Preparating Biological Produtions For Degradating Organic Phosphor Pesticide And Applying Them In Spinach

In the process of agriculture production, the damnification of output could be redeemed from 10% to 20% by means of prevention and cure technology acting on crops. Therefore, applications of chemical pesticide with low-cost and quick-efficiency have became the crucial act in agriculture production. Today, there have amounted to thousands of pesticide all over the world, in which the output of more than 250 kinds of pesticide in common use has achieved 50 millions tons per year. Organic phosphor pesticide, which has been employed for more than 70 years and still in use, not only are widely accepted and excel in exterminating pest but also are used easily and has a rapid impact. Hundreds of organic phosphor pesticide are applied around the world among which approximately 200 hundreds come from China. The turnout of organic phosphor pesticide accounts for half of the total, which is one thirds of the whole output in the world.Usually, organic phosphor pesticide with stronger toxicity could do great harm to human beings, herds even also environment. According to long-period using in limited area of organic phosphor pesticide, serious attention has been concentrated on the residuals in food. It has been calculated that almost one thirds of applied dosage is assimilated or stay in the soil. Thus it holds the balance that degradating the residuals of organic phosphor pesticide in food and providing excellent healthy food conduces to high living quality of people.With correlative research, there are rare earth elements bound polysaccharides in plants. The complex has characteristics of hydrolyzing DNA. Another inspiring research result is that the complex can be made from polysaccharides and Ce4+ and that the complex has characteristics of phosphodiesterase. Consequently, the coplexs, which are made from polysaccharides and rare earth elements, could degradate the organic phosphor pesticide. In recent experiments, it was proved that there were much amount rare earth elements in natural algal polysaccharides and that the major ingredient of rare earth elements is cerium. This results suggest that some biological produtions for degradating pesticide residual amount can be preparated and applyed them to the production of nuisance free food.In this master paper, it was found that degradation of the complex made from P4 and cerium for methamidophos was the most evidance among diverse saccharide ligands and rare earth elements. At 25 centigrade, degradation ratio of methamidophos achieved 42.9% for 48h, and there also exists fine degradation effect to methane with 68% degrading ratio. Degrading effect of chlorpyrifos by P4 complex differs with different concentration, the higher the concentration, the better the effect, which may arrive at 47% with 20 centigrade. Through field experiments, it has been approved that the aforementioned biological productions had distinct degrading effect to pesticide residual amount in foodstaff after being spraied organic phosphor pesticide. On the second day, degradation ratio of P4 complex for both chlorpyrifos and dimethoate got more than 60% and excessed other coplexes obviously. Meanwhile, the complexes made from seaweeds have no side effect, and can improve the crop qulity. Experiments both in laboratory and in field proved that the biological productions could be employed as a new method for degradating organic phosphor pesticide residual amount in foodstaffs and in applied them to the production of nuisance free food.