Effects Of Different Conditioner On Chemical Properties And Lettuce Quality Of Soil Containing Chromium-contaminated Soil

Sewage contains nutrients to grow for plants.Sewage irrigation brings nutrients for crop,but also brings harmful substances into the soil.How to use the soil of sewage irrigation,that is the real problem in today’s agriculture.The problem is not be avoided.Cr is one of the most typical and serious elements of soil heavy metal pollution.It brings serious harm to agricultural production,but also poses a great threat to people’s food safety and health.This experiment used biochar,bentonite,biological fertilizer,chicken manure as the improvers.The pot experiment was used the soil from Jianliu village Xiaodian District Taiyuan in Shanxi,that included Cr.In addition,the lettuce is grown on this sewage irrigation soil.The purpose of this study was to investigate the effects of pH,nitrogen content,phosphorus content,potassium content,soil organic matter,Cr’s content in soil,lettuce’s withdraw rate,lettuce’s nitrate,lettuce’s reducing sugar,lettuce’s chlorophyll,Cr’s content in lettuce.In order to get the best treatment effect in the experiment.The main results of the text are as follows:(1)Biochar,bentonite,biological fertilizer,chicken manure can regulate the soil’s Chemical properties.At the same level of addition,chicken manure has a significant regulation effect on pH,nitrogen content,phosphorus content,potassium content.Add different concentrations of chicken manure to the soil,pH decrease obviously in the soil,but nitrogen content,phosphorus content,potassium content were increased significantly.Bentonite added amount are 5.3g/kg and 8g/kg,biological fertilizer added amount are 2.7g/kg and 5.3g/kg and chicken manure added amount are 2.7g/kg,these situations can be improved the soil organic matter.At the same time,when the bentonite added amount is 8g/kg,the soil organic matter is highest.(2)Biochar,bentonite,biological fertilizer,chicken manure can affect Cr’s content in soil.At the same level of addition,biochar added amount are 2.7g/kg,chicken manure added amount are 2.7g/kg and 5.3g/kg,these situations can be decrease Cr’s content in soil,but it is not obvious.When chicken manure added amount is 5.3g/kg,the Cr’s content in soil is lowest.(3)Biochar,bentonite,biological fertilizer,chicken manure can improve the quality and withdraw rate of potted lettuce.These things add to the soil,the lettuce’s withdraw rate,lettuce’s chlorophyll and lettuce’s reducing sugar are increase and lettuce’s nitrate content are decrease.At the same level of addition,lettuce’s chlorophyll are not obvious,lettuce’s reducing sugar and lettuce’s nitrate are obvious.Different soil improver has different optimal add amount,it caused lettuce’s norm differently.When biological fertilizer added amount are 5.3g/kg and 8g/kg,the lettuce’s reducing sugar and lettuce’s withdraw rate are improved.When biochar added amount are 5.3g/kg and 8g/kg,the lettuce’s nitrate is lowest and lettuce’s chlorophyll is highest.(4)Biochar,bentonite,biological fertilizer,chicken manure can affect Cr’s content in lettuce.More and more Biochar,bentonite and chicken manure add to the soil,caused the Cr’s content in lettuce decreased,but they are not obvious.When add to biological fertilizer in soil,the Cr’s content in lettuce is increase and then drop.When biological fertilizer’s added amount is 2.7g/kg,the Cr’s content in lettuce is lowest.