汉中市土壤有效锌的含量分布及影响因素分析OACSTPCD

The aim was to solve the problem of the improper fertilization measures in agricultural production in Hanzhong City,which led to the imbalance of the supply capacity of soil trace elements in some places,and restricted the increase of rice,corn and other grain crops.In this study,6142 soil samples were collected from 11 counties and districts in Hanzhong.The content and distribution of available zinc in soil were analyzed by DTPA extraction atomic absorption spectrophotometer.The results showed that the available zinc content of soil in Hanzhong City was mainly distributed between 0.51-1.0 mg/kg and 1.01-1.5 mg/kg,accounting for 34.80%and 30.80%of the total amount.Soil samples with available zinc content less than 1.5 mg/kg accounted for 78.3%of the total amount,that is,78.3%of the available zinc content of soil in Hanzhong was below the middle level,and 47.4%of the available zinc content of soil was at a low and very low level.The average effective zinc content in the soil of rice and corn producing areas was 1.11 mg/kg,with 1.15 mg/kg in rice cultivation areas and 1.07 mg/kg in corn cultivation areas.The effective zinc content in the soil of rice cultivation areas was higher than that of corn cultivation areas,slightly higher than the average value.The content of available zinc in soil was negatively correlated with soil pH,soil organic matter and available phosphorus.To sum up,available zinc in cultivated soil in Hanzhong could generally meet the needs of crop growth,but in some zinc deficient areas,it was recommended to strengthen the application of zinc fertilizer and manure to reduce the impact of zinc deficiency in soil on crops.