Abstract: The experimental results are as follows: 1. The uptake ratio of 15N fertilizer increases with the increase in the yields of different rice varieties. The differences in the uptake ration of 15N fertilizer of rice are not distinct from one variety to another at the stage of tillering , but the diffe

Key words: Indica rice variety, Dressing period, 15N-labeled urea, Uptake ratio on 15N fertilizer