The effect of N forms and NO-3-N/NH+4-N ratio on iron nutrition in hydroponically grown lettuce were investigated.

研究了硝态氮与氨态氮及其不同配比对水培生菜铁素营养的影响。

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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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There were significant negative correlations between nitrate content and total n, protein n, total p, protein p, protein K of lettuce leaf.

莴笋叶片硝酸盐含量与全氮、蛋白氮、全磷、蛋白磷和蛋白钾含量呈极显著负相关。

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