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采集了赣南脐橙产区18个县(市)477个脐橙果园1 405个土壤农化样本、229个土壤背景样本,测定了土壤有效氮和有机质含量,同时分析了果园土壤有效氮的区域分布特征、随土壤类型以及树龄变化的特征。结果表明,不同种植区域果园土壤有效氮含量分布存在较大差异,各区域土壤农化样本有效氮含量平均值在35.53～100.59 mg/kg;不同树龄果园土壤有效氮含量具有一定的规律性,前10年随着树龄增加,土壤有效氮含量逐渐增加,10年后土壤有效氮含量趋于平缓,并有下降趋势;各种植区域果园土壤有效氮含量与有机质含量呈极显著线性正相关,其相关系数(R2)为0.41～0.63。根据赣南地区脐橙园土壤有效氮调查结果,可为生产上合理施肥提供科学依据。
A total of 1 405 soil agro-samples and 229 soil background samples from 477 navel orange orchards in 18 counties (cities) of navel orange producing areas of Gannan were collected and their contents of available nitrogen and organic matter were measured. The distribution of available nitrogen in orchard soil was also analyzed Characteristics, with the type of soil and the characteristics of age changes. The results showed that there were significant differences in the distribution of available nitrogen in orchards in different planting areas. The average available nitrogen content in soil samples from different regions was between 35.53 and 100.59 mg / kg. The contents of available nitrogen in different age orchards had a certain regularity. In 10 years, with the increase of tree age, the content of available nitrogen in soil increased gradually, and the content of available nitrogen in soil tended to be flat after 10 years, with a decreasing trend. There was a significant linear positive correlation between available nitrogen and organic matter in the orchard, The coefficient (R2) is 0.41 to 0.63. Based on the survey results of soil available nitrogen in the navel orange orchard in southern Jiangxi, it can provide a scientific basis for rational fertilization in production.