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Transfer functions for phosphorus and potassium soil tests and implications for the QUEFTS model
Geoderma ( IF 6.1 ) Pub Date : 2021-09-22 , DOI: 10.1016/j.geoderma.2021.115458
Mirjam S. Breure 1 , Elise Van Eynde 2 , Bas Kempen 3 , Rob N.J. Comans 2 , Ellis Hoffland 1
Affiliation  

Multi-element soil extractions such as Mehlich 3 (M3) have gained popularity in recent years, but comparing outcomes to other soil testing methods is not always straightforward. In this study, extraction mechanisms of M3, Olsen and neutral 1 M ammonium acetate (AA) soil tests were explored and transfer functions were derived between P-Olsen and P-M3 as well as between K-AA and K-M3. Soils from tropical and temperate areas were used to derive these P and K transfer functions and were evaluated separately. The application of these transfer functions for tropical soils was evaluated by using them as input for the Quantitative Evaluation of the Fertility of Tropical Soils (QUEFTS). AA and M3 generally extracted similar amounts of K, but relations between K-AA and K-M3 were different for tropical and temperate soils. For tropical soils, the transfer function did not require additional parameters besides K-M3 to predict K-AA, but for temperate soils inclusion of clay content and pH was needed. This difference between tropical and temperate soils was explained by clay mineralogy. The relation between P-Olsen and P-M3 in tropical soils was found to be dependent on pH, Al-M3, Fe-M3 and Ca-M3. P-Olsen and K-AA values, calculated with their respective transfer functions, were used as input for QUEFTS. The yields predicted with measured P-Olsen and Exch. K were used as benchmark. For 63 out of 81 soil samples, predicted maize yields with transfer functions deviated less than 10% from the benchmark. The largest deviations from the benchmark were found for low P-Olsen and K-AA values, which corresponds to QUEFTS maize yield predictions up to 3000 kg ha−1. We conclude that a M3 extraction results and soil pH can reliably be transferred to, and thus replace P-Olsen and K-AA determinations with the functions developed for tropical soils. The transfer functions can be used to generate input for the QUEFTS model with minor effects on yield predictions, thus expanding its applicability in cases where only M3 extraction results are available.



中文翻译:

磷和钾土壤测试的传递函数以及对 QUEFTS 模型的影响

近年来,多元素土壤提取,如 Mehlich 3 (M3) 越来越受欢迎,但将结果与其他土壤测试方法进行比较并不总是那么简单。本研究探索了 M3、Olsen 和中性 1 M 醋酸铵 (AA) 土壤测试的提取机制,并推导出 P-Olsen 和 P-M3 之间以及 K-AA 和 K-M3 之间的传递函数。来自热带和温带地区的土壤用于推导这些 P 和 K 传递函数,并分别进行评估。这些传递函数在热带土壤中的应用是通过将它们用作热带土壤肥力定量评估 (QUEFTS) 的输入来评估的。AA 和 M3 通常提取的 K 量相似,但对于热带和温带土壤,K-AA 和 K-M3 之间的关系不同。对于热带土壤,除了 K-M3 之外,传递函数不需要额外的参数来预测 K-AA,但对于温带土壤,需要包含粘土含量和 pH 值。粘土矿物学解释了热带和温带土壤之间的这种差异。发现热带土壤中 P-Olsen 和 P-M3 之间的关系取决于 pH、Al-M3、Fe-M3 和 Ca-M3。P-Olsen 和 K-AA 值,用它们各自的传递函数计算,用作 QUEFTS 的输入。用测量的 P-Olsen 和 Exch 预测的产量。K被用作基准。对于 81 个土壤样品中的 63 个,具有传递函数的预测玉米产量与基准的偏差小于 10%。与基准的最大偏差出现在低 P-Olsen 和 K-AA 值时,这对应于 QUEFTS 玉米产量预测高达 3000 kg ha-1。我们得出结论,M3 提取结果和土壤 pH 值可以可靠地转移到,从而用为热带土壤开发的功能取代 P-Olsen 和 K-AA 测定。传递函数可用于为 QUEFTS 模型生成对产量预测影响较小的输入,从而在只有 M3 提取结果可用的情况下扩展其适用性。

更新日期:2021-09-23
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