Long-term excessive use of fertilizer can cause invalid accumulation of the active ingredient in the soil below the root zone,which can not only affect the economic benefits of fertilizer,but also cause environmental problems.To solve this problem,this experiment used bentonite and five different types of fertilizer as test materials,the simulated soil column experiments were carried out to study the vertical migration of effective elements of the different fertilizer in soil tillage layer,under the effects...
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