黄土丘陵区土壤钼锌含量及农作物对钼锌的反应

Concentration of Molybdenum and Zinc in Soil of Upland of Loess and Response of Crops

采用田间土壤采样及施钼、锌肥试验,分析了黄土丘陵区土壤钼锌含量及农作物对钼锌的反应。结果表明,黄土丘陵区土壤有效钼含量为0.013—0.632mg·kg-1,一般川地高于塬地、山地,表层高于底层;有效锌变幅为0.055—1.972mg·kg-1,平均为0.388mg·kg-1,在临界值0.5mg·kg-1以下。施钼酸铵肥料可增加作物籽粒及果实中钼含量,比对照增加0.056—12.9mg·kg-1,并可降低硝酸盐、亚硝酸盐含量,降低2.7%—91.3%。施硫酸锌肥料可增加作物籽粒及果实中锌含量,增加11.2%—214.4%。

A survey was conducted to evaluate contents of molybdenum and zinc, essential trace elements for crop, in soil of Upland of Loess. It has been found that the concentrations of available state of molybdenum was in a range of 0.013 to 0.632 mg·kg-1 in the soil, while it was higher in valley than in highland and mountain areas and higher in surface than in bottom. The concentrations of available state of zinc varied from 0.055 to 1.972 mg·kg-1 in the soil, with an averaged level of 0.388 mg·kg-1, below the critical value 0.5mg·kg-1.The concentrations of Mo in crop seeds and fruits from the treated plots receiving ammonium molybdate fertilizer increased by 0.056—12.9 mg·kg-1,in comparing with the control, while those of zinc in the treated plots receiving zinc sulfate fertilizer enhanced by 11.2% to 214.4% against the control. In the meantime, the concentrations of nitrate and nitrite reduced by 2.7% to 91.3%, respectively.