不同人工补光光源对早春西瓜嫁接苗生长的影响

在早春持续低温阴雨寡日照的天气下,以甬砧5号嫁接的拿比特西瓜嫁接苗为试验材料,利用LED灯、高压钠灯于心叶刚长出时进行连续25d的补光,以自然光照为对照。结果表明,人工补光能明显促进西瓜嫁接苗的生长,补光17d起,采用LED灯和高压钠灯处理的砧木下胚轴长度和接穗下胚轴长度快速提高,嫁接苗整体株高增长显著,且叶面积增大,砧木和接穗茎粗增粗,嫁接苗生物量积累加快,接穗真叶叶绿素含量提高,叶片光合能力增加,嫁接苗成活率提高,苗期猝倒病等发病率降低。不同光源比较,LED灯的效果优于高压钠灯,且长期运行的投入成本和使用成本也更低,是今后农业领域最有前途的人工补光光源之一。

Effects of Different Artificial Supplement Light Sources on Grafted Watermelon Seedling Growth in Early Spring

In early spring，under successive cold，rainy and cloudy climate condition，this experiment took ‘Nabite’ scions grafted onto‘ Yongzhen No.5’ as material，and exposed them under LED light and high voltage sodium lamp for supplementary light of continuous 25 days，taking natural light as the contrast. The results showed that artificial supplement light could obviously accelerate the growth of grafted watermelon seedlings. After the 17th day under supplementary light，the artificial supplement light treatments had great impact on the growth of seedlings：the hypocotyl lengths of rootstock and scion were rapidly increased，the plant height was remarkably enlarged，leaf areas became bigger，stems became thicker，biomass accumulation was fastened，chlorophyll content was improved，photosynthetic capacity of leaf blades was strengthened，survival rate of grafted seedlings was improved，diseases occurrence rate was reduced. Compared with different light resources，the effect of LED light is better than that of high voltage sodium lamp. Moreover，LED light has lower input and usage cost in long time running. LED light might become one of the most promising artificial supplementary lights in agriculture field in the future.