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Long-term fate of fertilizer sulfate- and elemental S in co-granulated fertilizers
Nutrient Cycling in Agroecosystems ( IF 2.4 ) Pub Date : 2021-04-09 , DOI: 10.1007/s10705-021-10137-6
Fien Degryse , Roslyn Baird , Ivan Andelkovic , Michael J. McLaughlin

In previous studies, we assessed sulfur (S) uptake by crops from elemental S (ES) and sulfate-S (SO4-S) in S-fortified monoammonium phosphate fertilizers over two years. The recovery by the crop ranged from 16 to 28% for ES and from 9 to 86% for SO4-S. Here, we used a model which takes into account organic S cycling, SO4-S leaching and ES oxidation to explain the observed recoveries. Higher recoveries of ES than SO4-S in two of the four sites could be explained by partial leaching of SO4-S and relatively fast oxidation of ES, due to a warm climate and high S-oxidizing soils. The same model was used for longer-term (5-year) predictions, and a sensitivity analysis was carried out. The size of the labile soil S pool and total S uptake strongly affected the recovery of both SO4-S and ES. Predicted recoveries after 5 years were over threefold higher for a small than for a large labile organic S pool and for a high-uptake than for a low-uptake scenario. Leaching mainly affected SO4-S, with predicted recoveries halved under a high-leaching scenario. Slow oxidation resulted in recoveries in the first year being fourfold lower for ES than for SO4-S or even lower in case of a long lag-time. However, it is predicted that total recoveries of ES will eventually reach those of SO4-S or exceed them if there is SO4-S leaching. Our model demonstrates that long-term trials are needed to evaluate the true effectiveness of a slow-release fertilizer source such as ES.



中文翻译:

混粒肥料中硫酸盐和元素S的长期命运

在以前的研究中,我们评估了两年来,S强化磷酸一铵肥料中作物从元素S(ES)和硫酸盐S(SO 4 -S)吸收的硫(S)。ES的作物收成率在16%到28%之间,SO 4 -S的收成率在9%到86%之间。在这里,我们使用了考虑有机S循环,SO 4 -S浸出和ES氧化的模型来解释观察到的回收率。在四个位置中的两个位置,ES的回收率高于SO 4 -S,这可以通过SO 4的部分浸出来解释。-S和相对较快的ES氧化,这归因于温暖的气候和高S氧化土壤。长期(5年)预测使用相同的模型,并进行了敏感性分析。不稳定土壤S库的大小和总S吸收量强烈影响SO 4 -S和ES的恢复。5年后的预测回收率,对于小而不稳定的有机S池和高摄入量,其回收率要比低摄入量高三倍以上。浸出主要影响SO 4 -S,在高浸出情况下,预计的采收率减半。缓慢的氧化导致第一年的回收率比ES 4低四倍-S或更长的滞后时间甚至更低。但是,据预测,如果有SO 4 -S浸出,ES的总回收率最终将达到SO 4 -S的回收率或超过它们。我们的模型表明,需要长期试验来评估缓释肥料来源(例如ES)的真实有效性。

更新日期:2021-04-09
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