Refinement of Passive Nematode Recovery from Cotton Growing High Clay Content Australian Vertisols. Issue 3 (4th February 2017)

• Record Type: Journal Article
• Authors: Knox, O.G.G.; Griffiths, B.S.
• Is Part Of: Communications in soil science and plant analysis. Volume 48:Issue 3(2017)
• Page Start: 316
• Page End: 325
• Publication Date: 2017-02-04
• Subjects: Acrobeles -- Axonchium -- colloidal silica -- Ludox -- Pratylenchus; Soil science -- Periodicals; Plants -- Chemical analysis -- Periodicals; Agricultural chemistry -- Periodicals; 631.405
• DOI: 10.1080/00103624.2016.1269800
• Languages: English
• ISSNs: 0010-3624

Abstract

ABSTRACT: Vertisols are characterized by their high clay content, which can hinder assessment of their soil biology. Recovery of nematodes from vertisols with active techniques has indicated that free living nematode numbers within Australian vertisols are often low. Despite this, cotton yield losses due to the reniform nematode have recently been reported in Australia. In light of this and other changes in the cotton production system, we undertook a series of experiments to determine whether passive nematode extraction techniques could be applied to high clay vertisols. Existing published passive nematode recovery methods proved to be inefficient. The use of sodium hexametaphosphate as a clay dispersant was found to further reduce effectiveness. Instead, direct extraction of soil in Ludox at 1.1 g/cm 3 followed by sieving was found to be as effective at recovering nematodes using Baermann funnel extraction from fresh soil but considerably quicker and three times more effective with dried soil.