| Improvement of Na2SO4 saline soil by Melilotus Mill and desulfurization gypsum in Hetao Inner Mongolia |
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| DOI：10.7606/j.issn.1000-7601.2016.01.13 |
| Key Words: Melilotus Mill desulfurization gypsum Na2SO4 saline soil Hetao Inner Mongolia |
| Author Name | Affiliation | | WEN Guo-chang | College of Resources and Environmental Sciences, China Agricultural University, Beijing 100193, China | | XU Yan-hu | College of Resources and Environmental Sciences, China Agricultural University, Beijing 100193, China | | LIN Qi-mei | College of Resources and Environmental Sciences, China Agricultural University, Beijing 100193, China | | LI Gui-tong | College of Resources and Environmental Sciences, China Agricultural University, Beijing 100193, China | | ZHAO Xiao-rong | College of Resources and Environmental Sciences, China Agricultural University, Beijing 100193, China |
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| Abstract: |
| To investigate the improvement results from both Melilotus Mill and desulfurization gypsum (30 t·hm-2) on salt contents and properties, a field experiment was set up in the Na2SO4 saline soil at Hetao Inner Mongolia. The results showed that the irrigation in spring largely reduced the pH and salinization level. In particular, the values of pH and EC in surface soil were reduced by 1.54～2.07 and 7%～69% respectively. The concentrations of main salt ions Na+ and SO42- became decreased by 80% and 39%, respectively. Addition of desulfurization gypsum had no significant effect on salt washing, but reduced soil organic matter, available P and K by 20%, 15% and 50%, respectively, implying that addition of desulfurization gypsum enhanced nutrient leaching during irrigation washing. The amendment of desulfurization gypsum resulted in 34% increase of Melilotus Mill biomass. However, the P content in plant tissue was significantly reduced by 42%. Melilotus Mill largely reduced soil EC and ion contents. The concentrations of main ions of Na+ and SO42- in the surface soil were decreased from 670 mg·kg-1 to 3.38 mg·kg-1, and from 2 500 mg·kg-1 to 140.80 mg·kg-1, respectively, which was about 200 times and 16 times lower than those in the soil before cultivation. The contents of both soil organic matter and alkaline-released N were elevated by 6% and 40% respectively. In contrary, available P and K went decreased by 49% and 26%, respectively. Though addition of Melilotus Mill had not significant impacts on soil pH, EC and salt ion concentration, it significantly lifted soil organic matter, alkaline-released N, available P and K. It was thus concluded that Melilotus Mill had a marked function in improving saline soil. There was also synergistic effect between Melilotus Milland desulfurization gypsum. To maintain available P and K nutrients levels in soil, additional PK fertilizers might be needed. |
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