Prepared by Marvin H.Hall,associate professor of Department of Agriculture e of Cooperative Extension Work,Actsof culture and the J r of Cooperative Extension,T This publication is available in alterative mediaon policy that ment without regard to personal character The Pennsylvania State eagainst national orign ce rel ous creed sex sexual orientationor File No.IVC2a R3M396ps 4 © The Pennsylvania State University 1992 Where trade names appear, no discrimination is intended, and no endorsement by the Cooperative Extension Service is implied. Penn State College of Agricultural Sciences research, extension, and resident education programs are funded in part by Pennsylva￾nia counties, the Commonwealth of Pennsylvania, and the U.S. Department of Agriculture. This publication is available from the Publications Distribution Center, The Pennsylvania State University, 112 Agricultural Administration Building, University Park, PA 16802. For information telephone (814) 865-6713. Issued in furtherance of Cooperative Extension Work, Acts of Congress May 8 and June 30, 1914, in cooperation with the U.S. Department of Agriculture and the Pennsylvania Legislature. J. L. Starling, Director of Cooperative Extension, The Pennsylvania State University. This publication is available in alternative media on request. The Pennsylvania State University is committed to the policy that all persons shall have equal access to programs, facilities, admission, and employment without regard to personal character￾istics not related to ability, performance, or qualifications as determined by University policy or by state or federal authorities. The Pennsylvania State University does not discriminate against any person because of age, ancestry, color, disability or handicap, national origin, race, religious creed, sex, sexual orientation, or veteran status. Direct all inquiries regarding the nondiscrimination policy to the Affirmative Action Director, The Pennsylvania State University, 201 Willard Building, University Park, PA 16802- 2801; tel. (814) 863-0471; TDD (814) 865-3175. File No. IVC2a R3M396ps Prepared by Marvin H. Hall, associate professor of agronomy