Stratification of acidity in the shallow soil surface - experiences in the cropping areas of southern and central NSW

Brendan Scott, Mark Conyers, Burns Helen, Catherine M Evans, Neil Fettell

Research output: Book chapter/Published conference paperConference paperpeer-review

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We examined two long term experiments and two paddock surveys and identified large changes in soil pHCa within the surface 20 or 30 cm of soil. The 5-15 cm was the most acidic layer in most soils; this suggests that soil sampling in the 0-10 cm and 10-20 cm depths is inadequate to describe what the plant may experience. The sharp pHCa changes within the 0-10 cm layer were modified by surface application of some N fertilisers, which acidified the normally less acidic 0-5 cm soil. Liming in a no-till system increased the soil pHCa in the shallow surface and the decrease in soil pH from 0-5 cm to 5-10 cm was even greater than in an unlimed soil. Initially, soil pH testing in finer depth layers in some paddocks should be informative. A regular liming program, with strategic cultivation to incorporate lime more deeply and thoroughly, could be considered.
Original languageEnglish
Title of host publicationProceedings of the 18th Australian Agronomy Conference 2017
Subtitle of host publicationDoing More With Less
EditorsGarry J O’Leary, Roger D Armstrong, Liz Hafner
Place of PublicationAustralia
PublisherAustralian Society for Agronomy
Number of pages4
Publication statusPublished - 2017
Event18th Australian Agronomy Conference 2017 - Mercure Ballarat Hotel & Convention Centre, Ballarat, Australia
Duration: 24 Sep 201728 Sep 2017 (Conference website) (Conference proceedings)


Conference18th Australian Agronomy Conference 2017
Abbreviated titleDoing more with less
OtherThe 18th Australian Agronomy Conference will be held at the Mercure Ballarat Hotel and Convention Centre, Victoria from 24-28 September 2017. The Australian Agronomy Conference is the meeting place for Agronomists; it supports research and the community of Agronomists by connecting Agronomy communities across Australia to each other.

The theme for the 2017 conference is “Doing more with less”. A central plank of Australia’s productive output is agriculture, worth over AUD$13.6 billion exported annually. Agronomy is key to ensuring that farmland is productive across Australia’s diverse landscapes. Innovation in machinery and precision technologies, plant species and varieties, soil and plant management may allow the agronomist of today to successfully help agricultural producers thrive. These innovations are timely as the world deals with increasingly variable climates, environmental degradation, and a more developed global community that requires more diverse products from agriculture.
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