求翻译：在设施条件下以不同氮素水平和形态对桔梗进行了无土栽培试验，探讨氮素对桔梗生长的影响作用规律，以期找到适合桔梗设施无土栽培的氮素水平和形态。结果表明在桔梗苗期营养液中的氮浓度为2.5mmol•l-1时更适合桔梗的生长，营养液中氮素形态为1 mmol•l-1硝态氮加4 mmol•l-1铵态氮更适合桔梗根部生长。是什么意思？

The Campanulaceae facilities under the conditions of different nitrogen levels and form a soilless culture test to explore the growth effects of nitrogen on the Campanulaceae law in order to find for Campanulaceae facilities soilless cultivation of nitrogen level and form. The results showed that th

Under the conditions in the facility in a different nitrogen levels and patterns of the Chinese Bellflower and no pilot plant for nitrogen, to explore Chinese Bellflower growth patterns, the effect in order to find a suitable Chinese Bellflower and cultivation facilities without the nitrogen levels

Has carried on the soil-free cultivation experiment under the facility condition by the different nitrogen level and the shape to the platicodon grandiflorum, the discussion nitrogen the influence function rule which grows to the platicodon grandiflorum, found by the time suits the platicodon grandi

Under the condition of facilities at different nitrogen levels and patterns on soil-free cultivation test of platycodon grandiflorum, exploring the effects of nitrogen on the growth of platycodon grandiflorum regularity, with a view to finding suitable facilities of soilless culture of platycodon gr

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