Study On The Transport Of Cd(?),Pb(?)in Soil And Plant System And The Effect Of Plant Growth With Waste Paper Fertilizer

In our country,waste paper recycling is not high efficient,most are used for recycled paper.But the environmental pollution has been higher than the economic value created by the paper in the process of recycling paper,and more environmentally friendly paper-making process does not cover the country.So we look for new ways to deal with waste paper.Waste paper will be made into a reusable organic fertilizer by chemical treatment.Cd²⁺ is one of the most toxic heavy metal elements,widespread in nature.Source of Cd²⁺ in the soil is divided into natural and anthropogenic sources.The former is mainly from background values in rocks and minerals.The latter is mainly from the industrial "three wastes" and the widespread application of Cd²⁺ containing fertilizers.,The potential toxicity of Cd²⁺ only after mercury in all heavy metal elements;but Cd²⁺ pollution is more likely to have a great risk.Plants can absorb the soluble state Cd²⁺ in the soil and they will appear toxic symptom when Cd²⁺absorbed into the plants and accumulated to a certain extent.The plants will appear toxic symptom.Pb²⁺ hazards to human health,it can accumulate in the body and cause Pb²⁺poisoning.The toxicity of Pb²⁺ poisoning is concealed and quite slow,not easy to perceive.The main source of Pb²⁺ in the human body is from food.In the form of Pb²⁺smoke and dust enters the body through breathing is another source of Pb²⁺.Pb²⁺pollution levels of the same vegetables in different environments are different.There are many ways of pollution.At present,how to remove the Pb²⁺ and Cd²⁺ effectively from the contaminated soil has become a problem and caused the scientists' common attention.Phytoremediation technology gets more and more attention with its potential high efficiency,cheap and environmental friendly.We research that how the organic fertilizer influences on the growth of plants in the soil containing different concentration of heavy metal and analyze the transport of Pb²⁺and Cd²⁺ in soil and plants system.The newspaper debris generated cellulosenitrate or nitrocellulose match in the reaction of nitric acid and cellulose in the fertilizer production process.Undissolved feature fertilizer can effectively prevent the loss of nutrients.The specific surface area of fertilizer was 43.2 m2/g,as measured by the N²-BET method.High surface area is increased contact with the soil and fertilizer plant roots,improve the efficiency of the plants absorb fertilizer.It can save more durable in the soil.The Fourier transform infrared spectra of the fertilizer showed that it contained many syringy units and carboxyl groups.Fertilizers and lignin hydrolysis unit lilac consistent,It is easy to combined with certain nutrients in the soil.The plant is more conducive to the absorption of fertilizer and soil nutrients.Fertilizer extent on vegetable physiology and nutrition indicators is closely related to the concentration of fertilizer.Two kinds of vegetables photosynthetic pigment content increased gradually with increasing concentrations of fertilizer.When the fertilizer concentration is 5 g/kg,content of photosynthetic pigments is the highest.Compared with cabbage,radish photosynthetic pigments smaller changes.Fertilizer applied to promote the synthesis of photosynthetic pigments to enhance the ability of plant photosynthesis.Vitamin C content as fertilizer concentration,showed a gradual decline,but still higher than the control group.The best concentration of the fertilizers to improve the vitamin C content is 1 g/kg.In comparison,the vitamin C in cabbage is more sensitive to fertilizer concentration.than the vitamin C in cabbage.Applying fertilizer can significantly increase the total amount of free amino acids and soluble protein production in cabbage and radish.The higher the concentration of fertilizer,the more obvious role in promoting.Making further improved the nutritional quality of vegetables.At low concentrations of fertilizer,nutrient content in vegetables than the control group increased slightly.Nutritional quality of two kinds of vegetables by fertilizer impact comprehensive comparison,fertilizers have a greater impact on the nutritional quality of cabbage.4 categories of indicators compared to the magnitude of the change,the soluble protein affected by the concentration of fertilizer most.Followed by the order of photosynthetic pigments,free amino acids and vitamin C.Waste paper is produced into fertilizer in this experiment.We research that how the fertilizer influences on the growth of plants in the soil containing different concentration of heavy metal and analyze the transport of Pb²⁺and Cd²⁺ in soil andplants system.The root tolerance index?RTI?and transport factor?TF?of plants were analyzed,The Pb²⁺and Cd²⁺ pollution inhibited the growth of plant roots.The contents of the Pb²⁺and Cd²⁺ in plant roots and shoots were measured.The results show that the Pb²⁺and Cd²⁺ contents of roots were higher than shoots.In the case of Pb²⁺and Cd²⁺pollution,the use of fertilizers promote plant root uptake of Pb²⁺and Cd²⁺.With increasing concentrations of fertilizer,Pb²⁺and Cd²⁺ inhibition root growth of plant did not change significantly.Fertilizer promoted the growth of shoots of plants.As the fertilizer concentration was 3 g/kg,the promoting effect was the highest.Whether heavy metals added,fertilizer applied to the root of vegetable has a role in promoting the absorption of heavy metals in different degrees.As fertilizer concentration is 3g/kg,the most significant role in promoting.The content of heavy metals in the soil at different depths is different.It is related to the length of the root of vegetables.The content of heavy metal is relatively low at the depth of the root length.The content of heavy metal in soil showed the following trend,the middle?underground 6 cm?>upper?underground 3 cm?> lower?underground 9 cm?.Waste newspaper was created to the fertilizer which conducives to plant growth by the way of chemical in this topic.Not only opening new avenues to deal with waste newspaper,but also providing an economical and effective fertilizer for agriculture.