摘要
[目的]探讨生物有机肥在镉(Cd)污染农田中的修复效果,保障水稻的安全生产.[方法]选用牛粪生物有机肥、炭基生物有机肥、大豆生物有机肥和海藻生物有机肥,在镉轻度污染稻田中开展为期2年的田间试验,测定土壤理化性质、土壤有效态Cd、水稻生长状况和产量、糙米Cd含量.[结果]田间试验结果表明生物有机肥的施用土壤pH平均提高0.32,碱解氮、有效磷、速效钾和有机质分别平均提高9.38%、15.69%、10.62%、11.64%.水稻株高、穗长、根长、穗重、千粒重和产量分别提高 5.86%、3.83%、16.54%、16.91%、7.14%、3.65%.土壤有效态Cd含量显著下降0.10 mg/kg,降幅为39.12%,糙米Cd含量显著下降45.36%.[结论]生物有机肥在降低土壤Cd生物有效性和水稻籽粒中Cd含量具有显著作用,同时能够促进水稻生长和提高土壤肥力,其中炭基生物有机肥作用效果最好,未来可作为保障水稻安全生产的一项技术措施.
Abstract
[Objective]To explore the remediation effect of bio-organic fertilizer on cadmium-contaminated farmland and ensure the safe pro-duction of rice.[Method]Cattle manure bio-organic fertilizer,biochar-based bio-organic fertilizer,soybean bio-organic fertilizer and seaweed bio-organic fertilizer were selected to carry out a two-year field experiment in paddy fields with mild cadmium pollution.Soil physical and chemical properties,soil available Cd,rice growth and yield,and brown rice Cd content were determined.[Result]The field test results showed that the application of bio-organic fertilizer increased soil pH by an average of 0.32,alkali-hydrolyzed nitrogen,available phosphorus,available potassium and organic matter were increased by an average of 9.38%,15.69%,10.62%and 11.64%,respectively.The plant height,panicle length,root length,panicle weight,1000-grain weight and yield of rice were increased by 5.86%,3.83%,16.54%,16.91%,7.14%and 3.65%,respectively.The available Cd content in soil decreased significantly by 0.10 mg/kg,a decrease of 39.12%,and the Cd content in brown rice decreased significantly by 45.36%.[Conclusion]Bio-organic fertilizer has a significant effect on reducing Cd bioavail-ability in soil and Cd content in rice grains,and can promote rice growth and improve soil fertility.Among them,carbon-based bio-organic fer-tilizer has the best effect,which can be used as a technical measure to ensure the safe production of rice in the future.
基金项目
义乌市省级水稻安全利用技术试验及推广项目(SJZJZC20-22240GK)
国家科技期刊平台
NSTL
万方数据