SSC462 Soil Tolerance2 Notes

SSC462 Soil Tolerance2 Notes - S OIL E ROSION Principle...

Info iconThis preview shows pages 1–4. Sign up to view the full content.

View Full Document Right Arrow Icon

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full DocumentRight Arrow Icon

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full DocumentRight Arrow Icon
This is the end of the preview. Sign up to access the rest of the document.

Unformatted text preview: S OIL E ROSION Principle agricultural productivity must be indefinitely sustained http://www.nrcs.usda.gov/technical/nri/2003/nri03eros- mrb.html Estimated average annual erosion on nonfederal rural land (tons/acre/year) Year Cropland CRP land Pastureland Cultivated Noncultivate d Total Water Erosion (t/ac/yr) 1982 4.4 0.7 4.0---- 1.1 1987 4.0 0.7 3.7 2.0 1.0 1992 3.5 0.6 3.1 0.6 1.0 1997 3.1 0.7 2.8 0.4 0.9 2002 2.9 0.6 2.6 0.4 0.9 Wind Erosion (t/ac/yr) 1982 3.6 0.4 3.3---- 0.1 1987 3.5 0.4 3.2 6.8 0.1 1992 2.7 0.2 2.4 0.7 0.1 1997 2.5 0.2 2.2 0.3 0.1 2002 2.4 0.2 2.1 0.3 0.1 soil loss ≤ soil gain NC Human induced water erosion Average annual soil loss 2 x 10 9 t/yr over ~400 x10 6 ac cropland = 5 t/ac/yr 1 x10 4 lb/ac/yr 2 x 10 6 lbs------------------------- =-------------------- x ac-6.7in x = 0.03 in/ac/yr Soil Loss vs. 0.002 in/ac/yr Soil Formation (1”/500yrs) S OIL L OSS T OLERANCE (T) maximum average annual soil loss (t/ac/yr) that will permit current production levels to be...
View Full Document

This note was uploaded on 08/01/2008 for the course SSC 462 taught by Professor Havlin during the Spring '08 term at N.C. State.

Page1 / 6

SSC462 Soil Tolerance2 Notes - S OIL E ROSION Principle...

This preview shows document pages 1 - 4. Sign up to view the full document.

View Full Document Right Arrow Icon
Ask a homework question - tutors are online