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Zhang X.,Chongqing University of Technology | Wang W.,Chongqing University of Technology | Tan L.,China Tobacco Chuanyu Industrial Co. | Lu J.,Chongqing University of Technology | And 3 more authors.
Tobacco Science and Technology | Year: 2015

In order to reduce the content of starch in flue-cured tobacco leaves, three curing means were tested and compared with current curing means(CK), including low temperature high humidity longer period flue-curing (W), cellulose-aid flue-curing (M) and high temperature-induced amylase pre-activating flue-curing (BK), separately. The starch content in tobacco leaf was determined by iodine colorimetry, and the activity of amylase by 3, 5-dinitrosalicylic acid (DNS) colorimetry. The results showed that: 1) The starch contents in tobacco leaves cured by CK, W, M, BK were 6.54%, 6.06%, 5.08%, 3.13%, respectively. 2) The amylase activity in fresh tobacco leaf was 0.25 U, increased to 0.31 U after curing for 3 hours by CK. For BK, the amylase activity in tobacco leaf pre-activated by high temperature reached 0.49 U, the amylase activity during curing process exhibited a profile with two peaks. High temperature-induced amylase pre-activating flue-curing means reduced the starch content in tobacco leaf more obviously ©, 2015, Editorial Office of Tobacco Science and Technology. All right reserved.

Jiang H.,Chongqing Tobacco Research Institute | Xu A.,Chongqing Tobacco Research Institute | Chen D.,Chongqing Wulong Tobacco Company | Yang C.,Chongqing Tobacco Research Institute | And 2 more authors.
Acta Tabacaria Sinica | Year: 2014

Leaves of Yunyan 97 plants were removed to investigate the effect on root vigor, leaf chlorophyll content and other physiological characteristics. The number of leaves removed were 0, 2, 3 and 4 and yield, grad, economic value were also determined. Results indicated that removing leaves on lower part of plant helped enhancing root vigor, chlorophyll content, net photosynthetic rate (Pn) and transpiration rate (Tr) while delaying photosynthetic function decline. The biggest influence was from removing lower part leaf, followed by middle leaf and upper leaf. At the early stage (10 d), with the increase of number of removed fresh leaf, water use efficiency (WUE) increased. Grad and economic value were greatly improved when removing three leaves. Removing three leaves is the best agronomy practice under the ecological conditions of Wulong county. ©, 2014, State Tobacco Monopoly Bureau and China Tobacco Society. All right reserved.

Hou-Long J.,Henan Agricultural University | Hou-Long J.,ChongQing Tobacco Research Institute | Guo-Shun L.,Henan Agricultural University | Rui W.,Enshi Tobacco Company of Hubei Province | And 2 more authors.
Communications in Soil Science and Plant Analysis | Year: 2012

The spatial variability of soil total nutrient levels, which may be greatly affected by parent material, plays an important role in both agriculture and environment, especially with regard to soil fertility and soil quality. Little research has been done that addresses the spatial characteristics of total nutrients. Soil samples (0-20 cm) were taken from 111 points on an approximately 20-m grid in March 2009 using a global positioning system (GPS) to define sample locations. Sixteen soil total chemical properties were analyzed by classical statistical and geostatistical methods. Soil aluminum (Al), calcium (Ca), chromium (Cr), copper (Cu), nitrogen (N), sodium (Na), silicon (Si), strontium (Sr), titanium (Ti), and vanadium (V) exhibited strong spatial dependence, with the nugget-sill ratios ranging from 3.39% (Na) to 23.53% (Si). Soil barium (Ba), iron (Fe), potassium (K), manganese (Mn), phosphorus (P), and zinc (Zn) had moderate spatial dependence, with nugget-sill ratios of 3.39% to 23.53%. The spatial correlation distances varied from 15.7 m (Zn) to 286.5 m (Cr). The clearly patchy distributions indicated that significant positive correlations among Al, Ba, Fe, K, Mn, Na, Si, Ti, and V led to strong positional similarity. The interpolated maps of the nutrients showed the spatial distributions of the soil variables, which is helpful for better understanding their spatial variability and delineating the potential agricultural management zone. The soil total nutrient distribution maps could be used as the basis for site-specific fertilizer application to improve quality and increase yield of flue-cured tobacco in the study area. © 2012 Copyright Taylor and Francis Group, LLC.

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