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REVIEW
Contents Vol 48(2)

Claying and deep ripping can increase crop yields and profits on water repellent sands with marginal fertility in southern Western Australia

D. J. M. Hall A C , H. R. Jones A , W. L. Crabtree B and T. L. Daniels A
+ Author Affiliations
- Author Affiliations

A Department of Agriculture and Food, Western Australia, PMB 50, Esperance, WA 6450, Australia.

B Crabtree Agricultural Consulting, Swanbourne, WA 6010, Australia (www.notill.com.au).

C Corresponding author. Email: david.hall@agric.wa.gov.au

Australian Journal of Soil Research 48(2) 178-187 https://doi.org/10.1071/SR09078
Submitted: 26 April 2009  Accepted: 5 November 2009   Published: 31 March 2010

Abstract

Sandplain soils on the south coast of Western Australia have multiple limitations to crop production that include water repellence, low water and nutrient retention, subsoil acidity, and high soil strength. Crops on sandplain soils achieve, on average, almost 85% of their rainfall-limited yield potential; however, where there are multiple limitations the corresponding value is often <50% in any given year. Previous research has shown the value of applying clay-rich subsoil (‘claying’) to ameliorate water repellent soils and improve nutrient retention. Other studies have shown that deep ripping is effective in reducing compaction in sandplain soils. This paper quantifies the effects of 5 subsoil clay rates (0, 50, 100, 200, and 300 t/ha), with and without deep ripping to 0.5m, on soil properties, crop growth, and profitability in a replicated field experiment.

Crop yields were increased by 0.3–0.6 t/ha as result of added clay. The clay content of the surface soil required to alleviate water repellence and achieve the highest yield increases was 3–6% in soils with ~1% organic carbon. Longer term effects of claying included increased soil organic carbon by 0.2%, pH by 0.6 units, potassium by 47 mg/kg, soil strength by 250 kPa, and cation exchange capacity by 1.3 cmolc/kg to a depth of 0.1 m. However, changes in plant-available water (mm/m) were inconsistent between the clay treatments. Deep ripping to 0.5 m increased crop yields by 0.1–0.5 t/ha. These crop yield responses were still evident 3 years after the ripping treatment had been applied. Soil strength measurements indicate that re-compaction of the ripped treatments had occurred to a depth of 0.2 m in the second year following ripping. Crop responses to claying and deep ripping were additive. Claying and deep ripping, while almost doubling yields, achieved only 50–70% of the rainfall-limited yield potential on these marginally fertile soils. The highest clay rates (>3–6%) had cumulative discounted cash returns $AU100–200/ha higher than the unclayed ‘control’ treatment and $300/ha higher than the lowest clay rates. For most of the clay treatments, deep ripping increased discounted returns between 2005 and 2007 by $80–120/ha.

Additional keywords: water repellence, claying, sands, deep ripping, organic carbon.


Acknowledgments

We thank Luberda family for hosting the experiment and incorporating the site into their cropping program. This project was initiated by the Western Australia No-Till Farming Association (WANTFA) and funded by the Grains Research and Development Corporation (DAW0093, WAN3).


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