不同光质配比对水培牧草大麦生长的影响

Effects of Different Light Quality Ratios on the Growth of Hydroponic Forage Barley

【目的】研究不同红蓝光配比对水培大麦生长的影响,分析合适的光质。【方法】以水培牧草大麦为研究对象,分别用LED白光、LED蓝光及LED红蓝光配合进行处理,测定一个生长周期下大麦的株高、根长、鲜草产量、干草产量。【结果】不同光照条件下,大麦的生长表现出显著差异。在白光照射条件下,大麦株高为8.92 cm,显著高于其他2个处理。蓝光处理的大麦株高最低,为6.62 cm,显著低于其他两个处理;蓝光照射下,大麦的根长最长,为10.42 cm,显著高于其他两个处理。蓝光和红蓝光配合处理间的鲜草、干草生物量差异不显著,显著高于白光处理的生物量。【结论】人工光水培条件下,LED白光促进大麦植株上部分茎的伸长,株高增大,而鲜重和干重及下部分的根系生长受抑制。LED蓝光可促进大麦下部分根的生长发育和生物量的累积,株高伸长受限。红蓝光LED组合处理可促进大麦生物量的增加,是水培方式下培育大麦牧草采用的光质。

【Objective】To study the effects of different red and blue light ratios on the growth of hydroponic barley and determine the appropriate photoplasm.【Methods】Hydroponic forage barley was taken as the research object,the plant height,root length,fresh grass yield and dry grass yield of barley in one growth cycle were measured by LED white light,LED blue light and LED red blue light.【Result】The results showed that there were significant differences in the growth of barley under different light conditions.Under the condition of white light,the plant height of barley was 8.92 cm,which was significantly higher than those of the other two treatments.The plant height of blue light treatment was the lowest,6.62 cm,which was significantly lower than those of the other two treatments;the root length of blue light treatment was the longest,10.42cm,which was significantly higher than those of the other two treatments.There was no significant difference in the biomass of fresh grass and hay between blue light and red blue light,which was significantly higher than that of white light.【Conclusion】Under the condition of artificial light hydroponics,LED white light promotes the stem elongation and plant height of the upper part of barley plant,while the fresh weight,dry weight and root growth of the lower part are inhibited.Led blue light can promote the growth and biomass accumulation of barley roots,but plant height elongation is limited.The combination of red and blue LED can promote the increase of barley biomass,which is the recommended light quality for hydroponic cultivation of barley forage.