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【目的】为了解赣南脐橙园土壤有效锌含量状况,【方法】在赣南16县随机选取446个脐橙园,分析土壤农化样和背景样有效锌含量、pH值、有机质含量等。【结果】赣南脐橙园背景样和农化样土壤分别有80.78%和90.87%为酸性(pH<5.5),其中强酸性(pH<4.5)土壤分别占30%和44%;95.63%的背景样土壤和80.38%的农化样土壤有机质含量低于15 g.kg-1,农化样土壤有机质平均含量高于背景样土壤;背景样土壤有效锌平均含量仅为1.50 mg.kg-1,农化样为3.09 mg.kg-1;背景样和农化样有效锌不足(<2 mg.kg-1)的果园比例分别为77.29%和58.10%,只有10.92%背景样和16.35%农化样土壤有效锌含量达到适量(2~3 mg.kg-1)水平;土壤有效锌含量与土壤pH值和有机质均呈极显著正相关,有效锌与有效P、有效Cu的相关系数分别为0.420、0.502,呈极显著正相关。【结论】赣南脐橙园背景样土壤和农化样土壤均酸化严重、有机质和有效锌含量普遍偏低,应增施石灰、有机肥和锌肥矫治。
【Objective】 In order to understand the available zinc content in the soil of Gannan navel orange orchard, 【Method】 446 navel orange orchards were randomly selected from 16 counties in southern Jiangxi Province to analyze the contents of available zinc, pH and organic matter in soil samples. 【Result】 The results showed that 80.78% and 90.87% of the background and agro-soils of Gannan navel orange were acidic (pH <5.5), of which 30% and 44% were strongly acidic (pH <4.5), 95.63% The content of organic matter in soils and 80.38% of the soils was less than 15 g.kg-1, and the content of soil organic matter in soils was higher than that of background soils. The average content of available zinc in background soils was only 1.50 mg.kg-1, The agrochemical sample was 3.09 mg.kg-1. The proportions of orchard with or without available zinc deficiency (<2 mg.kg-1) were 77.29% and 58.10% respectively, with only 10.92% background and 16.35% The effective zinc content of soils reached the level of 2 ~ 3 mg.kg-1. There was a significant positive correlation between soil available zinc and soil pH and organic matter. The correlation coefficients of available zinc and available P and available Cu were 0.420 , 0.502, showing a significant positive correlation. 【Conclusion】 The background-like soils and agrochemical soils of Gannan navel orange orchards are all seriously acidified, and the content of organic matter and available zinc is generally low. Therefore, lime, organic fertilizer and zinc fertilizer should be used to treat them.