关键词: 水稻, 根系, 指数模型, 根冠比

Abstract: The exponential model and correlation between root weight and shoot increment of rice,c.v.Gangyou22,Ⅱyou162 and Kyou047 in different tillage and transplanting methods,were investigated in a field experiment of spit design.The dry weight (DW) accumulation of root and shoot were suitable for exponential model well from transplanting to elongating stage.The coefficient determination (R²) of the model of shoot increment was over 0.94,and of root was more than 0.98.There was highly significant positive correlation between DW of shoot and roots.The root/shoot ratio was single peak curve from transplanting to elongating.The root/shoot ratio increased in early stage,and reached peak at 10-15 d after transplanting.The DW of shoot and roots of the broadcasted high standing-stubbles under no-tillage condition treatment was the lowest among all treatments,but its root/shoot ratio was higher than that of the conventional tillage transplanting rice.DW of top and roots of Gangyou22 was the highest,while root/shoot ratio of Ⅱyou162 was the highest among three cultivars.

Key words: rice(Oryza sativa L.), root system, exponential model, root/shoot ratio