| Cite this article: | 刘然,周伟伟,金圣爱,等.新型灌溉模式下测墒补灌对农田水氮及小麦产量的影响[J].灌溉排水学报,0,():-. |
| LIU Ran,ZHOU Weiwei,JIN Shengai,et al.新型灌溉模式下测墒补灌对农田水氮及小麦产量的影响[J].灌溉排水学报,0,():-. |
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| Effects of Soil Moisture Measurement and Supplemental Irrigation on Farmland Water, Nitrogen and Wheat Yield Under New Irrigation Mode |
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LIU Ran, ZHOU Weiwei, JIN Shengai, SHANG Meixin, WANG Meng, LI Junliang
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College of Resources and Environment,Qingdao Agricultural University
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| Abstract: |
| 【Background】In order to solve the problem of water resources waste caused by unreasonable irrigation, water-saving irrigation for wheat was studied.【Method】Lumai 21 was selected for field experiment in 2020. The split plot design with two factors was adopted- the irrigation amount was the main area and the soil moisture was measured at jointing stage and flowering stage to supplement irrigation to three levels of 65% (W65), 75% (W75) and 85% (W85) of field water capacity. The irrigation mode was the sub area with three modes: drip irrigation (D), micro sprinkler irrigation (WP) and micro sprinkler irrigation at jointing stage and drip irrigation at flowering stage (WP+D). The effects of various treatments on soil water and nitrogen distribution, wheat yield, water use efficiency and economic benefits were studied.【Result】The results show that the irrigation below the field capacity only affectes the 0-40cm soil layer, and the water content of 40-100 cm soil layer do not fluctuate during the whole growth period of wheat after irrigation, that is, 0-40 cm is the main water supply layer and water holding layer, and the soil water content is W85>W75>W65. Nitrate nitrogen content in 0-60cm soil layer is higher under W65, W75 irrigation volume and micro sprinkler irrigation mode, and the risk of nitrate nitrogen leaching increases with the increasing of irrigation volume. At the mature stage, the irrigation amount, irrigation mode and their interaction have a significant impact on the 40-100 cm soil layer. With the increase of irrigation amount, both the yield and water use efficiency show a trend of first increasing and then decreasing. Under the mode of micro sprinkler irrigation at jointing stage combined with drip irrigation at flowering stage, better water-saving and yield assurance can be achieved, with the yield of 6147.5 kg/hm2, water use efficiency of 16.2 kg/(hm2.mm), and higher economic benefit of 8429.0元/hm2.【Conclusion】In general, the goal of water saving and environmental protection for wheat production can be achieved by measuring soil moisture and supplementing irrigation to 75% of the field capacity at jointing and flowering stages and combining micro sprinkler irrigation with drip irrigation. |
| Key words: soil moisture measurement and supplementary irrigation; irrigation mode; wheat yield; water use efficiency; economic benefits |
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