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| DOI：10.13522/j.cnki.ggps.2023176 |
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| Effects of Alternate Saline and Fresh Water Drip Irrigation on Water and Salt Dynamics and Crop Growth in Coastal Saline Soil |
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WANG Qian, DONG Shide, CUI Guangxu, MA Qian, LI Hanbo, SU Shengjia, WANG Guangmei
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1. College of Life Sciences, Ludong University, Yantai 264025, China; 2. CAS Key Laboratory of Coastal Environmental Processes and Ecological Remediation/Yantai Institute of Coastal Zone Research, Chinese Academy of Sciences/Shandong Key Laboratory of Coastal Environmental Processes, Yantai 264003, China; 3. Key Laboratory of Songliao Aquatic Environment, Ministry of Education, Jilin Jianzhu University, Changchun 130118, China; 4. Shandong Saline-alkali Land Modern Agriculture Co. Ltd., Dongying 257300, China
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| Abstract: |
| 【Objective】The aim was to study the effects of different frequency of alternating saline and fresh water drip irrigation on soil water and salt distribution and crop growth in the Yellow River Delta Region.【Method】A field experiment of alternating saline and fresh water drip irrigation for Vicia villosa(V. villosa)-maize(Zea mays L.) in two seasons was conducted. The experiment was divided into three frequency treatments of alternating saline and fresh water drip irrigation, and the corresponding irrigation frequency ratios of saline water (salinity of about 4 g/L) and fresh water (salinity of about 1 g/L) were 1∶3, 1∶1 and 3∶1(T2—T4 treatments), respectively. Additionally, a treatment of fresh water irrigation only (T1 treatment) and a treatment of saline water irrigation only (T5 treatment) were set as the control. The effects of different frequency of alternating saline drip irrigation on soil water and salt transport and maize yield in Yellow River Delta Region were explored by measuring soil EC value, crop biomass and yield during crop growth period.【Result】①Soil water dynamics was mainly controlled by irrigation in non-rainy season, and soil salinity increased significantly with the increase of saline irrigation frequency. During the rainy season, soil water dynamics were mainly affected by rainfall, and the salinity in each treatment decreased gradually. On the whole, annual salinity in the 0-20 cm soil layer was balanced. In T1—T4 treatments, the salinity in the soil layer of 20-60 cm showed a decreasing trend from the regreening stage of V. villosa to the mature stage of maize, decreased by 26.14%, 11.61%, 13.17% and 6.43%, respectively, while that in T5 treatment increased by 21.26%.②With the increase of saline irrigation frequency, the yield of fresh grass and dry matter yield decreased. There was no significant difference between T2—T4 treatments and T1 treatment, but the fresh grass yield and dry matter yield of T5 treatment were significantly reduced by 15.54% and 19.69%, respectively, compared with T1 treatment.③Maize yield increased first and then decreased with the increase of saline water irrigation frequency. Grain yield for T2 treatment was significantly higher than that of T5 treatment, but there was no significant difference between T2 and T1 treatment, as well as T3 and T4 treatments. The grain yield of T3—T5 treatments was 4.33%, 4.58% and 7.87% lower than that of T1 treatment, respectively.【Conclusion】The frequency ratio of saline and fresh water alternating drip irrigation 3∶1 (T4 treatment) can reduce the amount of fresh water irrigation, maintain the annual soil salt balance, and stabilize the biomass of the V. villosa and maize yield, which can be used as the best saline and fresh water alternating irrigation scheme for saline farmland in the Yellow River Delta Region. |
| Key words: saline water; alternate irrigation with saline and fresh water; Yellow River Delta Region; soil salinity; maize |
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