The Complete Guide to Rice Growing in Thailand

Thailand's Rice Heritage

Rice is the backbone of Thai agriculture, covering over 60 million rai (9.6 million hectares) and employing millions of farming families. Thailand consistently ranks among the world's top rice exporters, with Thai Hom Mali (Jasmine) rice commanding premium prices in international markets.

Choosing the Right Variety

Your choice of variety depends on your region, water availability, and target market:

• KDML 105 (Khao Dawk Mali) — The premium jasmine rice variety, best suited for irrigated lowlands in the Central Plains and parts of Isan.
• RD 15 — A photoperiod-sensitive glutinous rice popular in Northeast Thailand.
• Pathum Thani 1 — Non-photoperiod sensitive, allowing multiple crops per year in irrigated areas.
• RD 43 — Low glycemic index variety for health-conscious markets.

Land Preparation

Begin with a primary plow at 15-20 cm depth after the first rains, typically in May. Allow the soil to soak for 2-3 weeks, then perform a second tillage to puddle the soil and level the field. Laser leveling, available through many Thai agricultural cooperatives, improves water distribution and can increase yields by 10-15%.

Transplanting vs. Direct Seeding

Transplanting produces higher yields (typically 10-20% more) but is labor-intensive. Direct seeding reduces labor costs but requires excellent weed management. Many Thai farmers are shifting to direct seeding with drum seeders to reduce production costs.

Water Management

Alternate wetting and drying (AWD) saves 15-30% of water compared to continuous flooding while maintaining yields. Maintain 3-5 cm of standing water during the critical reproductive stage (booting to flowering) to prevent yield loss.

Harvest Timing

Harvest when 80-85% of grains have turned golden. Delayed harvest leads to grain shattering and quality loss. Use a moisture meter — optimal harvest moisture is 20-25%, then dry to 14% for storage. Modern combine harvesters reduce post-harvest losses from 10-15% (manual) to under 3%.