What this means for your programme
Treat a source harvest date as a planning reference for its region. Check the identity of any improved derivative rather than assuming it has the same stress response as RD6.
Planning interpretation by soil.ag, based on the profile below.
Where it fits
North and Northeast. Aromatic sticky grain; historical profile reports brown spot resistance and better drought tolerance than Niaw San Pa Tong.
What to watch
Blast, bacterial leaf blight, brown planthopper and gall midge susceptibility 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
Around 21 November in the source setting. Source calendar date; not a fixed duration after planting.
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?
Day length is part of this variety’s development. Accumulated heat can describe the season, but a single GDD total cannot substitute for its photoperiod response.
Read the crop-stage guide →Reference: Thai Rice Department · RD6 ↗. 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 →