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- Title
Nitrogen uptake and allocation characteristics of flue-cured tobacco in Nanxiong tobaccoplanting area of Guangdong Province.
- Authors
YANG Zhi-xiao; LIU Hua-bing; KE You-song; WU Wen-bin; ZHANG Xiao-quan; QIU Miao-wen; ZHAO Wei-cai; YANG Tie-zhao
- Abstract
By the method of field in situ culture and 15N isotopic tracer technique, and taking fluel-cured tobacco (Nicotiana tobacum) cultivar K326 as test material, a field experiment was conduc- ted in the Nanxiong tobacco-planting area of Guangdong Province to study the characteristics of soil nitrogen (N) mineralization, the patterns of N accumulation and allocation in tobacco plants, and the allocation of plant-absorbed fertilizer N applied in current growth season. In the study area, the amount of soil mineralized N increased with tobacco growth, peaked at 75 days after transplanting, and decreased thereafter. The soil mineralized N at each tobacco growth stage was significantly higher in the control than in the N fertilization treatment. The N accumulation in tobacco plant organs was in the order of leaf > stalk > root. Tobacco plants mainly absorbed fertilizer N at rosette stage and topping stage, and mainly absorbed soil N at mature stage. The absorbed N in tobacco whole growth period was mainly derived from soil N, and the absorbed soil N and its proportion to the total absorbed N increased evidently with extending growth stage and ascending leaf position. The fertilizer N use efficiency per plant and the residual rate and loss rate of applied fertilizer N were 30.8%, 32.3%, and 36.9%, respectively. In the study area, soil N mineralization rate was relatively high, and soil N had greater effects on the quality of upper tobacco leaves. Under the application rate of 150 kg N·hm-2, the residual amount and loss amount of applied fertilizer N were relatively high.
- Subjects
GUANGDONG Sheng (China); CHINA; STABLE isotope tracers; FLUE-cured tobacco; CULTIVARS; EXPERIMENTAL agriculture; NITROGEN in soils
- Publication
Chinese Journal of Applied Ecology / Yingyong Shengtai Xuebao, 2011, Vol 22, Issue 6, p1450
- ISSN
1001-9332
- Publication type
Article