EFFECTS OF NITROGEN-CONTAINING FERTILIZERS ON SOLUBILITY AND PLANT UPTAKE OF CADMIUM
EFFECTS OF NITROGEN-CONTAINING FERTILIZERS ON SOLUBILITY AND PLANT UPTAKE OF CADMIUM
复制标题
DOI：
10.1007/bf00507075
复制
发表时间：
1990-02-01
影响因子：
2.9
通讯作者：
ERIKSSON, JE
中科院分区：
文献类型：
--
作者：
ERIKSSON, JE
在盆栽试验中，比较了 NO3- 和 NH4+ 含量不同的三种氮肥对 pH 7 下 1M 醋酸铵中土壤镉可提取性的影响，以及对冬油菜 (Brassica napus L. var. oleifera Metzger) 吸收天然和添加镉的影响。在另一个类似的实验中，将接受以浓缩颗粒形式施用的 NPK 肥料的土壤中的镉有效性与接受均匀施用溶解的 NPK 肥料的土壤中的镉有效性进行了比较。使用壤质沙土和粘土。使用氮肥时，石灰处理的硝酸盐中可提取的土壤镉和植物镉含量最低，硫酸铵处理中最高，硝基白垩处理中居中。向土壤中添加 1 mg kg-1 DW Cd 会增加 Cd 水平，但不会改变响应模式。各种肥料对镉有效性的影响与其对土壤 pH 值的影响之间存在很强的相关性：酸化作用越强，镉有效性越高。当低剂量施用时，颗粒状氮磷钾比溶解性氮磷钾更有效地增强植物从两种土壤中吸收镉，但当对沙子施用较高剂量时，情况并非如此。两种形式的氮磷钾对土壤可提取镉的影响差异不大。接受高镉含量颗粒 NPK 的土壤比接受低镉颗粒 NPK 的土壤对镉的吸收量更大。在这两个实验中，从沙子中吸收的可萃取镉比从粘土中吸收的程度更大。肥料剂量的增加通常会导致土壤镉水平和植物中镉浓度的增加。
In a pot experiment, three N-fertilizers, differing in NO3- and NH4+ content, were compared in terms of their effects on the extractability of soil Cd in 1M ammonium acetate at pH 7 and on the uptake of native and added Cd by winter rape (Brassica napus L. var. oleifera Metzger). In another similar experiment the Cd-availability in soils receiving NPK-fertilizer applied in a concentrated, granulated form was compared to that in soils receiving a uniform application of dissolved NPK-fertilizer. Both loamy sand and clay soils were used. With the N-fertilizers levels of extractable soil Cd and plant Cd-contents were lowest in the nitrate of lime treatment, highest in the ammonium sulphate treatment and intermediate in the nitro-chalk treatment. The addition of 1 mg kg-1 DW Cd to the soil increased Cd-levels but did not change the response pattern. There was a strong association between the effects of the various fertilizers on Cd availability and their effects on soil pH: the stronger the acidifying effect the higher the Cd availability. When applied at a low dose, granular NPK was more effective than dissolved NPK at enhancing plant uptake of Cd from both soils, but this was not the case when applied at a higher dose to the sand. The two forms of NPK differed little in their effect on extractable soil Cd. Plant uptake of Cd was greater from soils receiving granular NPK with a high Cd-content than from those receiving granular NPK low in Cd. In both experiments extractable Cd was taken up to a greater extent from the sand than from the clay. An increase in fertilizer dose generally resulted in an increase in levels of soil-Cd and in Cd concentrations in the plants.