Resource Magazine March/April 2014 : Page 3

March/April 2014 Vol. 21 No. 2 Magazine Staff: Donna Hull, Publisher,; Sue Mitrovich, Managing Editor,; Glenn Laing, Contributing Editor,; Melissa Miller, Professional Opportunities and Production Editor,; Sandy Rutter, Professional Listings,; Darrin Drollinger, ASABE Executive Director, Editorial Board: Chair Tony Grift, University of Illinois; Past Chair Brian Steward, Iowa State University; Thomas Brumm, Iowa State University; Victor Duraj, University of California, Davis; Israel Sunday Dunmade, Mount Royal University of Calgary; Rafael Garcia, USDA-ARS; Christopher Henry, University of Arkansas; Shane Williams, Kuhn North America; Chad Yagow, John Deere Harvester Works; Jeong Yeol Yoon, University of Arizona. Resource: Engineering & Technology for a Sustainable World (ISSN 1076-3333) (USPS 009-560) is published six times per year— January/February, March/April, May/June, July/August, September/October, November/December—by the American Society of Agricultural and Biological Engineers (ASABE), 2950 Niles Road, St. Joseph, MI 49085-9659, USA. POSTMASTER: Send address changes to Resource, 2950 Niles Road, St. Joseph, MI 49085-9659, USA. Periodical postage is paid at St. Joseph, MI, USA, and additional post offices. SUBSCRIPTIONS: Contact ASABE order department, 269-932-7004. COPYRIGHT 2014 by American Society of Agricultural and Biological Engineers. Permission to reprint articles available on request. Reprints can be ordered in large quantities for a fee. Contact Donna Hull, 269-932-7026. Statements in this publication represent individual opinions. Resource: Engineering & Technology for a Sustainable World and ASABE assume no responsibility for statements and opinions expressed by contributors. Views advanced in the editorials are those of the contribu-tors and do not necessarily represent the official position of ASABE. engineering and technology for a sustainable world March/April 2014 FEATURES 4 The Fate, Transport, and Impact of Estrogens Applied During Wastewater Irrigation Heather Gall and Herschel Elliott As concerns about the presence of unregulated compounds in drinking water sources continue to grow, alternative solutions for managing wastewater are becoming increasingly appealing. 4 6 A New Study of Urban Farming in Los Angeles Zach Rehm What does urban agriculture look like? How is it regulated? Who engages in it? How and where is city-grown produce sold? 9 The Role of Biological and Agricultural Engineers in Sustainable Agriculture Marty Matlock First in a series: What is the role of the engineer? 12 Using 21st Century Technology to Grow the Oldest Renewable Resource: Trees 6 Nabil Mohamed Technology can enable agroforestry to efficiently and economically produce fiber from trees—sustainably and in an ecofriendly manner. 16 A Spiral Curriculum for BSE at Virginia Tech: An Update Mary Leigh Wolfe The journey of implementing spiral learning in a curriculum continues— and brings significant impacts. 18 The “Threads” of Biosystems Engineering Demetres Briassoulis The fabric of the discipline calls for an international definition. 12 20 Engineering that is Inspired by Biology Mark A. Eiteman Because biology is so intimately linked to the need for food, the opportunities to inform the design of agricultural systems are particularly promising. UPDATE 23 24 25 26 28 28 Offset design improves round-bale unroller Cellulose nanocrystals are a “green” wonder material Kitty litter: A new use for spent corn grains Algae to crude oil: Million-year natural process takes minutes in the lab Biodegradable packaging from cotton waste New technique may drive down biofuel production costs ON THE COVER Heather Gall collects a water sample from a vernal pool in central Pennsylvania. Photo courtesy of Tracy Langkilde. CORRECTION The photo caption on page 11 in the Nov./Dec. Resource reversed the order of the men pictured. Richard A. Cavaletto is on the right, and Ephrem Teklehaimanote is on the left. We regret the error. 26 DEPARTMENTS 2 29 30 31 From the President/Events Calendar Professional Opportunities Professional Listings Last Word: I Love Teaching, but I Hate Grading William Kisaalita American Society of Agricultural and Biological Engineers 2950 Niles Road St. Joseph, MI 49085-9659, USA 269.429.0300, fax 269.429.3852,

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