广西桑园土壤铁养分状况研究

目的]研究广西桑园土壤铁养分状况及影响铁有效性的因素,为有效预防桑树缺铁失绿症提供理论依据。方法]通过田间调查研究和化验分析对广西桑园土壤铁及其他养分含量进行测定,并进行统计分析。结果]广西桑园土壤全铁的平均含量为3.57%,有效铁为32.40mg/kg;水田桑园土壤有效铁含量为13.57mg/kg,是旱地桑园的30.28%;棕泥田有效铁含量最低;黄化桑园土壤有效铁仅为正常桑园的38.95%;土壤有效铁与pH值、HCO3-、有效钙、有效镁呈极显著的负相关,与速效钾呈显著的负相关,与速效磷呈极显著的正相关。结论]广西桑园土壤有效铁含量大部分属于适量以上,但区域分布极不均匀,部分地区土壤有效铁含量较低,石灰性水田桑园容易发生桑树缺铁失绿症。

Nutrient Status of Iron in Mulberry Soil in Guangxi

Objective]The research aimed to investigate the status of nutrient iron in Guangxi mulberry field and the impacting factors on iron availability,so as to provide a theoretical basis to effectively prevent the mulberry chlorosis caused by iron deficiency.Method]Soil samples of mulberry field were collected in field survey,nutrient iron and other nutrients were measured by chemical analysis,and the measurements were analyzed in statistical method.Result]The average content of total iron in Guangxi mulberry field was 3.57%,the average content of nutrient iron was 32.40 mg/kg;the average content of nutrient iron in mulberry paddy was 13.57 mg/kg,which was 30.28% of the nutrient iron content in mulberry dryland.The lowest nutrient iron content was present in brown dorota.The nutrient iron content in etiolated mulberry field was only 38.95% of the content in normal mulberry field.The nutrient iron had a highly significant negative correlation with pH value,HCO3-,nutrient calcium,and nutrient magnesium,and it had a significant negative correlation with available potassium,and it had a highly significant positive correlation with available phosphorus.Conclusion]The nutrient iron content in Guangxi mulberry field was mostly above the appropriate level,but the regional distribution was uneven,the nutrient iron content was very low in some area,and the calcareous paddy was prone to occurred mulberry iron deficiency chlorosis.