| Cite this article: | 李彦彬,卢争光.连旱对夏玉米叶绿素荧光特性、产量和水分利用效率的影响[J].灌溉排水学报,2022,():-. |
| li yanbin,lu zhengguang.连旱对夏玉米叶绿素荧光特性、产量和水分利用效率的影响[J].灌溉排水学报,2022,():-. |
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| Effects of continuous drought on chlorophyll fluorescence characteristics, yield and water use efficiency of Summer Maize |
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li yanbin, lu zhengguang
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North China University of Water Resources and Electric Power
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| Abstract: |
| 【Objective】 to study the effects of continuous drought stress on chlorophyll fluorescence characteristics, yield and water use efficiency (WUE) of summer maize, so as to provide theoretical guidance for drought resistance and stable yield of summer maize. 【Method】 “DHA757” was selected as the test material. Different degrees of drought treatments were set up in jointing-stage, tasseling stage and filling stage (expressed by B, C and G respectively), namely Normal, Light, Medium and Heavy drought (expressed by CK, 1, 2 and 3 respectively), Corresponding to (70%, 80%], (60%, 70%], (50%, 60%] and (40%, 50%] of field capacity (FC), water was controlled by bucket Planting under mobile rainproof shed. A total of 9 treatments were set up, including 2 single droughts in jointing-stage, 3 consecutive droughts in two-stage (jointing-tasseling stage), 3 consecutive droughts in three-stage (jointing-tasseling-filling stage) and 1 control. In each treatment, we measured water consumption, Fv/Fm, Fv/Fo, yield and WUE of summer maize. 【Result】 Compared with CK, continuous drought stress treatments decreased water consumption, SPAD, Fv/Fm and Fv/Fo of summer maize significantly, and the decrease increased with the aggravation of drought. Different drought treatments all can reduce the yield of summer maize. Under the single drought treatment at jointing-stage, the yield reduction of B3 was the most obvious, followed by B2; Under two-stage continuous drought and three-stage continuous drought treatments, the yield reduction of Light drought treatment was not obvious, and other treatments would lead to a significant reduction in yield. WUE increased by 5.1%, 2.8% and 6.3% compared with CK under B2, B1C1 andB2C2 treatments, respectively, indicating that a lower degree of drought is helpful to the improvement of WUE. 【Conclusion】 Combined with yield and WUE, when water resources are scarce, Medium drought in jointing-stage (50%~60%FC) and two-stage of continuous (jointing-tasseling stage) Light drought from (60%~70%FC) are suitable choices for saving water and ensuring food production. |
| Key words: continuous drought; summer maize; chlorophyll fluorescence characteristics; yield; water use efficiency |
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