Research On Copper And Zinc Morphlogical Change And Bioavailability During Decomposition Of Manure

Copper(Cu) and Zinc(Zn) is a trace element essential to plant and a heavy metal. The high- level Cu or Zn manure is used for long term, it can also be caused by the accumulation of heavy metals in the soil, it is absorbed by crops and agricultural products and enter the food chain and pollution and the environment to a substantial risk. At present, people have taken note of the heavy metals absorbed by the livestock feed is added into the soil crops in this way, enter the human food chain and affect human health . Heavy metals in manure is changing in the process of decomposition. Therefore, heavy metals in manure may cause agricultural and environmental hazards, the problem for heavy metals in the manure - the soil - the plants in the process of transformation, absorption and other research is need.This experiment simulated high-level Cu and Zn manure into the soil after application, during decomposition in its form and content of change and its effects on biological effectiveness of the evaluation made. Experimental use of indoor training, use of H2O, NaOH, NaOH-Na2P4O7 extract on the cow dung and mixture manure(cow and chicken dung), study on different insoluble organic carbon and effective Cu, Zn content , and Cu and Zn in plant leaves and stems root in the distribution of content. These is the major conclusions:1. Manure decomposition of water-soluble organic carbon decline, HA /FA decline in early and increase in latter. Alkali-soluble organic carbon content in early fall, late has increased, HA /FA is in a slight downward trend. NaOH - NaOH-Na2P4O7 extraction of organic carbon, cow dung at first increase after decreasing trend, and cow dung mixed with chicken manure is the opposite. HA /FA is the overall upward trend. Dung and cow dung mixed compared to water-soluble and insoluble alkali, NaOH - NaOH-Na2P4O7 extraction of organic carbon content higher than the corresponding cow dung, and HA /FA is higher than the corresponding.2. Manure handling both water-soluble and insoluble base humus bound copper content with the decomposition process showed the first increase after the lower trend, cow dung of fulvic acid - With the decomposition of copper fell after the first time has increased, humic acid -- With the decomposition of copper was first time after rising drop. Dung mixed with cow dung is not identical to the trend. Mixture of humus extraction of copper bound to fall after rise, which, humic acid - copper upward trend, fulvic acid - copper decreased. Three of extraction from the humus bound zinc and copper in the changes inconsistent, sometimes with the opposite trend.3. With the increase in the use of manure, alkali-soluble, the mixture of humus extraction of copper bound to increase, with the rot and fall of the time. Alkali humus insoluble bound to the rich in copper, acid - mainly copper, with the rot of time to increase extraction of humus mixture of copper bound to humic acid - mainly copper, with smaller decomposition time. With the increase in the use of manure, alkali-soluble, extraction mixture of humus bound zinc was also increasing. Alkali-soluble zinc humus, humic acid - zinc first increase after the lower fulvic acid - is the opposite of zinc, and the mixture of zinc extraction of humus, humic acid - zinc decreased.4. The effectiveness of biological experiments show that the use of manure as the increase in the Cu and Zn content of vegetables was an upward trend, but as the number of days the plant growth increased. Overall, the plants containing Cu, Zn, the size of the order is: root> stem> leaves; Department Cu and Zn at the root of the stems and leaves in the size of the order is: 5% copper (zinc) soil> 3% copper (zinc ) Soil> 1% copper (zinc) soil. Root vegetables, the copper content in the stem and base insoluble, mixture of copper were positively correlated. The mixture of copper and copper extraction of humus was positively correlated. Roots, stems and zinc content in the extraction of humus mixture of zinc was positively correlated with the mixture of humus zinc extraction correlation not significant. Leaves of zinc and alkaline insoluble, humus mixture of zinc extraction correlation is not significant.