|Author:||Zhang, SuiQi ; Zhou, XiaoPing ; Mu, ZiXin ; Shan, Lun ; Liu, XiaoFang|
|Book Group Author:||NA|
In order to investigate the effects of different irrigation patterns on root growth and water use efficiency of maize and the differences among genotypes, the field and rain-out shelter experiment with different genotypes of maize (hybrid Hudan 4 and its parents 803 and Tian 4) were carried out. Results showed that hybrid maize Hudan 4 showed significant heterosis in root growth, root profile distribution and water use efficiency. The root length density of hybrid maize Hudan 4 was higher than that of its parents at shallow soil layer under full irrigation condition, but the root length density of Hudan 4 was significantly higher than that of its parents at whole soil profile under water stress conditions. Meanwhile, the root system distribution of same maize genotypes were different under different irrigation patterns. Compared with full irrigation, no irrigation at jointing stage resulted in the more root distribution at deeper soil layer, which ensured the uptake and use of deeper soil layer water for maize. Root growth produced significant compensation effect irrigated at later stage (head and filling stage), decline rate of root growth was alleviated at shallow soil layer. The water use efficiency of maize significantly increased with no irrigation at jointing stage and rewatering at head and filling stage. Therefore, optimizing root profile distribution by rational irrigation is reliable approaches to increase water use efficiency of maize under drought conditions.
|Pages:||1 - 6|
|Journal:||Transactions of the Chinese Society of Agricultural Engineering|
genotypes, growth, hybrids, irrigation systems, maize, plantwater relations, root systems, roots, spatial distribution, waterstress, water use efficiency, Zea mays, Zea, Poaceae, Cyperales,monocotyledons, angiosperms, Spermatophyta, plants, eukaryotes, corn,Field Crops (FF005) (New March 2000), Plant Breeding and Genetics(FF020), Plant Water Relations (FF062), Plant Production (FF100), SoilWater Management (Irrigation and Drainage) (JJ800) (Revised June 2002)[formerly Soil Water Management]