Different Measures For The Study Of The Safety Utilization Effect Of Cd Pollution Farmland

In the past 50 years,heavy metal pollutants have entered the environment through various channels,leading to increasingly serious soil environmental pollution,especially Cd pollution is the most serious.The accumulation of Cd in farmland has affected the safety of agricultural products and seriously threatened people’s safety and health.Essence In order to ensure the safety of agricultural product production and achieve the safety of soil Cd pollution farmland,this article uses field rotation tests,and uses wheat straw biological carbon,calcium and magnesium phosphorus fertilizer as soil passivation agent,selenium salt solution is leaf fertilizer,and Shaanxi is Shaanxi.Cd polluting farmland in the provincial and governments is a research object,planting 4 different varieties of wheat and corn,and studying the impact of passivation agent and leaf fertilizer on soil p H,soil fertility,and soil effectiveness Cd.After the research of post-effects,study the impact of the production of passivation agents and leaf fertilizers on different varieties of wheat and corn,as well as the effects of absorbing Cd by the tissue of wheat and corn,and then obtain the best repair method of reducing Cd effects.The main results and conclusions obtained are as follows:(1)The application of passivating agent can improve the p H and fertility of farmland soil,and the passivating agent of biochar is the best,followed by the passivating agent of calcium magnesium phosphate fertilizer.The soil available Cd could be reduced by 4.58%and 5.49%,respectively,when biochar and calcium magnesium phosphate fertilizer were applied in wheat season.Application of biochar and calcium magnesium phosphate fertilizer reduced soil available Cd by 2.65% and 3.70%,respectively.Calcium magnesium phosphate fertilizer has the best effect on Cd reduction.(2)Applying passivation agents to inhibit wheat and corn tissue to accumulate Cd while increasing the output of wheat and corn.In the wheat season,calcium and magnesium phosphorus fertilizer has the best effect of lowering Cd and production.It has a decrease in the Cd of wheat seeds in different varieties of wheat seeds between 15.35%and26.23%,and the output increases between 22.82%and 28.87%.The corn season is still the better effect of calcium and magnesium phosphorus fertilizer passivation agent.It decreases between different varieties of corn seed grains between 15.56%and 36.43%,and the output increase is between 8.46%and 16.01%.Applying leaf surface fertilizer has a tendency to increase the Cd content of crop straw.In the wheat season test,its Cd increased from2.10%to 8.71%on different varieties of wheat straw.In the corn season test,it increases between 2.90%and 6.13%to different varieties of corn straw.Applying leaf surface fertilizer has a good effect on reducing the Cd content of crop grains.The Cd of Xiaoyu 22 wheat seed grains decreases by 20.77%,and the Cd of 958 corn seeds of Zhengdan decreased by 26.13%.In the wheat season test,leaf surface fertilizer combined with calcium and magnesium phosphorus fertilizers decreased to different varieties of wheat seed grains between 20.13%and 39.91%.Cd of corn seeds decreased between 20.28%and43.47%,and Zheng Dan 958 was a low-accumulated variety.(3)In the third season,no passivation agent was used to improve crop yield,soil p H,improve soil fertility,reduce soil available Cd,and inhibit the absorption of Cd by wheat tissues.However,biochar passivation agent still had a good after effect compared with calcium magnesium phosphate fertilizer passivation agent.Continuous application of calcium magnesium phosphate fertilizer passivator in the third season could significantly increase crop yield,soil p H,improve soil fertility,reduce soil available Cd,and inhibit the absorption of Cd by wheat tissues.In conclusion,low-planting varieties,the combination of leaf fertilizer spraying with selenium fertilizer technology and calcium,magnesium and phosphorus technology can not only improve soil p H,improve soil fertility,reduce soil available Cd content,but also reduce grain Cd content to the greatest extent.The increase of soil fertility and the decrease of the toxic effect of Cd on crops can improve the yield of wheat and corn,ensure the safe production of agricultural products,and can be applied to the safe use of farmland soil.