Soil fertilization with trace‐metal rich organic fertilizers such as Fucus serratus seaweed may be an effective way to combat micronutrient deficiency. In this study the kinetics of zinc release from Fucus serratus seaweed was investigated in a packed soil column leaching experiment over 1,776 h. The release of zinc from control (soil only) and treatment (soil + seaweed; equivalent zinc application rate of 1.42 kg ha⁻¹) columns, measured by ICP‐MS, demonstrated two distinct release stages. The cumulative zinc release data for each phase were fitted to five kinetic models: zero order, first order, Elovich, power function and parabolic diffusion. In the first stage (0–400 hours) the release of zinc from both control and treatment was best described by a parabolic rate law, indicating release of zinc from a soluble soil reservoir. In the second stage (400–1,776 h) zinc release followed a zero order rate law indicative of slow release from an essentially insoluble reservoir. The modelled difference between the amount of zinc released from treatment and control columns in stage 1 (230 ± 11 µg) represented the total amount of zinc added via seaweed. The parabolic rate constant for seaweed zinc release was 12.09 µg g⁻¹ h^−0.5. In summary, the addition of F. serratus to soil is a viable source of labile zinc and a low cost agronomic option for mitigating zinc deficiency in soils.

中文翻译：

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作为土壤改良剂的海藻（Fusus serratus）的水提取锌释放动力学

用富含微量金属的有机肥料（例如锯齿海藻）的土壤施肥可能是对抗微量营养素缺乏的有效方法。在这项研究中，在1,776 h的填充土壤柱浸出实验中研究了锯缘海藻海藻中锌释放的动力学。从对照（仅土壤）和处理（土壤+海藻）中释放锌；当量锌施用量为1.42 kg ha ^-1）柱，通过ICP-MS测定，显示了两个不同的释放阶段。每个阶段的累积锌释放数据拟合到五个动力学模型：零阶，一阶，Elovich，幂函数和抛物线扩散。在第一阶段（0–400小时），用抛物线速率定律最好地描述了对照和处理中锌的释放，表明锌从可溶性土壤储层中释放。在第二阶段（400-1,776小时），锌的释放遵循零级速率定律，表明从基本不溶的储层缓慢释放。第1阶段从处理柱和对照柱释放的锌量之间的模型差异（230±11 µg）代表通过海藻添加的锌总量。海藻锌释放的抛物线速率常数为12.09 µg g^-1小时^-0.5。总而言之，向土壤中添加锯缘青霉是不稳定的锌的可行来源，并且是减轻土壤中锌缺乏的低成本农艺选择。