: 10 | Issue: 3 | Page No.: 130-141
DOI: 10.3923/ijss.2015.130.141
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Spatial Patterns of Penetration Resistance and Soil Moisture Distribution in a Sandy Loam Soil (Eutric leptosol)

D. Lomeling and D. Mori Lasu

Bivariate relations between penetration resistance and soil moisture content was conducted on sandy loam soil (Eutric leptosol) at the University of Juba demonstration farm. Soil Penetration Resistance (PR) was measured using an Eijkelkamp pocket penetrometer to a depth of 0–15 cm depth with Soil Moisture Content (SMC) measured using an Eijkelkamp sensor theta probe. Measured SMC within the plots varied from 9–35% whereas, the PR varied from 0.1 to 4.5 kg cm–2. The results showed significant negative correlation between PR and SMC expressed by a polynomial function with r2 = 0.48 and Pearson Coefficient, R = –0.657. Spatial distribution of PR and SMC using both kriging and Inverse Distance Weighting (IDW) interpolation methods showed no significant differences. However, PR tended to decrease with an increasing SMC in an easterly direction. The results also showed that the spherical model gave the best fit for both PR and SMC at r2 = 0.527 and 0.747 with moderate and strong spatial dependency at 28.9 and 10.53%, respectively. Though the effective range A0, for both PR and SMC at 24.14 and 30.4 m, respectively were more or less similar, the strong spatial dependency of SMC suggested its significance as a limiting factor for plant growth as opposed to PR which on average was at 1.592 kg cm–2.
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How to cite this article:

D. Lomeling and D. Mori Lasu, 2015. Spatial Patterns of Penetration Resistance and Soil Moisture Distribution in a Sandy Loam Soil (Eutric leptosol). International Journal of Soil Science, 10: 130-141.

DOI: 10.3923/ijss.2015.130.141






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