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[目的]通过分析评价广西甘蔗种植区的土壤肥力状况,为甘蔗科学合理种植及施肥提供理论依据,并进一步完善广西蔗地土壤肥力评价体系。[方法]对采自广西甘蔗种植区3 006个样点的耕层土壤样品进行养分测定,并采用改进的Nemerow肥力综合指数法评价该基地土壤的肥力特征。[结果]试验结果表明,广西蔗区土壤质地粘重,绝大多数土壤偏酸性,平均值为4.94;土壤有效硼缺乏,平均含量为0.24 mg/kg;土壤交换性镁含量偏低,平均值为62.34 mg/kg;有机质含量一般,碱解N、速效P、速效K、有效铜、有效锌、有效锰、有效钙含量总体处于中等水平,但呈现养分区域不平衡现象与高产土壤条件相比仍有较大差距。改进的Nemerow肥力综合指数法评价结果显示,蔗地土壤肥力为Ⅲ级,即低肥力水平,综合肥力指数为0.56。单项肥力指数有效铜,有效锌,交换性镁,速效,有效锰,碱解氮处于贫瘠水平,其他指标处于一般肥力水平或较高肥力水平。[结论]广西甘蔗种植区土壤肥力总体属于较低水平;采用上述综合评价方法 ,可提高土壤肥力评价的定量化水平和科学性,从而可减少评价过程中主观因素的影响。
[Objective] The research aimed to provide a theoretical basis for scientific and reasonable planting and fertilization of sugarcane by analyzing and evaluating soil fertility in sugarcane planting areas in Guangxi and further improve the evaluation system of soil fertility in sugarcane fields in Guangxi. [Method] The nutrient samples of topsoil collected from 3 006 sampling plots in sugarcane planting area of Guangxi were measured and the soil fertility characteristics were evaluated by the improved Nemerow Fertility Comprehensive Index. [Result] The results showed that the soil texture of Guangxi sugarcane was sticky, most of the soil was acidic, the average value was 4.94; the content of available boron in soil was low, the average content was 0.24 mg / kg; the content of soil exchangeable magnesium was low, Was 62.34 mg / kg. The contents of organic matter, available N, available P, available K, available copper, available zinc, available manganese and available calcium were generally medium. However, There is still a big gap. The results of the improved Nemerow fertility comprehensive index method showed that the soil fertility of sugarcane field was Grade Ⅲ, that is, low fertility level, and the comprehensive fertility index was 0.56. Individual fertility index of available copper, available zinc, exchangeable magnesium, available, available manganese, alkaline hydrolysis of nitrogen at a barren level, the other indicators in the general fertility level or higher fertility levels. [Conclusion] The soil fertility of sugarcane planting area in Guangxi was generally at a low level. Using the above comprehensive evaluation method, the quantification and scientific evaluation of soil fertility could be improved, and the influence of subjective factors in the evaluation process could be reduced.