摘要
为研究甘肃陇南地区植烟土壤中交换性镁和烤烟烟叶中镁的含量特征,在陇南烟区点对点采集土壤和烟叶样品进行检测和分析。结果表明:陇南地区植烟土壤交换性镁含量适中占72.4%,含量丰富占27.6%,总体处于适中~丰富水平,交换性镁含量空间分布趋势为由西北和东南部向中部逐渐增加;尽管土壤交换性镁含量丰富,但烟叶中镁含量不足,明显缺乏占2.74%,轻度缺镁占83.56%,在正常范围内仅占13.70%,总体含量偏低;烟叶中的镁与土壤交换性镁、有机质呈显著正相关,与交换性钙镁比呈极显著负相关。土壤中交换性钙镁比偏高,钙镁吸收的拮抗作用,可能为烟叶镁含量偏低的重要原因;采取平衡施肥技术,协调土壤中交换性钙镁比,适当增施有机肥以及追施镁肥是解决陇南烤烟烟叶含量偏低的重要途径。
In order to understand the content of exchangeable Mg in soil and Mg in flue-cured tobacco leaves,the soil and tobacco samples were collected and studied by point to point approach in Longnan. The resultsshowed that: the moderate exchangeable Mg in soil was reached to 72.4%, the abundant content was reached to27.6%, the overall content ranged from moderate to abundant, and the exchangeable Mg content increasedgradually from northwest and southeast to the middle. Despite the exchangeable Mg in soil was rich, Mg intobacco leaves was insufficient, of all the tobacco leave samples, 2.74% of the samples lacked Mg significantly,83.56% of them lacked Mg slightly, and only 13.70% of them had suitable Mg content, so the overall contentwas comparatively low. The Mg in tobacco leaves was significantly positive correlated to exchangeable Mg andorganic matter, and was extremely significantly negative correlated to the ratio of exchangeable Ca to Mg. Thehigher ratio of exchangeable Ca to Mg, and the antagonism between exchangeable Ca and Mg might be animportant reason of low Mg content in leaves. To balance fertilization, coordinate the ratio of exchangeable Caand Mg, increase the application amount of organic fertilizer appropriately and have top dressing of Mgfertilizer are important ways to improve the Mg content in flue-cured tobacco leaves in Longnan.
出处
《中国农学通报》
2015年第4期50-54,共5页
Chinese Agricultural Science Bulletin
基金
甘肃省烟草专卖局2013年重点科研项目"甘肃陇南特色优质烟叶研究与开发"(QYYCKJ2013-001)
关键词
陇南
交换性镁
烟叶中镁
Longnan
exchangeable Mg
Mg in tobacco leaves