What this means for your programme
Bring soil results, previous applications and crop observations into the rate decision. The release profile describes response qualitatively; it does not give a field-specific response curve.
Planning interpretation by soil.ag, based on the profile below.
Where it fits
Irrigated areas across Thailand. Nitrogen responsive and strong straw. Historical profile reports resistance to blast, ragged stunt and brown/white-backed planthoppers.
What to watch
Dry-season planting should not extend beyond March according to this profile; orange-leaf disease, bacterial leaf blight and bacterial leaf streak susceptibility.
These are historical variety descriptions. Check local scouting and current advice; a resistance claim does not rule out a problem in your field.
Use the calendar correctly
121–130 days. The short profile does not identify the starting event. Do not assume days after transplanting.
Record sowing, transplanting and observed stages separately so comparisons use the same clock.
What does the yield reference tell us?
Official release-profile yield reference; site, season, input treatment and grain moisture are not fully specified here. Not a national average, field forecast or promised yield.
A yield figure alone does not identify the right fertilizer rate. Compare records with their soil, water, inputs and harvest basis attached.
Can I use GDD for this variety?
Historical CSM-CERES-Rice coefficients are held in the research catalogue. They describe model phases, not a simple harvest-GDD target. Use the matching model, establishment convention and temperature method. Model reference ↗
Read the crop-stage guide →Reference: Thai Rice Department · Chai Nat 1 ↗. Official profile checked 27 September 2026.
Before choosing the next fertilizer split
Put previous applications, soil results, water management and crop observations beside the intended growth-stage window.
Review rice nitrogen timing →