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Soil water repellence increased early wheat growth and nutrient uptake

Yeap, S.G.H., Bell, R.W.ORCID: 0000-0002-7756-3755, Scanlan, C., Stefanova, K., Harper, R.ORCID: 0000-0003-0268-2917 and Davies, S. (2022) Soil water repellence increased early wheat growth and nutrient uptake. Plant and Soil .

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Free to read: https://doi.org/10.1007/s11104-021-05282-4
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Abstract

Purpose

Soil water repellence causes uneven soil wetting which can constrain dryland crop and pasture establishment and yield. The same processes are likely to affect nutrient availability from soil and fertiliser, but the effects of repellence on crop growth and nutrition per se have seldom been reported. Here, we investigated early wheat (Triticum aestivum cv. Mace) growth and nutrient uptake responses to repellence.

Methods

Wheat was furrow-sown in severely repellent sandy loam soil (with a wettable furrow base to allow for germination) or completely wettable soil, under uniform plant density and variable topsoil thickness (20 or 100 mm) and fertiliser band placement (below or away from the seed). Tiller number, shoot dry matter, shoot N concentration, total nutrient uptake, and root length density (RLD) were determined.

Results

Contrary to expectations, repellence significantly increased tiller number (by up to 2 tillers per plant), shoot dry matter (by 82%), shoot N concentration (by 0.3% N), and total nutrient uptake (by 87%) at 51 days after sowing, regardless of topsoil thickness and fertiliser placement. In the furrow, RLD of repellent treatments was also nearly double that in wettable treatments when fertiliser was banded below the seed. Results suggest that preferential soil wetting of the furrow in repellent treatments favoured plant nutrient uptake under regular but low water supply.

Conclusion

We conclude that for water-repellent soils with limited water supply, water harvesting techniques such as furrow sowing and banding wetting agents could boost water and nutrient uptake and early crop growth.

Item Type: Journal Article
Murdoch Affiliation(s): Centre for Sustainable Farming Systems
Food Futures Institute
Publisher: Springer
Copyright: © 2022 Crown.
URI: http://researchrepository.murdoch.edu.au/id/eprint/63756
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