氮素浓度对无土栽培一串红营养生长的影响

EFFECTS OF NITROGEN CONCENTRATION ON REGETALIVE GROWTH OF SALVIA SPLENDENS KER.—GAWL IN SOILLESS CULTURE

一串红以其生长快、株型饱满、适应性强、花期长、花色艳丽等特点,成为园林中最为普遍栽培的草本花卉。近年来无土轻质栽培基质的使用越来越受到重视。本文以一串红品种‘展望深紫’和‘一串白粉’为试材,研究了不同氮素施用量对温室珍珠岩栽培的一串红营养生长的影响。结果表明:当供氮浓度低于25 mg.L-1时,两个品种表现出典型的缺氮症状:植株叶片发黄且停止生长;当供氮浓度在200 mg.L-1时,一串红株高、冠幅、叶绿素含量及干物质重各项指标均达到最大值。而高品质的一串红要求株型饱满,因此当供氮浓度在150 mg.L-1时,一串红观赏价值最高。当供氮浓度大于200 mg.L-1时,两个品种植株的地上部和地下部生长均受到不同程度的抑制,表现出氮过量症状。

Because of its fast - growing, plump plant - type, strong adaptability, long flowering period, brightly colored, Salvia splendens become the most widely cultivated herbaceous flowers in the garden. In recent years, soilless culture substrates has been generally accepted. Different nitrogen fertilizer affect the vegetative growth of soilless culture of Salvia splendens. Vista Shenzihnd Salvia splendens. Yichuan Baifen in the greenhouse. Results show that： For nitrogen concentrations of less than 25 mg L-1, the two species showed the typical symptoms of nitrogen deficiency： leaves become yellow and plant stop growing, for the nitrogen concentration of 200 mg L-1, the plant height, crown width, chlorophyll content and dry matter weight of Salvia splendens have reached the maximum. The requirements of high - quality Salvia splendens is plump plant - type, so when the ni- trogen concentration of 150 mg L-1 was applied, itproduces the highest ornamental value. For nitrogen concentra- tion greater than 200 mg L -1 , the above - ground part and the under - ground part of two species were inhibi- ted, and show Symptoms of nitrogen excess.