选用耐缺锰能力不同的 7个油菜品种和 2个小麦品种 ,在水旱轮作的严重缺锰土壤上 ,进行了 2种作物不同品种耐缺锰能力的比较研究。结果表明 ,在同样的缺锰土壤上 ,油菜的耐缺锰能力明显高于小麦。 7个油菜品种中 ,有 5个品种仅在秧田期出现了轻度缺锰症 ,但持续时间较短 ,移栽至大田后所有油菜品种均未出现缺锰症 ,且缺锰处理植株叶色、长势和收获后的籽粒产量与正常供锰处理相比没有明显差异。而 2个小麦品种则从分蘖期开始出现缺锰症 ,并一直持续到孕穗期。其中 ,耐缺锰能力相对较弱的川麦 2 2号发病更为严重。缺锰胁迫使小麦减产 30 %以上。在水旱轮作的缺锰土壤上 ,直播油菜相对产量略高于移栽油菜 Seven rapeseed cultivars and two wheat cultivars with different tolerance to manganese deficiency were selected to study the ability of different cultivars to tolerant to manganese deficiency on the severely manganese-deficient soils. The results showed that in the same Mn-deficient soil, rapeseed had significantly higher tolerance to manganese deficiency than wheat. Among 7 rape cultivars, 5 cultivars showed slight Mn deficiency only in seedling stage, but their duration was short. No Mn deficiency occurred in all rapeseed cultivars after transplanting to the field, , There was no significant difference between the grain yield after harvest and after harvesting compared with the normal treatment with manganese. However, two wheat cultivars began to have Mn deficiency disease from tillering stage and continued to booting stage. Among them, Chuanmai 2 2, which is relatively weaker than Mn-tolerant, is more serious. Manganese-deficient stress reduces wheat yield by more than 30%. The relative yield of live rapeseed was slightly higher than that of transplanted rapeseed on paddy-soil lacked rotation and rotation