1.Ca absorption and tipburn of lettuce were studied under different application of N, K, Ca, sprinkler irrigation and border irrigation in open field.

1.摘要在露地栽培条件下，研究了不同氮、钾、钙水平处理以及喷、生钙干烧心的影响。

2.The results showed: inncrease application of Ca, balance application of N and K and sprinkler irrigation could increase Ca content of lettuce leaves, reduce occurring of tipburn.

2.结果表明，增施钙肥，平衡氮、钾肥及采取喷的方式均能增加生叶片的钙含量，减少干烧心的发生。