| Effect of regulated deficit irrigation on growth relation of root to shoot in summer maize |
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| DOI：10.7606/j.issn.1000-7601.2018.05.25 |
| Key Words: maize regulated deficit irrigation growth of root and shoot ratio of root to shoot compensatory effect |
| Author Name | Affiliation | | LI Biao | Farmland Irrigation Research Institute, Chinese Academy of Agricultural Sciences, Xinxiang, Henan 453002, China
Key and Open Laboratory of Crop Water Requirements Regulation, Ministry of Agriculture, Xinxiang, Henan 453002, China | | MENG Zhao-jiang | Farmland Irrigation Research Institute, Chinese Academy of Agricultural Sciences, Xinxiang, Henan 453002, China
Key and Open Laboratory of Crop Water Requirements Regulation, Ministry of Agriculture, Xinxiang, Henan 453002, China | | DUAN Ai-wang | Farmland Irrigation Research Institute, Chinese Academy of Agricultural Sciences, Xinxiang, Henan 453002, China
Key and Open Laboratory of Crop Water Requirements Regulation, Ministry of Agriculture, Xinxiang, Henan 453002, China | | LIU Zu-gui | Farmland Irrigation Research Institute, Chinese Academy of Agricultural Sciences, Xinxiang, Henan 453002, China
Key and Open Laboratory of Crop Water Requirements Regulation, Ministry of Agriculture, Xinxiang, Henan 453002, China | | LIU Xiao-fei | Farmland Irrigation Research Institute, Chinese Academy of Agricultural Sciences, Xinxiang, Henan 453002, China
Key and Open Laboratory of Crop Water Requirements Regulation, Ministry of Agriculture, Xinxiang, Henan 453002, China | | SHEN Xiao-jun | Farmland Irrigation Research Institute, Chinese Academy of Agricultural Sciences, Xinxiang, Henan 453002, China
Key and Open Laboratory of Crop Water Requirements Regulation, Ministry of Agriculture, Xinxiang, Henan 453002, China | | CHANG Xiao | Farmland Irrigation Research Institute, Chinese Academy of Agricultural Sciences, Xinxiang, Henan 453002, China
Key and Open Laboratory of Crop Water Requirements Regulation, Ministry of Agriculture, Xinxiang, Henan 453002, China |
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| Abstract: |
| The effects of different deficit irrigation strategies on such morphological parameters as root and shoot in pot-grown maize (zea may L. cv.) plants were experimentally investigated in different growth phases during the growing seasons of 2013 and 2014 under rain-proof shelter condition in Huang-huai-hai Plain in China to evaluate how such strategies could be safely used and offered theories basis for the establishment of Regulated Deficit Irrigation(RDI) model for water-saving, high-yield, high quality and efficiency in crops. A two-factor randomize-block design was applied. The first factor was different stages of water deficit, including three leaves-stem elongation stage (I), stem elongation-ear emergence stage (II), ear emergence-filling stage (III), and filling-maturing stage (IV). The other factor was different degree of water deficit with three levels by soil relative water content, which included light deficit (L), moderate deficit (M) and severe deficit (S) at stages of water deficit I to IV, corresponding soil relative water content were 60%~65% FC (Field Capacity), 50%~55% FC and 40%~45% FC, respectively. Totally, 12 water deficit treatments with six replicates were designed and applied. Additionally, an appropriate irrigation treatment (75%~80%FC) during whole growing season with twenty-four replicates was designed as control (CK). Such morphological parameters as root dry weight, root weight density and root length density, plant height, leaves area, ear characters and total shoot dry matter weight were measured synchronously in all water treatments during water stress period and after re-watering, respectively. The results indicated that there were differences in effects of RDI on growth of roots and shoots in maize plants due to both phenological stages and degree of water deficit. A moderate water deficit (50%~55%FC) applied at stem elongation-ear emergence phases reduced significantly plant height, promoted plants to grow robustly and prevented plants from late lodging and increased yield. There were a positive effect on root growth and an effect on delaying senescence of root system in water deficit period at middle or later phases in maize plants growth, which reflected that the adaptability of root systems to water deficit was stronger at later stage than that at early stage. The influence of water status on the ratio of root to shoot (R/S) was the maximal at three leaves-stem elongation stages and the least at filling stage. Water deficit applied at stem elongation-ear emergence stages increased significantly R/S. The matter distribution between the root systems and shoots was balance after re-watering, and a appropriate value of R/S was retained, which indicated that stem elongation-ear emergence stages was a suitable phase to regulate R/S by using RDI. Water deficit applied at three leaves-stem elongation stages improved ear characters in maize, which indicated an appropriate water deficit at vegetative growth phases benefited for promoting reproductive growth. It is believed that RDI can effectively coordinate the relation of root to shoot and then increase grain yield in maize. |
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