Armstrong, RD and Dunsford, K and McLaughlin, MJ and McBeath, T and Mason, S and Dunbabin, VM, Phosphorus and nitrogen fertiliser use efficiency of wheat seedlings grown in soils from contrasting tillage systems, Plant and Soil, 396, (1-2) pp. 297-309. ISSN 0032-079X (2015) [Refereed Article]
Copyright Springer International Publishing Switzerland 2015
Aims This paper assessed the effect that the vertical stratification of nutrients in conservation cropping systems of Australia has on phosphorus (P) and nitrogen (N) fertiliser use efficiency.
Methods Intact soil cores from two long-term tillage experiments, located on a Vertosol and on a Calcarosol were used to assess if tillage system (zero tillage - ZT vs conventional tillage - CT) and soil water influence fertiliser use efficiency (using 33P and 15N) of wheat under controlled growth conditions.
Results Adding P increased shoot growth and P uptake on the Calcarosol, provided the surface remained moist and N was applied. The percentage of plant P derived from fertiliser (Pdff) was greater on the Calcarosol regardless of tillage practice. Pdff increased when the soil remained wet or when N was added. The percentage of N derived from fertiliser (%Ndff) was not affected by tillage practice on the Vertosol but when the soil surface was allowed to dry, it was significantly greater under ZT than CT on the Calcarosol. Adding P increased N fertiliser recovery but tillage practice had no effect.
Conclusion The effect of tillage practice on P and N fertiliser use efficiency depends on soil and topsoil water status.
|Item Type:||Refereed Article|
|Keywords:||wheat, tillage, nutrient use efficiency, 15N, 33P|
|Research Division:||Agricultural and Veterinary Sciences|
|Research Group:||Crop and Pasture Production|
|Research Field:||Crop and Pasture Nutrition|
|Objective Division:||Plant Production and Plant Primary Products|
|Objective Group:||Winter Grains and Oilseeds|
|Author:||Dunbabin, VM (Dr Vanessa Dunbabin)|
|Deposited By:||Tasmanian Institute of Agriculture|
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