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Long-term Tillage and Irrigation Effects on Aggregation and Soil Organic Carbon Stabilization Mechanisms by N. Dal Ferro; B. Stevenson; F. Morari; K. Müller is a Environmental Science article available to read on EtoBox.

What is Long-term Tillage and Irrigation Effects on Aggregation and Soil Organic Carbon Stabilization Mechanisms about?

Sustainable soil management practices are required in agriculture to enhance carbon sequestration and restore soil functions. Here, the aim was to investigate the effect of different tillage practices combined with or without irrigation on (i) soil organic carbon (SOC) content, (ii) fungal biomass and their relationships with aggregate size classes in the soil surface layer; further, (iii) the concept of soil particle saturation with SOC was tested to evaluate if a threshold was reached in a 14 year-experiment. Our hypothesis was that long-term irrigation, intensive tillage and their combination, would negatively affect soil aggregation and SOC stabilization. The experiment has started in 2003 on a research farm in Canterbury, New Zealand. The present work focused on two contrasting tillage practices –intensive tillage with 20–25 cm ploughing (IT) and direct drill (DD)– combined with sprinkler-irrigated and non-irrigated (hereafter called Rainfed) conditions in a split-plot experimental design. Soil samples (0–5 cm layer) were analyzed for pore size distribution, specific surface area and microbial biomass. Further, wet sieving was used to isolate large macroaggregates (LM, > 2000

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Author

N. Dal Ferro; B. Stevenson; F. Morari; K. Müller

Publisher

Elsevier BV

Published

2023

Language

EN

Field

Environmental Science (Physical Sciences)