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首页> 外文期刊>South African Journal of Plant and Soil >Response of soil organic matter indices and fractions after 37 years of wheat production management practices in semi-arid South Africa
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Response of soil organic matter indices and fractions after 37 years of wheat production management practices in semi-arid South Africa

机译：半干旱南非37年麦类生产管理实践后土壤有机物质指数和分数的反应

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摘要

The current study evaluated the long-term response of soil organic matter (SOM) indices and fractions on wheat production management practices in the semi-arid region of South Africa. The treatments included three tillage methods (no-tillage, stubblemulch and ploughing), two residue disposal methods (no-burning and burning), and two weed control methods (chemical and mechanical). The soil samples were collected at 0-50, 50-100, 100-150, 150-250, 250-350 and 350-450 mm depth intervals to quantify total carbon (C), total nitrogen (N), C:N ratio, fulvic acid (CFA) humic acid, (CHA) and CHA:CFA ratio. Tillage methods significantly increased total C, CFA and CHA in the majority of the soil layers as compared to total N and C:N ratio. Residue disposal methods had few significant differences in total C, total N and C:N ratio. Weeding methods and treatment interactions had no significant difference in SOM indices and fractions. The results suggest that SOM of this semi-arid region, could be improved by tillage practices that encourage accumulation of crop residues rather than using mouldboard ploughing. Even though the grain yield was not affected by management practices, if the aim is towards the sustainable use of soil, soil quality should be prioritized more than the grain yield.
机译：目前的研究评估了南非半干旱地区的土壤有机物质（SOM）指数和分数的长期响应。该治疗包括三种耕种方法（无耕作，顽固和耕作），两种残留物处理方法（无燃烧和燃烧），以及两种杂草控制方法（化学和机械）。在0-50,50-100,100-150,150-250,250-350和350-450mm的深度间隔中收集土壤样品，以定量总碳（c），总氮（n），c：n比，富甲酸（CFA）腐殖酸，（CHA）和CHA：CFA比率。与总N和C：n比相比，耕作方法在大多数土壤层中显着增加C，CFA和CHA。残留物处理方法的总C，总N和C：N比例差异很小。除草方法和治疗相互作用在SOM指数和分数中没有显着差异。结果表明，这一半干旱地区的SOM可以通过耕作实践来改善，鼓励作物残留的积累而不是使用薄片耕作。尽管粮食产量不受管理措施的影响，但旨在朝着可持续使用土壤，土壤质量应优先于粮食产量。

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