结果表明：随着叶片中钙含量的下降，干烧心病症逐渐出现。

The results indicated that with the calcium content of leaves decreased the tipburn symptoms developed gradually and became visible finally.

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在露地栽培条件下，研究了不同氮、钾、钙水平处理以及喷灌、畦灌对生菜钙吸收和干烧心的影响。

Ca absorption and tipburn of lettuce were studied under different application of n, k, ca, sprinkler irrigation and border irrigation in open field.

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干烧心的始发病部位主要在叶缘和叶柄，症状主要表现为斑点和枯边，水渍只有50%的材料表现，心叶的症状表现与品种有密切关系。

The starting of tip-burn mainly on leaf's marginal and stem. Spot and rot are it's main symptoms, only 50% material show water strain. There is deep relation between symptoms and varieties.

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