中国农学通报2025，Vol.41Issue(27)：36-43,8.
施镁肥对靖西烤烟钙镁养分及柔软度的影响
Effects of Magnesium Fertilization on Calcium and Magnesium Nutrients and Softness of Flue-cured Tobacco in Jingxi
摘要
Abstract
In the main tobacco-planting areas of Jingxi,the soil exhibited high calcium and low magnesium levels,along with a relatively high calcium to magnesium ratio.This led to the magnesium deficiency and chlorosis in tobacco leaves and resulted in smooth and rigid symptoms in flue-cured tobacco.To address this issue,we conducted a comprehensive survey of soil nutrients in the tobacco-planting areas of Huadong and Tongde Township in Jingxi,and generated a spatial distribution map of soil nutrients.To investigate magnesium fertilizer application schemes under different calcium levels,experimental plots with three distinct calcium levels were established:(A:medium calcium,B:medium-high calcium and C:extremely high calcium).Within each plot,four magnesium fertilizer application rates were set up:CK(60 kg/hm2),T1(180 kg/hm2),T2(300 kg/hm2)and T3(420 kg/hm2).The agronomic traits during key growth stages of tobacco,the exchangeable calcium and magnesium in the soil at maturity,the calcium and magnesium contents in tobacco plants,and the softness of tobacco leaves were measured.The results showed that the soils in the main tobacco-planting areas of Jingxi generally presented high calcium and low magnesium levels.The magnesium fertilizer application results indicated that in plots A(suitable calcium)and C(extremely high calcium),the T3 treatment(420 kg/hm2 magnesium fertilizer)significantly increased plant height,leaf number and maximum leaf area of flue-cured tobacco compared with the CK control(60 kg/hm2).There was a significant positive correlation between the magnesium application amounts and the magnesium contents in the leaves and soil exchangeable calcium and magnesium in the plots A and C,a significant negative correlation with the calcium content in the roots of the plot A,the calcium content in the leaves of the plot B,and the calcium content in the soil of the plot C.Increasing the application of magnesium fertilizer enhanced the magnesium content in flue-cured tobacco leaves.The T2 treatment in plots A and C significantly improved the softness of flue-cured tobacco.When the magnesium fertilizer application amount was in the range of 173.58-445.05 kg/hm2,the softness of flue-cured tobacco leaves in all three plots reached a soft category,indicating that magnesium fertilizer application could improve the softness of the flue-cured tobacco leaves.In conclusion,increasing magnesium fertilizer application can enhance both the magnesium content and softness of flue-cured tobacco leaves,thereby alleviating the smooth and rigid symptoms observed in tobacco leaves.Specifically,when the magnesium fertilizer application amount is 300 kg/hm2,the improvement effect of various indicators of flue-cured tobacco is relatively significant.This study provides important soil nutrient data for the improvement of flue-cured tobacco planting in Jingxi and may serve as a scientific reference for tobacco production in other high-calcium regions,which is of great significance for enhancing leaf quality and industrial efficiency.关键词
烤烟/土壤养分/高钙低镁/植物养分/柔软度Key words
flue-cured tobacco/soil nutrients/high calcium and low magnesium levels/plant nutrients/softness分类
农业科技引用本文复制引用
周效峰,李佳琦,张利军,林海东,林小兴,李想,杨细平,胡亚杰..施镁肥对靖西烤烟钙镁养分及柔软度的影响[J].中国农学通报,2025,41(27):36-43,8.基金项目
广西中烟工业有限责任公司科技项目(GXZYCX2023B002). （GXZYCX2023B002）
