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Pre-incubation Soil Handling Can Influence Comparability of Potentially Mineralizable Nitrogen Results
Communications in Soil Science and Plant Analysis ( IF 1.3 ) Pub Date : 2021-01-18 , DOI: 10.1080/00103624.2021.1872607
Sarah M. Collier 1 , Matthew D. Ruark 2
Affiliation  

ABSTRACT

Potentially mineralizable nitrogen (PMN) is a widely used indicator of a soil’s organic nitrogen (N) availability, and is often measured by incubation. While it is known that the handling of soil prior to incubation (i.e., pretreatment) may affect N mineralization during the incubation, the effect of pretreatments on the relationships in PMN between samples has not been fully evaluated. The objectives of this study were to determine the effects of refrigeration, freezing, air-drying, and soil grinding on PMN derived from a 7-day anaerobic incubation across soils of contrasting textures (silt loam and sand) and cropping histories (mixed rotation, continuous corn at varying N rates, and rotationally grazed pasture), and to assess the comparability of results across pretreatments. Analysis of variance was used to compare the individual and interaction effects of pretreatment and soil, and linear regression was performed to compare the effects of different pretreatments relative to one another. All pretreatments had distinct effects on mineralized N. While the relationships between soils remained consistent across pretreatments, a soil-by-pretreatment interaction effect was detected, driven by differences in field-moist versus air-dried pretreatments. These findings suggest that while relationships between soils may reasonably be compared across studies utilizing differing PMN soil pretreatments, standardization or calibration of soil handling methods is needed for applications such as routine soil testing, in which consistent and comparable values are required.



中文翻译:

孵育前的土壤处理可能会影响潜在矿化氮结果的可比性

摘要

潜在可矿化氮(PMN)是土壤有机氮(N)利用率的一种广泛使用的指标,通常通过孵育来测量。虽然已知在孵育之前对土壤的处理(即预处理)可能会影响孵育期间的氮矿化,但尚未完全评估过预处理对样品之间PMN关系的影响。这项研究的目的是确定冷藏,冷冻,风干和土壤粉碎对PMN的影响,该PMN是在质地不同(泥壤土和沙子)和耕种历史(混合旋转,连续的玉米,以不同的氮含量和旋转放牧的草场进行),并评估各种预处理结果的可比性。方差分析用于比较预处理和土壤的个体效应和交互作用,并进行线性回归以比较不同预处理之间的相互影响。所有预处理对矿化N都有明显的影响。尽管土壤之间的关系在各个预处理之间保持一致,但由于田间湿润与风干预处理之间的差异,因此检测到了逐项土壤之间的相互作用。这些发现表明,尽管在使用不同PMN土壤预处理的研究之间可以合理地比较土壤之间的关系,但对于常规土壤测试等应用,需要对土壤处理方法进行标准化或标定,在其中需要一致且可比的值。然后进行线性回归以比较不同预处理之间的相互影响。所有预处理对矿化N都有明显的影响。尽管土壤之间的关系在各个预处理之间保持一致,但由于田间湿润与风干预处理之间的差异,因此检测到了逐项土壤之间的相互作用。这些发现表明,尽管在使用不同PMN土壤预处理的研究之间可以合理地比较土壤之间的关系,但对于常规土壤测试等应用,需要对土壤处理方法进行标准化或标定,在其中需要一致且可比的值。然后进行线性回归以比较不同预处理之间的相互影响。所有预处理对矿化N都有明显的影响。尽管土壤之间的关系在各个预处理之间保持一致,但由于田间湿润与风干预处理之间的差异,因此检测到了逐项土壤之间的相互作用。这些发现表明,尽管在使用不同PMN土壤预处理的研究之间可以合理地比较土壤之间的关系,但对于常规土壤测试等应用,需要对土壤处理方法进行标准化或标定,在其中需要一致且可比的值。尽管各预处理之间土壤之间的关系保持一致,但由于田间湿润与风干预处理之间存在差异,因此检测到了逐项土壤之间的相互作用。这些发现表明,尽管在使用不同PMN土壤预处理的研究之间可以合理地比较土壤之间的关系,但对于常规土壤测试等应用,需要对土壤处理方法进行标准化或标定,在其中需要一致且可比的值。尽管各预处理之间土壤之间的关系保持一致,但由于田间湿润与风干预处理之间存在差异,因此检测到了逐项土壤之间的相互作用。这些发现表明,尽管在使用不同PMN土壤预处理的研究之间可以合理地比较土壤之间的关系,但对于常规土壤测试等应用,需要对土壤处理方法进行标准化或标定,在其中需要一致且可比的值。

更新日期:2021-01-18
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