The sum of loose degree in top 3leaves of Shanyou 63 and Wuyungeng 8 was 7.86 and 3.73, respectively.

• 有效分蘖期（N-n期）植株叶开角大，叶片较长，叶片松散度适宜，汕优63顶部三叶松散度之和7.；86度，武运粳8号3