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Barley nutrition and agronomy - do we need sulphur and nitrogen?
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S requirements should be locally assessed on a paddock to paddock basis; consider fertiliser history, cropping rotation, product removal and soil test data... Overall, N was the key nutrient driving early growth responses at all sites (Table 3) in 2012, and the N balance was more important than S. Similar yields were achieved from applying N as Urea alone, as SoA, or as a Urea and gypsum combination (Figure 1) at all sites, except at Lameroo where an additional response to combined N and S was found... The response is not uncommon in Mallee farming systems, as DAP/MAP will supply a proportion of the N requirement, and the ongoing crop demand for N can be assessed throughout the growing season to better match seasonal conditions (soil moisture) with N supply...
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