连续六年灌和化肥对的产量的影响
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Xinle Li1, Jingyuan An1, Xiangyang Hou2
1Experimental Center of Desert Forestry, Chinese Academy of Forestry, Dengkou 015200, China.
Plants (Basel, Switzerland)
|June 10, 2023
概括
在半干旱地区优化 (Medicago sativa L.) 种植需要平衡灌和 (P) 施肥. 适度灌与减少P应用可可持续地提高干物质产量.
科学领域:
- 农业科学 农业科学
- 农业学是一种农业学.
- 土壤科学 土壤科学
背景情况:
- (Medicago sativa L.) 是一个重要的料豆类为牲畜在半干旱地区,如中国北方平原.
- 通过技术进步提高子产量对于可持续的畜牧业至关重要.
- 了解灌和 (P) 施肥对产量的综合影响至关重要.
研究的目的:
- 评估不同灌和P受精水平对干物质产量 (DMY) 的影响.
- 评估P施肥对子生产率的残留影响.
- 确定最佳的水和P管理策略,以在半干旱环境中种植高产.
主要方法:
- 一个为期六年的实地实验 (2008-2013) 使用粘土沙土进行.
- 应用了四个灌水平 (每次应用0-75毫米,每年四次) 和三个P受精水平 (每次应用0-105公斤P2O5 ha-1 ,每年两次)
- 使用回归分析来确定最佳的供水,并测量DMY在不同的处理和切口.
主要成果:
- 通过适度灌 (50毫米) 和高P受精 (105公斤P2O5ha-1),实现了最高的DMY (13,961.1公斤ha-1).
- 增加灌在季前削减中显著提高了DMY,但在第四次削减中降低了DMY.
- 从第三年开始,P受精显著增加了DMY,最佳供水量估计在725-755毫米之间.
结论:
- 适度的灌与减少的年度P施肥相结合,代表了一种环境合理的方法来保持的生产力.
- 这项研究表明,P受精效应在最初几年后变得更加明显.
- 优化水和P投入是半干旱条件下可持续的高收益草种植的关键.
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