This particular rice field exemplifies the proper application of NPK fertilizers in accordance with the different growth stages of the rice plant. Alternatively, the farmer may have applied "ruoc hat" fertilizer (a type of fertilizer applied during the rice flowering stage) while the rice was still in the "dong" phase (a specific rice growth stage). As a result, the rice has ripened while the flag leaves (the uppermost leaves of the rice plant) remain green. This technique, known as "nuoi la dong," is typically only employed by experienced farmers and can potentially increase yields by 2-5% compared to other fields.
