以下为句子列表：
英文: Approximately 20 million ha are presently abandoned to savanna on predominantly poor nutrient status acid soils.
中文: 到目前为止，约有2000万公顷已弃荒成为热带稀树草原，土壤酸性，养分极少。
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英文: In addition to nutritional factors, the productivity of many acid soils is affected by physical factors that include low water holding capacity （Oxisols, Spodosols） and susceptibility to crusting, erosion and especially compaction （Oxisols, Ultisols）.
中文: 除了养分因素外，许多酸性土壤的生产力受物理因素的影响，包括持水量低（氧化土，灰化土）和对结壳、侵蚀及特别是压实（氧化土、老成土）敏感。
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英文: Severe “whiptail” condition in field specimen from and acid soil. Bare midribs or very narrow residual lamina.
中文: 甘蓝缺钼“鞭尾症：在田间试验和酸性土壤上有严重的鞭尾症状，中脉突出，狭小的叶片残留。
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