This publication describes our studies to determine the best root substrate to optimize greenhouse rice production. We recommend calcined clay granules. This version is updated to confirm suitability of a 1:1 mix of calcined clay and commercial soilless mixes. Photo of the plants growing using differing root media is provided, as well as close up image of the calcined clay we used.

This document is one entry in a series of questions and answers originally posted to the Purdue University Department of Horticulture & Landscape Architecture’s Plant Growth Facility Web site [http://www.hort.purdue.edu/hort/facilities/greenhouse/RiceMethod.shtml] regarding best practices for rice plant growth in a greenhouse. Controlled studies were conducted with the goals of optimizing growth and yield; developing standardized methodology using readily available commercial materials; and providing recommendations for large scale high-throughput production. Digital images showing treatment differences are included. A summary of recommendations; materials and methods description; and references list are available in separate documents.


Rice, Oryza, growing methods, greenhouse methods, greenhouse protocols, greenhouse best practices, Purdue methods, calcined clay, Turface

Date of this Version


Previous Versions

April 26, 2012
November 11, 2008