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In two orchards with 4 year old citrus trees, of the varieties Siam and Terigas, a scientific trial was performed by the Indonesian Research Institute in citrus and subtropical fruit, in collaboration with SQM Europe N.V., from November 2016 till August 2017. Both locations had comparable inceptisol soils. The trial with a total of 6 treatments  was designed in a randomised complete block with 4 repetitions and 2 trees per plot. Expected yield for the Siam variety was 50 kg/tree/yr, higher than the expected yield for the Terigas variety trial (20 kg/tree/yr), and the recommended fertiliser rates were adjusted accordingly with a lower NPK recommendation for the Terigas citrus orchard compared to the Siam citrus orchard. Four increasing Qrop® complex Top K 12-6-24 rates - split over 3 applications - were compared to an unfertilized control and the farmers practice using one application of subsidised urea and superphosphate fertilisers and unsubsidised potassium chloride.

In the two trials, Qrop® complex Top K 12-6-24 at the highest tested dose 9,38 (Siam variety trial) resp. 3,75 kg/tree/year (Terigas variety trial) increased yield in kg/tree/year by 24% resp. 31% over the traditional single fertiliser application of Urea, KCl and superphosphate . The highest Qrop® applications also achieved a higher K content in the leaves, and a higher brix value of the fruit juice.