Traditionally, locally calibrated soil tests were used for fertilizer and lime recommendations. Farmers and advisors are increasingly using new ‘universal’ soil tests without local calibration. The objective of this study was to compare five commercially available soil tests and to determine whether they would provide similar recommendations. In total, 24 fields in Western Finland were sampled for 4 years while being treated with fertilizers, lime and manure. The soil samples were analysed with Mehlich-3, ammonium acetate, H3A, hydrochloric acid and mild acetic acid (Spurway) extractants. In addition, Soil Health Tool (CO₂ burst, water-soluble C and N) and tissue testing were conducted. The different tests extracted different orders of magnitude of nutrients (especially P and Mg), but the results from the different extractions were correlated. Mehlich-3 degree of phosphorus saturation (DPS) presented a threshold, below which soluble phosphorus was not detected. Similar thresholds were found for P, S and Mg. Mehlich-3 and ammonium acetate provided similar results for Ca, Mg and K and can be used interchangeably for liming recommendations. Mehlich-3 identified more fields with Zn, Cu, B and S deficiencies and less fields with Mn deficiencies compared with ammonium acetate + EDTA and tissue testing. The tests had strong correlation, but the determination of nutrient deficiencies needs local calibration of deficiency limits.

中文翻译：

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不同的农艺土壤测试是否可以识别出相似的营养缺乏？

传统上，当地校准的土壤测试用于肥料和石灰推荐。农民和顾问越来越多地使用新的“通用”土壤测试，而无需本地校准。本研究的目的是比较五种商用土壤测试，并确定它们是否会提供类似的建议。总共对芬兰西部的 24 个田地进行了为期 4 年的采样，同时用化肥、石灰和粪肥处理。土壤样品用 Mehlich-3、乙酸铵、H3A、盐酸和温和的乙酸 (Spurway) 萃取剂进行分析。此外，土壤健康工具（CO ₂进行了爆裂、水溶性 C 和 N) 和组织测试。不同的测试提取了不同数量级的营养物质（尤其是 P 和 Mg），但不同提取物的结果是相关的。Mehlich-3 磷饱和度 (DPS) 提出了一个阈值，低于该阈值时未检测到可溶性磷。P、S 和 Mg 也发现了类似的阈值。Mehlich-3 和乙酸铵对 Ca、Mg 和 K 提供了相似的结果，并且可以互换用于石灰推荐。与醋酸铵 + EDTA 和组织测试相比，Mehlich-3 确定了更多缺锌、铜、B 和 S 的区域和更少的缺锰区域。这些测试具有很强的相关性，但营养缺乏的确定需要当地校准缺乏限制。