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Prepared by

Philip W. Westerman, Professor, Department of Biological and Agricultural Engineering

Karl A. Shaffer, Extension Associate, Department of Soil Science

J. Mark Rice, Extension Specialist, Department of Biological and Agricultural Engineering

College of Agriculture & Life Sciences

North Carolina State University

The use of trade or brand names in this publication

does not imply endorsement of products mentioned

or criticism of similar products not mentioned.

Copyright (c) 2008 by North Carolina State University

Published by

North Carolina Cooperative Extension Service

North Carolina Cooperative Extension

 

College of Agriculture & Life Sciences

 

NC State University

 

Distributed in furtherance of the acts of Congress of May 8 and June 30, 1914. North Carolina State University and North Carolina A&T State University commit themselves to positive action to secure equal opportunity regardless of race, color, creed, national origin, religion, sex, age, veteran's status, or disability. In addition, the two Universities welcome all persons without regard to sexual orientation. North Carolina State University, North Carolina A&T State University, U.S. Department of Agriculture, and local governments cooperating

AG-639W E09-51800 (Revised, August 2008) BS