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| DOI：10.13522/j.cnki.ggps.2020150 |
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| The Effects of Soil Amendment with Straw Biochar on Water and Salt Dynamics as Well as Water Use Efficiency of Corn under Different Irrigations |
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JIA Yonglin, QU Zhongyi, DING Yanhong, YANG Wei, MA Guiren, LI Zhengzheng
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1. Water Conservancy and Civil Engineering College, Inner Mongolia Agricultural University, Hohhot 010018, China, 2. College of Water Resources and Architectural Engineering, Northwest A＆F University, Yangling 712100, China
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| Abstract: |
| 【Background】Hetao Irrigation District is characterized by high soil salinization and low water use efficiency. Improving water use efficiency and alleviating soil salinity is essential to its sustainable development.【Objective】The objective of this paper is to investigate the efficacy of amending soil with corn-straw biochar on water and salt movement under different irrigations, as well as its consequence for crop growth and water use efficiency.【Method】The experiment was conducted in a corn field. The irrigations and biochar application were designed in the two-factor random block plots. There were three irrigations: drip irrigation with groundwater and furrow irrigation with groundwater and Yellow River water respectively, and two biochar application: 0 and 30 t/hm2. The biochar was applied to the soil surface in 2016 prior to planting followed by a mixture with the plough layer using a tiller. During the 2018 growth season, we measured soil moisture, soil salt content, corn yield, evapotranspiration and water use efficiency in all treatments.【Result】Drip irrigation with biochar amendment increased desalination by 13.3%, evapotranspiration by 10.5%, water use efficiency by 6.0%, and yield by 3.5%, compared with the same irrigation but without biochar. Furrow irrigation with the biochar amendment increased soil desalination by 5.0%, the evapotranspiration by1.3%, corn yield by 4.8%, and water use efficiency by 3.1%, compared with those without amended by the biochar.【Conclusion】Three years after its amendment with soil, the biochar was still effective in alleviating salt accumulation in the 0-100 cm soil and improving water use efficiency and yield of the corn, irrespective of the irrigation method. Comparison showed that amending soil with 30 t/hm2 of biochar coupled with film mulched drip irrigation was most effective in saving water, alleviating soil salinity and ultimately increasing yield. |
| Key words: irrigation methods; biochar; medium and long-term effects; desalination; soil moisture; corn yield |
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