| 摘要: |
| 在陕南30余万亩冬水田中,有灌溉水源保证和自流排水条件,可以实行暗沟排水的约18万余亩。几年来的试验表明,将田间的固定性主沟修成暗沟后,其增产幅度均远高于明沟改良区和垄畦栽培区。通过定位观测,初步确定了暗沟的规格、深度和间距。改良后,土壤的结构和孔隙状况明显改善,氧化还原电位大幅度升高,有效养分供应也逐渐增强。 |
| 关键词: 冬水田,暗沟,氧化还原电位,土壤当量孔径 |
| DOI： |
| 分类号: |
| 基金项目: |
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| Effects of Underdrainage Technique on Winter Paddy Fields in Southern Shaanxi Province |
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Wei Qinfeng Wang Yiquan He Railing
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| Abstract: |
| Of 20000 ha of winter paddy fields in Southern Shaanxi,the underd rainage technique was implemented only on 12 000 ha of them with an ensured water resources and gravity drainage. Experimental results in these years showed that after the fixed open ditches were constructed into undergrainage ditches, the rice yield increasing margin was much higher than that in the improved open ditch area and ridge and furrow cultivation area. Such specifications as size, depth and spacing of underdrainage ditches were preliminarily determined through the fixed position observation. After being improved, soil structure and porous conditions were also improved signinficantly. Soil redox potential rose by a wide margin, and available nutrient were also encouraged gradually. |
| Key words: winter paddy fields, underdrainage ditch, soil redox potential, equivalent diameter of soil pore |
