调亏灌溉对玉米农艺性状及干物质积累的影响

Influences of regulated deficit irrigation(RDI)on agronomic traits and dry matter accumulation of maize

以玉米品种中单808为材料,通过盆栽试验,研究不同调亏叶龄、调亏程度和调亏时间对玉米农艺性状及干物质积累的影响。结果表明：在不同叶龄期对中单808进行调亏灌溉,复水10 d时展四叶和展五叶的株高、茎粗及单株叶面积均较大,到了大喇叭口期和抽雄吐丝期展三叶和展四叶显著高于展五叶处理;调亏程度为55%~65%的株高、茎粗及单株叶面积均显著高于调亏程度为40%~50%的处理;持续12 d的调亏灌溉有助于玉米株高、茎粗、叶面积的生长;植株各部位和整株干物重均以展4叶期＋调亏程度55%~65%＋调亏持续12 d的处理最大。因此,中单808在展4叶期进行为期12 d的调亏程度为55%~65%（土壤水分占田间最大持水量的55%~65%）的调亏灌溉组合效应较好。

Taking Zhongdan808 as material, by pot experiment, this paper studied the effects of different regulated deficit irrigation（RDI） leaf age, RDI degree, RDI time on agronomic traits and dry matter accumulation of maize. Results showed that at different leaf age with RDI, plant height, stem diameter and leaf area per plant in four leaf age and five leaf age were bigger than those in three leaf age after 10 days re-watering, these traits in three leaf age and four leaf age were significantly higher than those in five leaf age at huge bell stage and spinning tasseling stage. Plant height, stem diameter, leaf area per plant by RDI at 55%-65% were significantly higher than those by RDI at 40%-50%. Lasting 12 days of RDI developed the growth of maize plant height, stem diameter and leaf area. Dry matter weight of each part and whole plant both were the largest in the combination of 4 leaf stage, RDI at 55%-65% and RDI for 12 days processing. Therefore, Zhongdan 808 grew well in the combination of 4 leaf stage, RDI at 55%-65% and RDI for 12 days processing.