在美国中西部上部的长期农业生态系统研究地点,密集管理的排列作物的预算
Mir Zaman Hussain1,2, Stephen K Hamilton1,2,3,4, Bruno Basso1,2,5
1W. K. Kellogg Biological Station, Michigan State University, Hickory Corners, Michigan, USA.
Journal of environmental quality
|February 12, 2025
概括
预算显示,有机系统需要P补充,而受精系统会积累多余的土壤. 量身定制的管理对于作物产量和环境保护至关重要.
科学领域:
- 农业科学 农业科学
- 土壤科学 土壤科学
- 环境科学 环境科学
背景情况:
- (P) 管理对于可持续的作物生产和环境健康至关重要.
- 了解P预算有助于优化土壤的P水平并最大限度地减少损失.
- 根据管理实践,作物系统在P动态上有所不同.
研究的目的:
- 在玉米-大豆-小麦轮换中,量化12年的输入和输出.
- 在传统,无耕种,减少投入和有机管理系统中比较P预算.
- 评估不同管理系统对土壤测试 (STP) 和潜在环境风险的影响.
主要方法:
- 量化P输入 (肥料,大气沉积) 和输出 (收获,水).
- 在四个管理系统下,在复制的作物旋转中监测P流.
- 在12年的时间里,测量了土壤试验 (STP) 和溶解在液中的P.
主要成果:
- 在受精系统中,受精和收获是主导的P流;在有机系统中,只有收获.
- 漂水损失很小,但漂水P度接近了对缩的担忧水平.
- 有机系统具有负的P平衡 (-82.0公斤P ha-1) 和低于最佳的STP;受精系统具有高STP的正平衡 (平均70.1公斤P ha-1).
结论:
- 有机系统需要P补充来保持土壤肥力和作物生产率.
- 受精系统显示P积累,表明过度应用的可能性.
- 定制的P管理策略对于平衡作物需求和环境保护至关重要.
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