洛南县烟叶氯含量问题的商榷

洛南县是陕西省的一个烤烟生产大县。该县土壤中氯含量过低 ,只有 7.0～ 2 4 .1mg/ kg,限制了烟叶质量的提高。优质烤烟中氯含量理想值为 4～ 6 m g/ g,而洛南烤烟只有 0 .5 3～ 0 .70 m g/ g,相差近 10倍。烟草是忌氯作物 ,但氯又是其生长的必要元素。研究结果表明 ,在洛南烟叶生产中施用氯化钾 6 0～ 90 kg/ hm2 ,能够明显提高烟叶质量且不会引起超量 ,施肥方法以冬翻时配合施入效果最好

Discussions on chlorine content of tobacco leaves in Luonan county

Luonan county is a big leaf tobacco producer in Shaanxi province.Low content of soil chlorine limits the improvement of tobacco quality,which is less than 7.0-24.1 mg/kg.The optimum chlorine content of leaf tobacco ranges between 4-6 mg/g,whereas the chlorine content of the leaf tobacco produced in Luonan county varies from 0.53-0.70 mg/g,the former is about ten times as much as the latter.Tobacco is a kind of crops,which should avoid chlorine,but it needs chlorine in its growth,how to raise the chlorine content of leaf tobacco to the optimum chlorine content as much as possible without surpassing the optimum content can be well solved.According to the research,it is recommended that 60-90 kg of chloride potassium per hectare remarkably improve the quality of leaf tobacco and the fertilizer be plough under soil in combination of winter plowing.