Effect of remained stem height on yield, quality of I. and on soil water content.

To explore the reason causing low yield, poor quality of , this paper investigated the influence of different remained stem heights on the yield, quality and water consumption of in Gannan plateau area using field single factor randomized block method. Research results showed that which was cut before blooming period in the last ten-day of July with remained stem height of 25 cm had the lowest water consumption, the best underground root traits (including main root length, root diameter, and root dry weight per plant), and the highest yield which was higher that control group by 18.73% (P < .