Comparison of Three Methods to Estimate Organic Carbon in Allophonic Soils in New Zealand

M. Hasinur Rahman*, Markus Deurer, Allister W. Holmes, Steven J Saunders, Alistair Mowat and Brent E Clothier

The Carbon in Orchard Soils Team, PlusGroup Ltd., Horticulture Innovation Centre, Newnham Park, Te Puna, Tauranga 3172, New Zealand *Corresponding author’s e-mail: technical@plusgroup.co.nz

1. Soil sequesters huge amounts of carbon derived from organic and inorganic sources.

2. Soil organic carbon (SOC) has to be periodically measured for the study of ecology, soil science and climate change.

3. Carbon in soil samples is converted to carbon dioxide in the laboratory and this is then measured directly or indirectly by different methods.

4. Many methods used for estimating SOC are time consuming and costly.

5. Loss-on-ignition (LOI) has been considered as a rapid, inexpensive and convenient method

The objective of this study was to establish a NZ kiwifruit specific regression equation to estimate SOC from LOI.

We collected 121 allophanic soil (Vitrads/Vitricryands Andisol, USDA; Mollic Andosol, FAO; Ando Soil, Japanese system) formed predominantly from rhyolitic tephra between ~ 4000 and 40,000 years ago during the region’s geographic history of periodic volcanic eruptions) samples from three regions (Katikati: 37o36S 175o56E; Tauranga: 37o43S 176o06E and Te Puke: 37o47S 176o23E) of kiwifruit orchards in the Bay of Plenty area of New Zealand with organic, biological and integrated management systems... Download full article.

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