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Yi J.,Tobacco Hunan Industrial Co. | Jia Z.,Tobacco Hunan Industrial Co. | Lin Q.,South China Agricultural University | Lv H.,South China Agricultural University | Shen H.,South China Agricultural University
Allelopathy Journal | Year: 2012

To find the mechanism of soil sickness problem in tobacco continuous cropping, the effects of decaying tobacco leaves and their allelochemicals on the seedlings growth of tobacco were investigated in pot experiments in greenhouse from 2008 to 2010. Results indicated that the decaying tobacco leaves released the allelochemicals (such as benzoic acid and phthalate) and their maximal release occurred 30 to 45-days after incubation. The application of these allelochemicals decreased the activity of antioxidant enzymes (3.9-30.1%) in tobacco roots, reduced the uptake of N, P and K (10.1-37.5%) and inhibited the tobacco growth (27.1-66.3%). Furthermore, the applied allelochemicals also decreased the microbial biomass C and N (13.9-57.5%) and the concentration of available nutrients (9.9-37.2%) in the rhizosphere soil of tobacco seedlings. The magnitude of allelopathic effects followed the order: the mixture of benzoic acid and phthalate > phthalate > benzoic acid > decaying tobacco leaves > control. These results suggested that the decaying tobacco leaves produced allelopathic effects on themselves. After crop harvest, the residual tobacco leaves litter should be removed from the field. Source


Du W.,Tobacco Hunan Industrial Co. | Du W.,Hunan University | Tang L.-J.,Hunan University | Wen J.-H.,Tobacco Hunan Industrial Co. | And 5 more authors.
Talanta | Year: 2015

The study of spatial distribution characteristics of the adsorbed compounds for absorbent materials has significant importance in understanding the behaviors of aerosols while they migrating in the absorbent materials. Herein, for the first time, desorption corona beam ionization-mass spectrometry (DCBI-MS) has proposed for direct in-situ analysis of adsorbed aerosol for absorbent materials. DCBI is a novel atmospheric pressure chemical ionization (APCI)-related technique developed by our group in recent years. It can facilitate accurately localizing sampling by forming a visible thin corona beam and avoid the risk of sample contamination and matrix interference compared with other similar techniques. The advantages of DCBI-MS allow rapid screening of the spatial distribution characteristics of the adsorbed compounds for absorbent materials. The distribution characteristic of phenol in cigarette filter tip filled with cellulose acetate fiber was studied as a model case for demonstrating the feasibility of the developed method. As a comparison, conventional HPLC was also used for the study of the distribution characteristic of phenol. The results revealed DCBI-MS had highly improved assay simplicity in spatial distribution characteristic analysis of phenol for the acetate fiber tip, therefore, exhibiting a great potential for convenient, rapid and cost-efficient analysis of the spatial distribution characteristic investigation of adsorbed compounds for adsorbent materials. © 2014 Elsevier B.V. Source

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