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CONE INDEX AND SOIL PHYSICAL PROPERTY RELATIONSHIPS ON A SLOPING PALEUDULT COMPLEX1

 

作者: F. SIMMONS,   D. CASSEL,  

 

期刊: Soil Science  (OVID Available online 1989)
卷期: Volume 147, issue 1  

页码: 40-46

 

ISSN:0038-075X

 

年代: 1989

 

出版商: OVID

 

数据来源: OVID

 

摘要:

Tillage-induced pans in Atlantic Coastal Plain Paleudults exhibit high cone index (CI) values and restrict crop rooting. This study evaluated the residual effects of deep tillage and landscape position on the CI of E horizons from a complex of Typic and Arenic Paleudults. Soil cores were sampled from three tillage treatments [disk only (D), chisel-plowed (C), and subsoiled and bedded (SB)] across footslope and linear backslope landscape positions. Cone index, saturated hydraulic conductivity (K), and the soil water characteristic were measured on the soil cores in the laboratory. A tillage x landscape position interaction for CI was significant at the 0.01 level. The linear slope position had higher CI values than the footslope position for both the C and D treatments. Subsoiling resulted in lower CI values at the linear slope position than either the C or D treatments. Using a multiple stepwise regression procedure to develop description models, we found log10of the saturated hydraulic conductivity (Klog) to be the best single variable for predicting CI when data for all tillage treatments were pooled. The CI of E horizons, which had not previously been subjected to either chisel-plowing or subsoiling, was best predicted by depth to the EB or B horizon. A model containingKlog, bulk density, and depth of sample within the E horizon (EDP) explained 64% of the CI variability when all treatments were pooled.

 

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