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Are we facing multiple nutrient deficiencies?

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Nutrient rates used are 40 kg P (MAP or a fluid source), 200 kg K (SOP or MOP), and 40-80 kg S (SOA or ATS), with the high application rates designed to allow impacts to be followed through an extended crop rotation... Urea was applied to either balance the N application from MAP, SOA, ATS or applied at a rate to make N non-limiting... All are intended to be evaluated over a series of crops at each site, rather than one-off snap-shots, helping us to understand the residual value of fertilizers applied in northern soils and climates...
GRDC Taxonomy: