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| DOI：10.13522/j.cnki.ggps.2017.0724 |
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| Response of Photosynthesis, Yield and Water Use Efficiency of Winter Wheat to Schedule of Border Irrigation |
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WU Baojian, WANG Dong
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College of Agronomy, Shandong Agricultural University/State Key Laboratory of Crop Biology/Key Laboratory of Crop Ecophysiology and Farming System, Ministry of Agriculture, Taian 271018, China
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| Abstract: |
| 【Objective】 This paper investigates the consequent impact of frequency and timing of border irrigation on SPAD value, photosynthetic rate of flag leaf after anthesis, yield and water use efficiency of winter wheat under different border irrigation schedules, aiming to improve use efficiency of both soil water and precipitation by the plant. 【Method】 We compared four treatments after the seedling emerged: rainfed (W0), irrigating at wintering, jointing and anthesis stage respectively (W1), irrigating at jointing and anthesis stage respectively (W2), irrigating at anthesis only (W3). 【Result】 Compared with W2, W3 reduced the SPAD, net photosynthetic rate of flag leaf after anthesis, the assimilation of dry matter and its contribution to grain, the number of spikes, grains per spike and grain yield, despite its increases in water use efficiency. In contrast, the yield and yield components in W1 were approximately the same as that in W2 in spite of its significant decrease in water use efficiency. Compared with W0, W1 increased grain yield by 16.2%~20.7%. In all treatments, the soil moisture in 0~20 cm and 0~40 cm soil was more than 65% and 66.8% of the field capacity respectively at wintering stage, and thus irrigation at this stage had no significant effect on wheat grain yield. Root uptake and evaporation reduced the moisture in 0~20 cm soil quickly to 50.6% of the field capacity event though the soil moisture in 0~200 cm was close to 80% of the field capacity. Therefore, irrigation was required to replenish the water lost via evapotranspiration. When soil water content in 0~20 cm and 0~200 cm soil at the anthesis stage was 24.8%~35.6% and 57.9%~58.8% of the field capacity respectively, timely irrigation could greatly increase the yield. 【Conclusion】 Irrigation at jointing and anthesis stage can improve both grain yield and water use efficiency. |
| Key words: winter wheat; border irrigation; irrigation stage; photosynthetic characteristics; yield; water use efficiency |
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