Abstract: Field trial and laboratory analysis were used to evaluate the differences between two indica rice varieties in K-production efficiency and related physiological features. The results indicated that K-production efficiency of the G88-293 variety was 28.8% higher than that of Zhe 852. The advantages in physiological features of the G88-293 possesses over Zhe 852 are as following: 1) Relatively smaller requirement for K in whole life period but higher percentage of K absorption and accumulation during early to middle growth stages; 2) Higher NP content of plants at early growth stages and higher K and K/N ratio in whole life; 3)Higher photosynthetic rate of flag leaves and higher storage of total sugar in stem and sheath at heading stage; 4) Prefered harvest index.

Key words: K-production efficiency, K-using efficiency, Physiological features

摘要： 以田间试验和室内分析评价水稻早籼品种G88-293和浙852钾素生产效率及相关生理特性的差异。结果显示，G88-293品种钾素生产效率高于浙852达28.8%，其生理特性的优势主要表现为：1）全生育期需钾较少，但生育前，中期累积的钾素量及占总疸的非分率超过浙852；2）生育前期植株具有较高的N、P含量，全生育期保持较高的含K率和K／N；3）齐穗期剑叶光合速率及茎鞘总糖积累量明显高于浙852；4）收获期具有较高的经济系数。

关键词: 钾素, 利用效率, 生理特性, 籼稻, 品种