Studies on sick soil and establishment of plant growth improving method

芦笋衰退的症状具有共同的组织学特征，与镰刀菌根腐病的症状相吻合，说明生物因素是导致芦笋衰退的主要原因。接种非致病性尖孢镰刀菌（Fusarium oxysporum）对黄瓜的根腐病和冠腐病均有一定的抗性，NaCl处理对黄瓜的根腐病和冠腐病有协同作用。抗氧化能力和游离氨基酸与抗病性密切相关。

Symptoms of asparagus decline had common histological characteristics, which coincide with the symptoms of Fusarium root rot, so that biological factors mainly lead to the decline phenomena. Tolerance to Fusarium crown and root rot occurred by the inoculation of arbuscular mycorrhizal fungi, non-pathogenic Fusarium oxysporum, in addition, synergetic effects appeared by NaCl treatment. Antioxidative ability and free amino acids showed close association with the disease tolerance.