Alvarez J M, Novillo J, Obrador A, López-Valdivia L M
Departamento de Química y Análisis Agrícola, Escuela Técnica Superior de Ingenieros Agrónomos, Universidad Politécnica de Madrid, Ciudad Universitaria, s/n, 28040 Madrid, Spain.
J Agric Food Chem. 2001 Aug;49(8):3833-40. doi: 10.1021/jf010037i.
A study of soil columns was conducted to evaluate Zn movement potential in two reconstructed soil profiles. Zn-phenolate, Zn-EDDHA, Zn-EDTA, Zn-lignosulfonate, Zn-polyflavonoid, and Zn-heptagluconate were applied in the upper zone of the column. The different physicochemical properties of the two soils and the micronutrient source may influence Zn leaching, the distribution of Zn among soil fractions, and the Zn available to the plant in the depth of the layers. In Aquic Haploxeralf soil, the application of six fertilizers produced little migration and very small leaching of Zn in the soil profiles. In Calcic Haploxeralf soil, Zn-EDTA migrated and was distributed throughout the soil columns. This Zn chelate produces a loss of Zn by leaching, which was 36% of the added Zn. In the latter soil, Zn leached very little with the other five fertilizer treatments. The same as for these organic Zn complexes, the retention of added Zn indicated the potential of metal accumulation in the A(p) horizons of the two soil profiles. A large portion of applied Zn was available to plants [diethylenetriaminepentaacetic acid (DTPA) and Mehlich-3 extractable Zn] in the depths reached by the different commercial formulations. The relationship between the two methods was highly significant (Mehlich-3-Zn = 1.25 + 1.13 DTPA-Zn, R(2) = 99.19%). When Zn was added as Zn-EDTA, the amounts of the most labile fractions (water-soluble plus exchangeable and organically complexed Zn) increased throughout the entire profile column in comparison with the control columns, although in the B(t) horizon of the Aquic Haploxeralf soil they increased only slightly.
开展了一项土柱研究，以评估两种重构土壤剖面中锌的迁移潜力。在柱体上部区域施用了酚锌、乙二胺二邻苯基乙酸锌（Zn-EDDHA）、乙二胺四乙酸锌（Zn-EDTA）、木质素磺酸锌、多黄酮锌和七葡糖酸锌。两种土壤不同的物理化学性质以及微量营养源可能会影响锌的淋溶、锌在土壤组分间的分布以及各土层深度中植物可利用的锌。在潮湿弱发育老成土中，施用六种肥料后锌在土壤剖面中的迁移和淋溶很少。在石灰性弱发育老成土中，Zn-EDTA发生迁移并分布于整个土柱。这种锌螯合物通过淋溶导致锌损失，损失量占添加锌的36%。在后者土壤中，其他五种肥料处理下锌的淋溶很少。与这些有机锌配合物情况相同，添加锌的留存表明两种土壤剖面的A(p)层具有金属积累潜力。在不同商业配方所及深度，大部分施用的锌对植物来说是可利用的[二乙烯三胺五乙酸（DTPA）和Mehlich-3可提取锌]。两种方法之间的关系极为显著（Mehlich-3-锌 = 1.25 + 1.13 DTPA-锌，R² = 99.19%）。当以Zn-EDTA形式添加锌时，与对照柱相比，整个剖面柱中最不稳定组分（水溶性加可交换态和有机络合态锌）的量均增加，不过在潮湿弱发育老成土的B(t)层中仅略有增加。
