What this means for your programme
Do not choose one harvest date from the range without a local planting record. Published CERES coefficients for Pathum Thani 1 must not be assigned to San Pa Tong 1.
Planning interpretation by soil.ag, based on the profile below.
Where it fits
Central irrigated areas. Soft mildly aromatic grain; historical profile reports blast, bacterial leaf blight and brown/white-backed planthopper resistance.
What to watch
Green leafhopper, rice ragged stunt and orange-leaf disease susceptibility noted in the profile.
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
104–126 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 4.8 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 · Pathum Thani 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 →