CORE Renewable Agriculture and Food Systems: 21(4); 253–260 DOI:Metadata, 10.1079/RAF2006161 citation and similar papers at core.ac.uk Provided by RERO DOC Digital Library Soil fertility management for organic rice production in the Lao PDR W. Roder1,*, S. Schu¨rmann2, P. Chittanavanh3, K. Sipaseuth3, and M. Fernandez4 1CIP/CFC, PO Box 670, Thimphu, Bhutan. 2Swiss College of Agriculture, Zollikofen, Bern, Switzerland. 3Project for the Promotion of Organic Farming and Marketing in Lao PDR, Vientiane, Lao PDR. 4Project Promotion of Organic Rice from Lao PDR, Vientiane, Lao PDR. *Corresponding author:
[email protected] Accepted 23 March 2006 Research Paper Abstract Rice is the most important agricultural commodity of the Lao People’s Democratic Republic (Lao PDR), produced largely using traditional methods with limited inputs of fertilizers and other chemicals. The country has a wide diversity in rice production systems and rice varieties, with over 3000 different varieties recorded. The rich diversity and the production environment and methods are favorable for organic rice production. Investigations were carried out to describe soil fertility conditions, management practices, opportunities and problems associated with organic production methods for rice. Soils used for rice production are mostly of low fertility, with low organic matter and N-availability. In spite of this, virtually no fertilizer inputs are used for upland rice production. Inorganic fertilizer inputs for lowland rice production have increased rapidly over the past decade, but are still below 20 kg ha-1. The most important nutrient sources are rice straw and manure from buffalo and cattle. Chromolaena odorata plays an important role in nutrient cycling in upland rice systems and is sometimes added to lowland fields.