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

结果表明：随着叶片中钙含量的下降，干烧心病症逐渐出现。

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

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。

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