根据同位素示踪技术证明的品种耐低钾能力强弱与钾缺乏时叶片暗呼吸强弱呈负相关关系的规律,将缺钾条件下培养的不同品种稻株,经一定时间的暗处理,然后根据未被黄化的绿叶数,作为鉴别品种耐低钾能力的指标。用含K~+为3—5 PPm的水培液培养不同品种的稻株,进入四叶期时,移入暗室, According to the law of isotope tracing technique that the variety resistant to low potassium has a negative correlation with the intensity of dark respiration of leaves under potassium deficiency, different varieties of rice cultivated under potassium deficient condition are treated dark for a certain period of time and then According to the number of unwashed green leaves, as an indicator of low potassium tolerance varieties. With K ~ + 3-5 PPm of the hydroponic culture of different varieties of rice plants, into the four-leaf stage, into the darkroom,