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Sands have favourable physical properties for harvesting peanut, but improving S and water use efficiency on these soils remains a challenge. We studied partial S balance in irrigated peanut crops on sands of Central Vietnam to identify key factors of S fertiliser management affecting S inputs and outputs. Field trials were conducted in the spring seasons of 2015 and 2016 to determine the effects of S application rates (0, 15, 30, 45 kg ha -1 ) on peanut yield and partial S balance. Sulfur balances were negative (-28.3 to 5.6 kg S ha -1 ) at rates < 30 kg S ha -1 , while at higher rates of S fertiliser application that produced maximum pod yield (30 -45 kg S ha -1 ), three of four sites showed neutral to slightly R I P T positive S balance (1.5 -5.6 kg S ha -1 ). The negative partial S balance decreased with increasing S rates but was mostly attributable to the large S removal in peanut shoots (9.7 -22.3 kg S ha -1 ) which are used on farms for animal feed. The negative partial S balance results in depletion of soil S reserves and hence efficient recycling of S on farms is critical for sustainable crop production on sands of VN.

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