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Availability of different forms of sulphur fertilisers to wheat andoilseed rape

机译：不同形式的硫磺肥料可用于小麦和油菜

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A pot experiment was conducted to compare the availability and efficiency of three sulphur (S) fertilisers to wheat in the first year and oilseed rape in the second year, using six agricultural soils. Four treatments were applied in the initial year: control (no S), two forms of elemental S (either micronised S degrees particles or a bentonite + S degrees mixture) and a sulphate fertiliser (ammonium sulphate). In the first year, the micronised S degrees was as effective as the sulphate fertiliser, both producing similar increases of wheat grain yield (on average 36%) and S uptake (on average 164%) over the control. In contrast, responses to the bentonite + S degrees form were minimal, indicating a limited S supply. In the second year the control treatment failed to produce seeds in most soils, whereas the micronised S degrees and sulphate treatments increased seed yields of oilseed rape to an average of 13.4 and 12.9 g pot(-1), respectively. The performance of the bentonite + S degrees varied between soils: two soils produced yields similar to those of the other S fertilisers, while the remaining soils had low yields. To test whether the poor performance of the bentonite clay + S degrees fertiliser was due to the lack of exposure of the prills to physical weathering in the glasshouse, the effect of freeze-thaw action on the fertilisers performance was assessed in a separate pot experiment. The responses in wheat yield and S uptake showed that freeze-thaw did not enhance the physical disruption of the prills or fertiliser effectiveness. These results suggest that the release of available S from the bentonite + S degrees mixture was too slow to meet the requirement of wheat and oilseed rape.
机译：进行了盆栽试验，比较了使用六种农业土壤在第一年对小麦和第二年对油菜的三种硫（S）肥料的有效性和效率。在最初的一年中进行了四种处理：对照（​​无S），两种形式的元素S（微粉化的S度颗粒或膨润土+ S度混合物）和硫酸盐肥料（硫酸铵）。在第一年，微粉化的S度与硫酸盐肥料一样有效，两者均比对照产生相似的小麦籽粒增产（平均36％）和S吸收量（平均164％）。相反，对膨润土+ S度形式的响应极小，表明供应的S有限。在第二年，对照处理无法在大多数土壤中产生种子，而微粉化S度和硫酸盐处理将油菜的种子产量分别提高到平均13.4和12.9 g盆（-1）。膨润土+ S度的性能因土壤而异：两种土壤的产量与其他S肥料相似，而其余土壤的产量较低。为了测试膨润土粘土+ S度肥料的不良性能是否归因于在温室内没有将小球暴露于物理风化作用，因此在单独的盆栽实验中评估了冻融作用对肥料性能的影响。小麦产量和S吸收的响应表明，冻融并没有增强颗粒的物理破坏或肥料的有效性。这些结果表明，从膨润土+ S度混合物中释放出的有效硫太慢，无法满足小麦和油菜的需求。

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