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| DOI：10.13522/j.cnki.ggps.20180277 |
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| The Growth of Melilotus and Salt Leaching in Salt-affected Soil under Drip Fertigation |
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ZHANG Yongkang，LIU Shuhui，LU Yangjie，WANG Bin，HUANG Gaojian，WANG Yonghong
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1.College of Water Resources Science and Engineering，Taiyuan University of Technology， Taiyuan 030024, China；2.Institute of Agricultural Environment and Resources, Shanxi Academy of Agricultural Sciences，Taiyuan 030031, China；3.Shanxi Institute of Water Resources and Hydropower Sciences， Taiyuan 037002, China）
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| Abstract: |
| 【Objective】 Crop growth and solute dynamics in soil are controlled by irrigation, and the purpose of this paper is to elucidate the movement of salt and melilotus growth in a salt-affected soil under drip fertigation. 【Method】The experiment was conducted in Datong Basin in Shanxi province under different fertilization levels. The control was traditional fertilization used by local farmer with N∶P∶K being 180∶90∶36 kg/hm2 (CK). We examined five fertilization levels, which were 0%, 40%, 70%, 100% and 130% of the fertilizers used in CK. In each treatment, we measured the changes in electrical conductivity and pH of the soil under different fertilizations, as well as their effects on plant growth.【Result】When the applied fertilizer was 40% and 70% of those in CK, there was a noticeable salt leaching in the proximity of the emitter, evidenced from the increase in electrical conductivity. When the fertilizer application increased to 100% and 130% of that in CK, the electrical conductivity of the top soil showed a moderate increase. Soil pH decreased slightly after planting, and the average plant height under 70% of CK fertilization was the highest being 130.6 cm, with the associated average soil electrical conductivity being 299 μS/cm and the average pH being 7.73.【Conclusion】Fertigation at 70% of that in CK with N∶P∶K being 126∶63∶25.2 kg/hm2 reduced soil electrical conductivity and pH, thus benefiting plant growth and yield. |
| Key words: melilotus; soil salt; drip irrigation; saline-sodic soil |
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