不同甘蔗品种对低钾红壤的适应性

Adaptation of Sugarcane Cultivars to Red Earth With Low-K

台糖134吸钾能力最强,能较好地在低钾红壤上生长,但钾素生产效率中等;仙糖73/35耐低钾能力也较强,钾素生产效率较高,但施钾效应较低,其产量也不如台糖134;闽选703的钾素生产效率较高,耐低钾能力中等;闽糖70/611吸钾能力和钾素生产效率都较低,耐低钾能力很弱,施钾效应极显著,只有供钾充足时,才能发挥该品种的产量潜力.

Among the four cultivars examined,F 134 was characterized by a strongest K absorbing ability and a moderate K production efficiency (defined as the dry matter pro- duced per unit of K absorbed) and was more adaptive to low K soil.Xiantang 73/35 also showed a relatively strong K absorbing ability and a high K production efficiency.However, its yield potential was considerable lower than that of F134.Minxum 703 had a high K pro- duction efficiency and a moderate adaptation to low K production efficiency and a moderate adaptation to low K soil.Whilst Mintang 70/611 showed a poorest adaptation to low K soil with lowest K absorbing ability and K production efficiency.Its yield potential would only be reached when ample K supply was available.