Churchman, G.2019-03-042019-03-042018Journal of Plant Nutrition and Soil Science, 2018; 181(1):99-1031436-87301522-2624http://hdl.handle.net/2440/118011Defining soil clay minerals as all inorganic particles < 2 µm would enhance their predictive power for soil functions. The future task is to unravel the prominent functional role of clay associations in the “ultimate particles” in soils-microaggregates. High energy techniques and decomposition of XRD patterns offer the prospect of understanding associations of silicates, oxides and organic matter within microaggregates.en© 2018 WILEY-VCH Verlag GmbH & Co. KGaA, WeinheimMicroaggregates; mineralogy; mineral-organic associations; oxides; phyllosilicatesJournal article003008109910.1002/jpln.2017006050004243784000132-s2.0-85039786775392665