南平烟区植烟土壤氯的烤烟适宜指标研究

为探索南平烟区在烟-稻轮作下植烟土壤氯的烤烟适宜指标，通过盆栽和田间试验，研究土壤氯水平对烟株氯含量与其分配、干物质积累及土壤氯变化的影响。结果表明，当土壤氯含量＞10 mg/kg时，烟株氯与土壤氯呈极显著线性正相关；当土壤氯含量＜10 mg/kg时，土壤氯对烟株氯的影响较小。随土壤氯水平提高，烟株干物质积累量呈抛物线型，烟株吸收的氯显著增加，且更多地分配到叶片中。适量施氯，盆栽烟稻轮作后或大田烤烟收获后，耕作层土壤氯含量已降至基本一致的水平，残氯量与施氯量多少无关；犁底层和心土层氯含量却随施氯量增加而极显著增大。南平烟区植烟土壤氯适宜含量指标为25~35 mg/kg。在土壤氯含量平均为(20.22±17.22) mg/kg的现状下，可以施用氯化钾22.5~69.3 kg/hm2，使烤烟种植当季土壤氯含量提高到适宜水平，满足优质烟叶生产需要。

Study on Flue-cured Tobacco Planting Soil Suitable Indicator of Chlorine in Nanping

To explore appropriate indicators of soil chloride in Nanping tobacco-flee rotation areas, effects of chlorine level of tobacco-growing soil on chlorine content of tobacco plants and their distribution, dry matter accumulation and changes in soil chloride were investigated by the pot culture and field experiment. The results showed that： when the soil chlorine content 〉10 mg/kg, the tobacco plants chloride and chlorine soil were very significant linear positive correlation; When the soil chlorine content 〈10 mg/kg, soil chlorine pair tobacco plants chlorine less affected. With soil chlorine levels increased dry matter accumulation quantity was parabolic type, the tobacco plant of the chlorine absorption increased significantly, and more distributed to the leaves. Applying proper amount of chlorine to tobacco plants, potted after tobacco-flee rotation or flue-cured tobacco field after harvest, the soil arable layer consistent chlorine level has dropped, the amount of residual chlorine has nothing to do with the amount of chlorine applied; plow the soil and the heart, but with the applied chlorine and chlorine increased significantly increase. Fujian Nanping suitable chlorine content of tobacco planting soil indicator was 25-35 mg/kg. Average chlorine content in the soil （20.22± 17.22） mg/kg of the status quo, use potassium chloride 22.5-69.3 kg/hm^2, the flue-cured tobacco growing season soil chloride content to the appropriate level, to meet the high-quality tobacco production.