Phosphorus availability of sewage sludge-based fertilizers determined by the diffusive gradients in thin films (DGT) technique
Phosphorus availability of sewage sludge-based fertilizers determined by the diffusive gradients in thin films (DGT) technique
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DOI：
10.1002/jpln.201600531
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发表时间：
2017-10
影响因子：
2.5
通讯作者：
C. Vogel;R. Sekine;Daniel Steckenmesser;E. Lombi;D. Steffens;C. Adam
中科院分区：
文献类型：
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作者：
C. Vogel;R. Sekine;Daniel Steckenmesser;E. Lombi;D. Steffens;C. Adam
肥料和土壤中磷的植物有效性对农作物产量有重要影响。然而，除了进行耗时且复杂的盆栽或田间试验外，还没有有效且令人满意地分析污水污泥磷肥中磷的植物有效性的方法。我们采用薄膜扩散梯度（DGT）技术来量化不同类型磷肥的植物磷有效性与新的重点是污水污泥磷肥。将肥料和土壤的混合物在60%持水量下孵育3周。在孵育开始时以及1、2和3周后再次展开DGT装置。两个星期的培养是足够的形成植物有效磷的肥料/土壤混合物。在盆栽试验中，DGT技术预测玉米（Zea mays L.）生物量产量和磷吸收显著更准确地比磷肥的标准化学提取测试（例如水，柠檬酸和中性柠檬酸铵）。因此，DGT技术可以推荐作为一种可靠和稳健的方法来筛选不同类型的污水污泥基磷肥用于玉米栽培的性能，最大限度地减少了耗时和昂贵的盆栽或田间试验的需要。
The plant-availability of phosphorus (P) in fertilizers and soil can strongly influence the yield of agricultural crops. However, there are no methods to efficiently and satisfactorily analyze the plant-availability of P in sewage sludge-based P fertilizers except by undertaking time-consuming and complex pot or field experiments. We employed the diffusive gradients in thin films (DGT) technique to quantify the plant P availability of various types of P fertilizers with a novel focus on sewage sludge-based P fertilizers. Mixtures of fertilizer and soil were incubated for 3 weeks at 60% water holding capacity. DGT devices were deployed at the beginning of the incubation and again after 1, 2, and 3 weeks. Two weeks of incubation were sufficient for the formation of plant-available P in the fertilizer/soil mixtures. In a pot experiment, the DGT technique predicted maize (Zea mays L.) biomass yield and P uptake significantly more accurately than standard chemical extraction tests for P fertilizers (e.g. water, citric acid, and neutral ammonium citrate). Therefore, the DGT technique can be recommended as a reliable and robust method to screen the performance of different types of sewage sludge-based P fertilizers for maize cultivation minimizing the need for time-consuming and costly pot or field experiments.