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长期乳制品肥修正案促进了石灰质土壤中遗留的积累和移动性

Ruifang Hu¹, April B Leytem², Amber D Moore³

¹Department of Soil and Water Systems, University of Idaho, Moscow, Idaho, USA.

Journal of environmental quality

|April 1, 2024

概括

连续应用奶肥肥料会增加土壤 (P),引发人们对营养的可用性和潜在的漏的担忧. 肥料中的遗留P仍然存在,这表明对水质的长期风险.

科学领域:

土壤科学土壤科学
环境化学环境化学
农业学是一种农业学.

背景情况:

连续应用乳肥可以导致过度的土壤 (P) 积累,称为遗留P.
了解遗留的P动态对于管理营养的可用性和减轻P出水体至关重要.

研究的目的:

研究乳制品的长期影响与传统肥料对土壤的P分数和P出潜力.
评估在连续作物旋转下石灰质土壤中遗留P的行为.

主要方法:

在金伯利的实地研究,ID (8年肥/肥料应用,2年没有修改).
分析总P,有机/无机P,奥尔森P,特鲁格P,Ca-P矿物质和P溶解.
从地表和地下土壤样本进行测量.

主要成果:

肥料增加了总和植物可用的土壤P,特别是在前5年.
很大一部分 (54%-65%) 的-P是通过Truog测试溶解的.
肥料修饰土壤在脱落测试中显示出更高的P释放量,以及地下Olsen-P水平的升高,这表明和和泄漏潜力.
酸矿物质在肥修改的土壤中增加,即使经过2年没有变化,也持续存在.

结论:

乳制品便显著增加了土壤的P,导致遗留的P积累.
肥料的应用可以和土壤的P吸附能力,增加P出的风险.
遗留P,特别是来自酸矿物质的遗留P,代表了对环境的潜在P损失的长期来源.

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相关概念视频

The Phosphorus Cycle

The Phosphorus Cycle

Unlike carbon, water, and nitrogen, phosphorus is not present in the atmosphere as a gas. Instead, most phosphorus in the ecosystem exists as compounds, such as phosphate ions (PO43-), found in soil, water, sediment and rocks. Phosphorus is often a limiting nutrient (i.e., in short supply). Consequently, phosphorus is added to most agricultural fertilizers, which can cause environmental problems related to runoff in aquatic ecosystems.