@article{rippy_nelson_2007, title={Cation exchange capacity and base saturation variation among Alberta, Canada, moss peats}, volume={42}, number={2}, journal={HortScience}, author={Rippy, J. F. M. and Nelson, P. V.}, year={2007}, pages={349–352} }
 @article{rippy_nelson_hesterberg_kamprath_2007, title={Reaction times of twenty limestones}, volume={38}, ISSN={["1532-2416"]}, url={http://www.scopus.com/inward/record.url?eid=2-s2.0-34447308205&partnerID=MN8TOARS}, DOI={10.1080/00103620701435530}, abstractNote={Abstract Particle size and calcium carbonate equivalent characterize agricultural limestone. When agricultural limestone is used for horticultural container substrates, variations in pH among batches of substrate produced with the same limestone rate, as well as pH drift from initial pH, occur. Horticultural endeavors require more detailed characterization of limestone neutralization capacity than is provided for agricultural limestones. Reactivity of twenty limestones encompassing a broad range of calcium and magnesium carbonate were compared. Limestones were wet‐sieved into three particle‐diameter fractions and reacted with ammonium chloride in the presence of steam. Fine particles reacted faster than coarse; however, there was a point beyond which degree of fineness of calcitic limestone no longer affected reactivity. Dolomitic limestones were slower reacting than calcitic. Reactivity within particle fractions of dolomitic and coarse calcitic limestones varied significantly. These results indicate that particle diameter and calcium carbonate equivalent are not the only factors influencing limestone neutralization capacity.}, number={13-14}, journal={COMMUNICATIONS IN SOIL SCIENCE AND PLANT ANALYSIS}, author={Rippy, Janet F. M. and Nelson, Paul V. and Hesterberg, Dean L. and Kamprath, Eugene J.}, year={2007}, pages={1775–1783} }
 @article{rippy_nelson_2005, title={Soilless root substrate pH measurement technique for titration}, volume={40}, number={1}, journal={HortScience}, author={Rippy, J. F. M. and Nelson, P. V.}, year={2005}, pages={201–204} }
 @article{peet_rippy_nelson_catignani_2004, title={Organic production of greenhouse tomatoes utilizing the bag system and soluble organic fertilizers}, volume={659}, ISBN={["90-6605-259-7"]}, ISSN={["0567-7572"]}, DOI={10.17660/actahortic.2004.659.92}, abstractNote={ISHS VII International Symposium on Protected Cultivation in Mild Winter Climates: Production, Pest Management and Global Competition ORGANIC PRODUCTION OF GREENHOUSE TOMATOES UTILIZING THE BAG SYSTEM AND SOLUBLE ORGANIC FERTILIZERS}, number={659}, journal={PROCEEDINGS OF THE VIITH INTERNATIONAL SYMPOSIUM ON PROTECTED CULTIVATION IN MILD WINTER CLIMATES: PRODUCTION, PEST MANAGEMENT AND GLOBAL COMPETITION, VOLS 1 AND 2}, author={Peet, MM and Rippy, JM and Nelson, PV and Catignani, GL}, year={2004}, pages={707–719} }
 @article{rippy_peet_louws_nelson_orr_sorensen_2004, title={Plant development and harvest yields of greenhouse tomatoes in six organic growing systems}, volume={39}, number={2}, journal={HortScience}, author={Rippy, J. F. M. and Peet, M. M. and Louws, F. J. and Nelson, P. V. and Orr, D. B. and Sorensen, K. A.}, year={2004}, pages={223–229} }