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首页> 外文期刊>Applied and environmental soil science >N, P, and K Budgets and Changes in Selected Topsoil Nutrients over 10 Years in a Long-Term Experiment with Conventional and Organic Crop Rotations
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N, P, and K Budgets and Changes in Selected Topsoil Nutrients over 10 Years in a Long-Term Experiment with Conventional and Organic Crop Rotations

机译：在常规和有机作物轮作的长期实验中，N，P和K的预算和10年所选表层土壤养分的变化

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摘要

This study presents soil system budgets of N, P and K in six contrasting cropping systems during 10 years of a long-term experiment in southeast Norway. The experiment included systems with arable cash-cropping and with mixed arable-dairy cropping (cash- and fodder crops), with organic and conventional management represented in both groups. All major nutrient inputs and outputs were measured or estimated. State of the art conventional cash-cropping appeared to be balanced in terms of N, whereas conventional mixed cropping had an N surplus. By contrast, less up to date conventional arable cash-cropping and all the organic systems showed indications of soil organic N depletion (negative N budgets). All the organic systems showed that mining of the soil P and K content occurs, whereas the conventional systems all had P and K surpluses. The results corresponded well with measured differences between systems in terms of ignition loss, P-AL, K-AL and K-HNO3measured in 2009. This study shows that a fertile soil may be exposed to substantial mining of N, P and K over many years before it is detectable by traditional analyses, and that field nutrient budgeting is a feasible, but data-demanding, approach to detect such misbalances at an early stage.
机译：这项研究提出了在挪威东南部的一项长期实验中，在10年中氮，磷和钾在六个对比作物系统中的土壤系统预算。该实验包括具有可耕作经济作物和可混合耕种-奶牛作物（现金和饲料作物）的系统，两组均采用有机和常规管理。所有主要营养素的输入和输出均已测量或估算。现有技术水平的常规农作物似乎在氮方面保持平衡，而常规混合作物有氮过剩。相比之下，最新的常规耕作和所有有机系统都显示出土壤有机氮耗竭的迹象（负氮预算）。所有有机系统都表明发生了土壤中P和K含量的开采，而常规系统都具有P和K剩余量。结果与2009年测量的系统之间的燃烧损失，P-AL，K-AL和K-HNO3的测量差异非常吻合。这项研究表明，肥沃的土壤可能在许多地方大量开采N，P和K传统的分析方法可以检测到这种现象的发生还需要数年的时间，而田间养分预算是一种可行的方法，但是需要大量数据才能在早期发现这种失衡现象。

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