数字农科院2.0

Reclamation of heavy coastal silt saline soil and optimal tomato production through a drip irrigation system with saline water

文献类型： 外文期刊

作者： Feng, Di;Sun, Chitao;Li, Xiaobin;Sun, Xiaoan;Wan, Shuqin;Li, Caixia;Ning, Songrui

作者机构：

关键词： Irrigation water salinity;Ridge tillage;Tomato growth;Survival rate;Soil desalination rate

期刊名称： PLANT AND SOIL

ISSN： 0032-079X

年卷期： 2022 年

页码：

收录情况： SCIE（2022版）

摘要： Purpose It has always been challenged to improve heavy coastal silt saline soil for crop productions through establishing an irrigation system with saline water. This study was aimed to investigate the effect of the electricity conductivity of irrigation water (ECw) on soil salinity (ECe), sodium adsorption ratio (SAR) and pH of the saturated paste (pH(s)), tomato yield, and irrigation water use efficiency (IWUE). Methods A two-year field experiment of five ECw treatments (0.7, 3.2, 4.7, 6.2, and 7.8 dS m(-1), respectively) was conducted under ridge tillage in the Bohai Rim region, China through a drip irrigation system. Results A linear correlation between ECw and soil desalinization rate (SDR) and between the irrigated water amount and SDR was revealed and the final average ECe, SAR and pH(s) readings at 1 m deep soil (40.2 dS m(-1), 56.2 (mmol L-1)(0.5), and 7.82, respectively) dropped to those within the main root zone with each of five treatments (21.3-26.6 dS m(-1), to 32.4-37.1 (mmol L-1)(0.5) and 7.16-7.75, respectively), indicating an outstanding soil reclamation. The tomato survival rate was over 90% when the ECw was kept below 7.8 dS m(-1), while growth and yield of tomato and IWUE were generally unaffected as the ECw was below 4.7 dS m(-1). Conclusion The ECw of dripping water should be maintained below 3.9 dS m(-1) and the soil matrix potential be controlled above -5 kPa at 20 cm deep soil beneath dripping emitters for a high-yield tomato cultivation in the heavy coastal silt saline lands.

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