Comparison of agri-environmental phosphorus tests for boreal agricultural and natural Podzols

IF 1.5 4区 农林科学 Q4 SOIL SCIENCE
A. J. Kedir, D. B. McKenzie, N. Ziadi, Adrian Unc
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引用次数: 1

Abstract

Abstract Over a dozen soil phosphorus (P) extraction procedures have been designed for agri-environmental purposes (P-tests). Sustainable expansion of agriculture into boreal regions dominated by Podzols requires further insights into P extractability. We extracted P from Podzol samples (n = 96) using nine P-tests followed by both colorimetric (PCol) and inductively coupled plasma (PICP) quantifications and assessed the relationships between P-tests. Samples were collected by depth or horizon from agricultural fields and reference sites in eastern, central, and western Newfoundland, Canada. The soil P was extracted with water, citric acid, ammonium bicarbonate diethylenetriaminepentaacetic acid (AB-DTPA), Morgan, Olsen, Bray-1, Bray-2, Mehlich-1, and Mehlich-3 solutions, thus targeting a wide range of extractable P pools in managed and natural Podzols. The soils had a pH of 3.4–6.9, organic matter of 0.5%–47.2%, and Al-M3 of 977–2561 mg kg−1. On average, water extracted the lowest PCol (1.0) and PICP (5.7) mg kg−1, while citric acid extracted the highest PCol (151) and PICP (290) mg kg−1. For the managed podzolic soils, the extractability of P followed the sequence water < Morgan < AB-DTPA < Mehlich-1 < Bray-1 < Mehlich-3 ≤ Olsen ≤ Bray-2 < citric acid; this varied slightly by quantification techniques and soil groups. The differences between PICP and PCol were most significant for the citric acid extracts. Most P-tests measurements were moderately to strongly correlated to P-M3ICP measurements (r2 > 0.50) but variable with quantification techniques and soil depths. Given the diversity in extractable P pools across management-induced soil conditions, it is evident that a fully informed P management for the Newfoundland Podzols will require calibration of P-tests against crop P uptake.
北方农业和天然波德唑的农业环境磷试验比较
摘要:为了农业环境目的,已经设计了十几种土壤磷(P)提取方法(P检验)。农业在北方地区的可持续扩张以豆荚为主导,需要进一步了解磷的可提取性。我们从Podzol样品(n = 96)中提取P,采用9项P检验,随后采用比色法(PCol)和电感耦合等离子体法(PICP)定量,并评估P检验之间的关系。样品从加拿大纽芬兰东部、中部和西部的农田和参考地点按深度或水平采集。采用水、柠檬酸、碳酸氢铵二乙基三胺五乙酸(AB-DTPA)、Morgan、Olsen、Bray-1、Bray-2、Mehlich-1和Mehlich-3溶液提取土壤磷,从而针对管理和天然灰化土中广泛的可提取磷库。土壤pH值为3.4 ~ 6.9,有机质含量为0.5% ~ 47.2%,Al-M3为977 ~ 2561 mg kg−1。平均而言,水提取最低的PCol(1.0)和PICP (5.7) mg kg - 1,而柠檬酸提取最高的PCol(151)和PICP (290) mg kg - 1。灰化土对磷的可提取性依次为:水< Morgan < AB-DTPA < Mehlich-1 < Bray-1 < Mehlich-3≤Olsen≤Bray-2 <柠檬酸;这因量化技术和土壤类型而略有不同。柠檬酸提取物的PICP和PCol差异最为显著。大多数p -试验测量值与P-M3ICP测量值具有中等到强烈的相关性(r2 > 0.50),但随定量技术和土壤深度而变化。考虑到不同土壤条件下可提取磷库的多样性,很明显,对纽芬兰Podzols进行全面的磷管理将需要针对作物磷吸收进行磷测试校准。
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来源期刊
Canadian Journal of Soil Science
Canadian Journal of Soil Science 农林科学-土壤科学
CiteScore
2.90
自引率
11.80%
发文量
73
审稿时长
6.0 months
期刊介绍: The Canadian Journal of Soil Science is an international peer-reviewed journal published in cooperation with the Canadian Society of Soil Science. The journal publishes original research on the use, management, structure and development of soils and draws from the disciplines of soil science, agrometeorology, ecology, agricultural engineering, environmental science, hydrology, forestry, geology, geography and climatology. Research is published in a number of topic sections including: agrometeorology; ecology, biological processes and plant interactions; composition and chemical processes; physical processes and interfaces; genesis, landscape processes and relationships; contamination and environmental stewardship; and management for agricultural, forestry and urban uses.
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