Soil acidification, as influenced by N-fertilizer, stubble management and crop rotations, was investigated using soil samples from a long-term rotation trial at Tarlee, South Australia.

用南澳大利亚Tarlee地区一个长期田间试验的土壤样品研究了轮作措施、氮肥施用和残茬管理对土壤酸化的影响。

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The paper analyzes the effect of rotation and fertilization on alfalfa productivity on the Loess Plateau based on a long-term experiment.

在长期定位试验的基础上，分析黄土高原地区轮作与施肥对苜蓿生产力的影响。

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Conclusion it is in accordance with biomechanics to treat medial knee degenerative arthritis and patellofemoral arthritis due to tibial rotation, which has satisfactory long term result.

结论胫骨高位截骨、胫骨结节旋转抬高治疗膝关节内侧间隔退行性关节炎、胫骨旋转所致髌股关节炎，符合生物力学要求，长期随访效果满意。

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The defence ministry says that to sustain a long-term operation, with a proper rotation system, it ideally likes to have at its disposal three or four ships or aircraft, and up to five army units, for every one deployed at any given time.

ECONOMIST: The army