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Long term greenhouse evaluation of partially acidulated phosphate rock fertilizers ii. effect of cogranulation with elemental sulfur on availability of phosphorus from two phosphate rocks



Long term greenhouse evaluation of partially acidulated phosphate rock fertilizers ii. effect of cogranulation with elemental sulfur on availability of phosphorus from two phosphate rocks



Fertilizer Research 13(1): 45-54



The effect of cogranulation with elemental sulfur (S) on the availability of phosphorus (P) from partially acidulated phosphate rock (PAPR) prepared from Christmas Island or Duchess phosphate rock (PR) was studied as part of a larger experiment examining factors affecting the agronomic effectiveness of PAPR sources. PAPRs congranulated with (10% w/w) or without elemental S were compared at four rates of P (excluding controls) in the presence and absence of supplementary sulfate (SO4) from gypsum on a P-deficient pasture soil with no previous history of elemental S applications. Lucerne (Medicago sativa L., cv. CUF101) yields and P and S uptake were determined in six bulked harvests collected over a 2-year period. Large responses to P rates were recorded but only minor and inconsistent responses to SO4-S occurred during the experiment. In contrast, elemental S in PAPR granules resulted in greater lucerne yields and P and S uptake by lucerne tops; these effects, which did not appear until 6 months after application, were atributed to the acidulation of residual PR in PAPR granules by action of H2SO4 produced by the oxidation of elemental S. These effects increased with increasing rates of PAPR applied and were greater for the Christmas Island PAPRs and at the 50% acidulation rate. This was attributed to the development of a more prolific root system at the higher P rates and the higher levels of soluble P provided by 50% PAPRs which enabled plants to more fully exploit P solubilized from S-granulated PAPR products.

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