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广西主要蔗区土壤和植株养分状况的调查研究
吴圣进; 蓝福生; 罗洁; 黄宁珍; 李锋; 许成琼; 黄涛;   
广西壮族自治区中国科学院广西植物研究所
摘要:
通过对广西九个县(市)的20个蔗区进行调查研究发现:蔗区土壤有机质和全磷(P2O5%)含量普遍很高,平均含量分别达255%和0133%,全氮含量也较高,平均为0121%,而土壤全钾(K2O%)含量普遍处于极低水平,平均仅为0546%;与土壤全量养分含量相反,蔗叶中氮、磷的含量普遍很低,平均含量分别为0891%和0108%,而钾的含量普遍很高,平均达3808%,镁的含量也较低,平均为0187%;蔗叶中氮、磷、钾的含量与产量正相关,但钾含量大于500%时出现相反情况;土壤紧实、后期干旱是影响甘蔗营养水平的重要因素;改善蔗区土壤结构、优化肥料配比、建立蔗区灌溉系统等对改善我区甘蔗营养状况及提高单产具有重要作用。
关键词:  土壤养分  甘蔗  营养状况  
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