单词orthotropism
n.: 【植】直生性网络: 直向性；庸俗性
【植物;植物学】直生性
Endemic variety Cangzhou alfalfa was oppressed at hay yield, regeneration and orthotropism .
地方品种沧州苜蓿在草产量、再生性、直立性等方面均处于劣势。