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Castle International Resources is the leading source of information about the agricultural use of Cross-Linked Polyacrylamide (CLP), in the world. For nearly two decades we've annually sponsored and participated in scores of government and university research projects around the world on the use of CLP soil polymers.

Cross-linked polymer looks like rock salt when dry and captures up to 400 times its weight in rainwater. Used in agriculture, this material makes water and nutrients available to plants at all times, producing outstanding crop yields. CLP-raised plants mature faster, are more disease resistant, and can be effectively grown in areas of the world which are too low in annual rainfall to support cost-effective 'traditional' farming. The use of CLP in complete systems including special UV-stabilized landscape fabric and drip irrigation are the main focus of our current research efforts.

 Contact Information

After having a look at our Products & Services link (where you'll find the library of polymer articles), here is how to get more information:

Toll-Free Product Order Line: (888) 703-0222	Technical Support & Customer Service: (928) 282-4099
Castle International Resources 2370 West Highway 89A Ste 11 PMB 300 Sedona, Arizona, 86336-5341

In Memoriam

Daniel J. Wofford, Jr., was a retired Foreign Service officer with a farm background and a strong interest in research relating to problems of agriculture and water/soil conservation. He held a B.A. in Asian studies from the University of Oklahoma, and completed four years of graduate work in Far Eastern Studies and Geography at the University of Washington. On retiring from government service, he started Western Polyacrylamide, Inc. and devoted his efforts to researching and developing this promising water-conserving product, cross-linked polyacrylamide, most notably by keeping the price of it affordable for a wide variety of applications.

Apparently in good health, Dan unexpectedly suffered a stroke early in October 1998 and expired shortly thereafter. Dan's remains were interred next to his father's at the family burial site in Arkansas. He is greatly missed by us all.

Please note: This website was originally created by the Colorado corporation, Castle International Resources in collaboration with Dan Wofford and the then Colorado corporation, Western Polyacrylamide Inc. The articles were co-authored by Dan and I and the copyrights are jointly held. Castle's use of the federal trademark 'Hydrosource' was explicitly authorized by Dan in records on file at Castle's corporate offices. Although, during the year since Dan's death, Castle has continued to offer cross-linked polyacrylamide (CLP) under the Hydrosource name, our intent is to roll-out individually tested standardized grades of CLP in the spring of 2000, so that real science can be done by researchers and our customers will have the luxury of knowing exactly what their money is purchasing (since the quality and performance of CLP varies with each batch made by the manufacturers).