Abstract A possible way to improve phosphate rock (PR) agronomic performance is through the addition of elemental sulfur (S0). We used 32P isotope dilution method to assess the P taken up by crops treated with PR. Two experiments, one with common bean and other with upland rice, were carried out, to evaluate the effect of S0 on the agronomic performance of two contrasting PR, applied in different methods. Gafsa (GPR) and Patos de Minas (PPR) were used as the high and low reactivity PR, respectively. The experiments were arranged in completely randomized design on factorial structure 2 × 2 × 2 + 2; which means 2 PR (GPR and PPR) versus 2 S0 condition (with or without-S0) versus 2 application methods (band and broadcast) plus 2 additional treatments (control and triple superphosphate). In band application the S0 increased the amount of P uptake by plants from fertilizer of GPR from 2.57 to 9.86 mg pot−1 for common bean and of 2.26 to 7.05 mg pot−1 to rice. Regardless the management adopted, less than 2% of P applied as PPR has been taken up by crops. The addition of S0 as a strategy to increase the agronomic performance of PR is PR characteristics dependent and fertilizers placement.

中文翻译：

---

磷矿施用元素硫的农艺效益取决于反应性和施肥量

摘要 提高磷矿 (PR) 农艺性能的一种可能方法是添加元素硫 (S0)。我们使用 32P 同位素稀释法来评估经 PR 处理的作物吸收的 P。进行了两个实验，一个是普通豆，另一个是旱稻，以评估 S0 对两种对比 PR 的农艺性能的影响，应用在不同的方法中。Gafsa (GPR) 和 Patos de Minas (PPR) 分别用作高和低反应性 PR。实验采用完全随机设计的因子结构 2 × 2 × 2 + 2；这意味着 2 PR（GPR 和 PPR）对比 2 S0 条件（有或没有 S0）对比 2 种应用方法（带和广播）加上 2 种额外的处理（对照和三重过磷酸钙）。在条带施用中，S0 使植物从 GPR 肥料中吸收的磷量从普通豆的 2.57 至 9.86 mg pot-1 和水稻的 2.26 至 7.05 mg pot-1。无论采用何种管理方式，作为 PPR 施用的磷中只有不到 2% 被作物吸收。添加 S0 作为提高 PR 农艺性能的策略取决于 PR 特性和肥料放置。