But leaf color (SPAD) descended quickly.The roots grew stagnantly, root length and number of roots stopped increasing, the activity of root and root/shoot ratio descended quickly, and obviously.

• 但秧苗叶色(SPAD值)迅速下降, 地下部生长停滞, 根长、根数停止增加, 根系活力迅速下降, 根冠比明显降低。