腐殖酸类营养液改良镉污染稻田土壤和保障水稻安全生产

Humic Acid Nutrient Solution Improved the Soil in Cadmium Contaminated Rice Fields and Ensure the Safe Production of Rice

为开发行之有效、可复制的土壤改良和污染土壤的农业安全种植技术,以典型的中轻度镉污染稻田为试验对象,采用随机区组试验,研究腐殖酸类营养液施用对不同生育期稻田土壤理化性质、稻米镉含量和水稻产量的影响。结果表明,以常规追肥稻田为对照,土壤理化性质得到有效改善,稻田土壤pH提高0.24~0.47个单位、阳离子交换量和交换性钙含量显著提高和保持稻田土壤氮磷钾含量;土壤有效镉含量降低0.15~0.6 mg/kg,精米镉含量分别下降至0.10和0.13 mg/kg,低于食品中污染物限量标准;水稻产量分别增幅11.9%和6.14%。施用腐殖酸类营养液既改善了土壤理化特性、保持土壤速效养分含量,也降低了土壤有效镉含量、保障了水稻的产质量,具有改良土壤和保障镉污染稻田生产安全的应用潜力。

Effects of humic acid nutrient solution application on soil physical and chemical properties,cadmium content and rice yield in paddy fields at different growth stages were studied.Furthermore,it is beneficial to the development of effective and reproducible soil improvement and agricultural safe planting techniques for contaminated soil.The results show that soil physical chemical properties improveing,soil pH increased 0.24~0.47 units,cation exchange capacity and exchangeable calcium content significantly increase and maintaine the soil NPK content.The effective cadmium content of soil decrease by 0.15~0.6 mg/kg,and the cadmium content of refined rice decrease 0.10 and 0.13 mg/kg respectively,which is lower than the standard of pollutant limit in food,and increase rice yield by 11.9%and 6.14%respectively.HANM not only improves the physicochemical properties of the soil,maintains the content of available nutrients in the soil,but also reduces the effective cadmium content of the soil,ensuring the yield and quality of rice,and has the potential to improve soil and ensure the safe production of cadmium-contaminated rice fields.