Effects of Nitrogen Fertilizer Application at Different Growth Stages on Heavy Metals in Chestnut Orchard Soil
To investigate the impact of nitrogen fertilizer allocation at key growth stages of chestnut trees on soil heavy metal content,varying levels of nitrogen fertilizer were administered during bud sprouting,flowering,fruit expansion,and fruit harvesting periods,with subsequent measurement of Cr,As,Cd,and Pb concentrations in the soil.The results showed that the contents of As,Cd and Pb in the soil at flowering stage,fruit expansion stage and harvesting stage showed an increasing trend,and the content of Cr in soil showed a decreasing trend during three and four fertilization treatments in the key growth stage of chestnut.After evaluating heavy metal pollution in soil,it was determined that the application of nitrogen fertilizer at a ratio of 10∶20∶20∶50 during the germination,flowering,fruit expansion,and harvest periods(N9 treatment)could not result in soil contamination by heavy metals such as As,Cd,Pb,and Cr.However,other treatments might lead to slight pollution by these heavy metals.Therefore,for the purpose of reducing soil heavy metal pollution,it was recommended to apply nitrogen fertilizer at a ratio of 10∶20∶20∶50 during the germination,flowering,fruit expansion and harvest periods.
Chestnutgrowth periodnitrogen fertilizer allocationsoil heavy metal
万方数据
维普
