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| DOI：10.13522/j.cnki.ggps.20180346 |
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| The Resistance of Super Rice Oryza Sativa L. Nanjing 5055 to Lodging under Different Irrigation and Drainage |
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HAO Shurong, PAN Yongchun, DONG Bohao, WU Yunyu, WANG Zixin
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College of Agricultural Engineering, Hohai University, Nanjing 210098, China
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| Abstract: |
| 【Objective】This paper is to investigate the effect of different irrigation and drainage on resistance of rice, Oryza sativa L. Nanjing 5055 against lodging. 【Method】The experiments were conducted in pots and we considered four treatments: frequent shallow irrigation(FSI), wet-shallow irrigation(WSI), controlled irrigation(CI), and deficit-irrigation with straw mulching (DPS). In each treatment, we measured the morphology and mechanical properties of the rice stem, the changes in growth indexes, the photosynthetic rate of the flag leaf after the flowering stage, as well as the translocation of the stem-sheath to dry-matter (PDESS) and to the grain (PDTSS) respectively. 【Result】Compared with FSI, WSI reduced irrigation water consumption but increased the photosynthetic rate and flag leaf area after the flowering stage, beneficial to yield, despite having no significant improvement in morphology and mechanical properties of the stems. Compared with WSI, CI not only reduced the amount of irrigation water, but also improved the morphology and mechanical characteristics of the stems, thereby enhancing lodging resistance and increasing the final yield. Compared with FSI, DPS reduced the translocation from stem-sheath (PDESS) to dry-matter and the grain (PDTSS), but increased the dry-matter accumulation due to the increased water stress, leading to a decrease in lodging resistance. 【Conclusion】Considering yield, lodging resistance and irrigation water consumption, CI was the most suitable irrigation and drainage method, followed by WSI. The results presented in this paper can help design irrigation and drainage system in southern China to improve resistance of rice against lodging and safeguarding its production. |
| Key words: irrigation-drainage patterns; dry-matter accumulation; stem morphology; mechanical properties; lodging resistance |
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