Corn And Centipede Grass, Grain Amaranth Strip Cropping On Soil Heavy Metals Cd, Pb Uptake And Accumulation Characteristics

By centipede grass, grain amaranth and corn pot and field experiments to explore the centipede grass and grain amaranth and heavy metal enrichment law, intercropping and crop effects and impact analysis of maize under different cropping patterns, centipede grass and grain amaranth and absorption of heavy metals in soil and accumulation characteristics, the study found:1、In pot test, comparison the three maize varieties processing, found that discovery process C (greenstone 269), centipede grass, grain amaranth’s Cd, Pb content are maximum; soil Cd, Pb enrichment is the most obvious; corn various parts of Cd, Pb are minimum; in the same species processing, corn+centipede centipede grass pattern grass Cd, Pb enrichment of the largest, corn and grain amaranth grain amaranth mode Cd, Pb enrichment of the largest, Cd maize corn grain amaranth+najas+mode, Pb content is lowest, in various parts of corn Cd, Pb the content of the order of root>stem>leaf>grain; corn grain corn+Cd only centipede grass+mode processing grain amaranth, Pb content of the national requirements of the standard.2、In the field test, the comparison of the three row spacing treatment, found that treatment F (spaced 100cm), centipede grass, grain amaranth’s Cd, Pb-year maximum content; soil Cd, Pb enrichment is the most obvious; corn various parts of the Cd, Pb value up minimal; in the same row spacing, the corn+centipede centipede grass to grass Cd, Pb enrichment of the largest corn and grain amaranth grain amaranth mode Cd, Pb enrichment of the largest corn+centipede grass+maize grain amaranth mode Cd, Pb content was lowest in various parts of corn Cd, Pb the content of the order of root>stem>leaf>grain; corn grain corn+Cd only centipede grass+grain amaranth mode processing, Pb content of the national requirements of the standard.3、To sum up, we can get in the pot experiment, the processing C (greenstone 369)+centipede grass+grain amaranth, Cd, Pb of the corn at minimum content; in the field experiments deal with F (spaced 100cm)+centipede grass+grain amaranth, the corn various parts of the Cd, Pb are minimum content, achieve national food safety requirements.