| Cite this article: | 张帆,朱成立,黄明逸,等.咸淡水交替灌溉下灌水定额对土壤盐分及夏玉米生理生长指标的影响[J].灌溉排水学报,0,():-. |
| ZHANG Fan,ZHU Chengli,HUANG Mingyi,et al.咸淡水交替灌溉下灌水定额对土壤盐分及夏玉米生理生长指标的影响[J].灌溉排水学报,0,():-. |
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| Effects of Irrigation Quota on Soil Salinity and Physiological Growth Indexes of Summer Maize under Alternate Irrigation with Brackish and Fresh Water |
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ZHANG Fan, ZHU Chengli, HUANG Mingyi, CAO Leiqi, XU Yulin, ZHOU Ronghui
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Hohai University
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| Abstract: |
| 【Background】The contradiction between the supply and demand of irrigation water for agricultural production in my country is prominent. Brackish water can replace part of fresh water for farmland irrigation, but long-term use will have adverse effects on agricultural production and the environment. Therefore, how to use brackish water efficiently and safely is a problem worthy of our attention.【Objective】The purpose of this paper is to clarify the changes in soil salinity and summer maize yield under different alternative irrigation methods and irrigation quotas, in order to provide a reference for the brackish water-saving irrigation mode of maize.【Method】Taking summer maize as the research object, a rain-proof pot experiment was carried out. Four alternative irrigation methods that irrigate 3 g/L brackish water at different growth stages and fresh water at other growth stages (B0, B1, B2, and B3) and four irrigation quotas (W1: 0.6ETc; W2: 0.8ETc; W3: 1.0ETc; W4: 1.2ETc) were compared. In each treatment, we measured the soil salt content, maize physiological growth indicators and yield.【Result】(1)When the brackish water increases to 1.2ETc, the irrigation quota has a leaching effect on the soil salinity, among which the B1 treatment leaching effect is better, the average salt content of the 0~40 cm soil layer in 1.2ETc treatment is 9.9% lower than that in 1.0ETc treatment. At the end of the growth period, the B0 treatment shows desalinization, the average salt content of the 0~40 cm soil layer decreases by 25.9% to 42.6% from the initial level, and the B1, B2, and B3 treatments shows salt accumulation, and the salt content increases by 34.9%~58.5%, 73.7%~110.4% and 88.7%~128.7% from the initial level,respectively. (2)The earlier the brackish water irrigation time, the more unfavorable the effect on maize leaves. Increasing irrigation quota can reduce the impact of salt stress on treatments B2 and B3, but it aggravates the harm of salt stress in B1 treatment. Photosynthesis is severely hindered in B1 treatment, and the net photosynthetic rate (Pn) and stomatal conductance (Gs) are reduced by 40.5%~69.3% and 32.3%~68.0% respectively compared with B0 treatment.(3)In addition, the earlier the use of brackish water, the lower the root dry mass density and injury flow intensity, the more unfavorable the root growth and the greater the yield reduction. Increasing the irrigation quota can aggravate the root blockage and yield reduction of the B1 treatment, but it can improve the B2 and B3 treatments, especially for treatment B3, the yield is only reduced by 1.5%~2.0% compared with fresh water irrigation under the same irrigation quota.【Conclusion】Brackish water is not suitable for irrigation in the early stage of growth. When using brackish water for irrigation in the later growth period, an appropriate increase in the irrigation quota can reduce the risk of soil salinization while achieving high summer maize yields. |
| Key words: summer maize; brackish water; alternate irrigation;irrigation quota; salinity; yield |
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