Comparison of soil phosphorus extraction methods regarding their suitability for organic farming systems

IF 2.6 3区农林科学 Q1 AGRONOMY

Journal of Plant Nutrition and Soil Science Pub Date : 2023-09-13 DOI:10.1002/jpln.202300129

Daniel J. Wanke, Jasmin Heichel, Sabine Zikeli, Torsten Müller, Tobias Edward Hartmann

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引用次数: 0

Abstract

Background

Organic farmers frequently report sufficient yield levels despite low or even very low soil phosphorous (P) contents questioning the applicability of widely used laboratory methods for soil P testing for organic farming.

Aims

The aim of this study was to compare the validity of a broad range of different soil extraction methods on soils under organic management from South West Germany and to test the correlation of the measured soil P concentration with plant offtake.

Methods

Twenty-two soil samples of eight different organic farms were extracted with different solutions: (1) water, (2) CAL, (3) Olsen, (4) Mehlich 3, (5) Bray P1, (6) Bray P2, (7) NaOH+Na₂EDTA, and (8) total P. The results were then correlated with above ground plant P.

Results

Spearman's rank correlation coefficient (r_s) of correlations between above ground plant P and extractable soil P (Water-P, CAL-P, and Olsen-P [+active charcoal {+AC}]) determined with ICP-OES were strong (0.94, 0.90, and 0.93, respectively). Among the tested methods, above ground plant P showed a strong correlation with CAL-P as detected by ICP-OES (r_s = 0.90) and colorimetry (r_s = 0.91). The comparison of CAL-P data provided by farmers and CAL-P analyzed during this research showed discrepancies between the results.

Conclusions

The results of this study indicate that the CAL method can be used in organic farming despite a low extraction of organic P (P_org). Furthermore, it is recommended for farmers to take soil samples for analyses regularly and interpret changes in P in the long-term instead of interpreting individual samples.

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土壤磷提取方法在有机农业系统中的适用性比较

背景有机农民经常报告说，尽管土壤磷含量很低甚至很低，但他们的产量水平足够，这对广泛使用的实验室土壤磷测试方法在有机农业中的适用性提出了质疑。本研究的目的是比较德国西南部有机管理土壤中各种不同土壤提取方法的有效性，并测试测量的土壤磷浓度与植物排放量的相关性。方法用不同的溶液提取8个不同有机农场的22个土壤样品：（1）水、（2）CAL、（3）Olsen、（4）Mehlich 3、（5）Bray P1、（6）Bray P2、（7）NaOH+Na2EDTA和（8）总P。结果ICP-OES测定的地上植物P与可提取土壤P（Water-P、CAL-P和Olsen-P[+活性炭{+AC}]）相关性的Spearman秩相关系数（rs）很强（分别为0.94、0.90和0.93）。在测试方法中，通过ICP-OES（rs=0.90）和比色法（rs=0.91）检测，地上植物P与CAL-P表现出很强的相关性。农民提供的CAL-P数据与本研究期间分析的CAL-P的比较表明，结果之间存在差异。结论本研究结果表明，尽管有机磷（Porg）的提取率较低，但CAL方法可用于有机农业。此外，建议农民定期采集土壤样本进行分析，并从长期角度解释P的变化，而不是解释单个样本。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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来源期刊

Journal of Plant Nutrition and Soil Science 农林科学-农艺学

CiteScore

4.70

自引率

8.00%

发文量

审稿时长

8-16 weeks

期刊介绍： Established in 1922, the Journal of Plant Nutrition and Soil Science (JPNSS) is an international peer-reviewed journal devoted to cover the entire spectrum of plant nutrition and soil science from different scale units, e.g. agroecosystem to natural systems. With its wide scope and focus on soil-plant interactions, JPNSS is one of the leading journals on this topic. Articles in JPNSS include reviews, high-standard original papers, and short communications and represent challenging research of international significance. The Journal of Plant Nutrition and Soil Science is one of the world’s oldest journals. You can trust in a peer-reviewed journal that has been established in the plant and soil science community for almost 100 years. Journal of Plant Nutrition and Soil Science (ISSN 1436-8730) is published in six volumes per year, by the German Societies of Plant Nutrition (DGP) and Soil Science (DBG). Furthermore, the Journal of Plant Nutrition and Soil Science (JPNSS) is a Cooperating Journal of the International Union of Soil Science (IUSS). The journal is produced by Wiley-VCH. Topical Divisions of the Journal of Plant Nutrition and Soil Science that are receiving increasing attention are: JPNSS – Topical Divisions Special timely focus in interdisciplinarity: - sustainability & critical zone science. Soil-Plant Interactions: - rhizosphere science & soil ecology - pollutant cycling & plant-soil protection - land use & climate change. Soil Science: - soil chemistry & soil physics - soil biology & biogeochemistry - soil genesis & mineralogy. Plant Nutrition: - plant nutritional physiology - nutrient dynamics & soil fertility - ecophysiological aspects of plant nutrition.