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Type: Journal article
Title: Clay addition to sandy soil - effect of clay concentration and ped size on microbial biomass and nutrient dynamics after addition of low C/N ratio residue
Author: Tahir, S.
Marschner, P.
Citation: Journal of Soil Science and Plant Nutrition, 2016; 16(4):864-875
Publisher: Instituto de Agroindustria, Universidad de La Frontera
Issue Date: 2016
ISSN: 0718-9508
Statement of
Shermeen Tahir and Petra Marschner
Abstract: Addition of clay-rich subsoil to sandy soil has been shown to increase crop production on sandy soils. The added clay is present as peds ranging in size from a millimetre to several centimetre. In thisexperiment clay soil (73% clay) was added to sandy soil (3% clay) at 10 and 20% clay w/w as 1, 3 and 5 mm peds. Shoots of young Kikuyu grass (C/N 20) were ground and added at 10g kg-1, and soils were incubated for 45 days at 80% of water holding capacity.The study confirmed that clay addition to sandy soil increased soil organic carbon retention but decreased cumulative respiration and available P compared to sandy soil alone. Ped size had little effect on respiration and nutrient availability. Over the course of 45 days peds broke down and organic C was bound to the < 53 μm fraction. The greatest proportion of peds and total organic carbon (54-67%) was in the initially added ped size. The TOC content of < 53 μm fraction of initially added peds was 0.38% and at the end of the experiment (after 45 days) the TOC had increased by 24, 19 and 10% in 1, 3 and 5 mm peds respectively.
Keywords: Claying; organic carbon retention; clay peds; sandy soils
Rights: Creative Commons License. All the contents of this journal, except where otherwise noted, is licensed under a Creative Commons Attribution License
DOI: 10.4067/S0718-95162016005000061
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Appears in Collections:Agriculture, Food and Wine publications
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