| Analysis of nitrogen uptake and accumulation characteristics of flue-cured tobacco based on planting density |
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| DOI：10.7606/j.issn.1000-7601.2019.03.22 |
| Key Words: flue-cured tobacco plant planting density nitrogen uptake and distribution variety |
| Author Name | Affiliation | | GOU Xiao-mei | College of Resources, Sichuan Agricultural University, Chengdu, Sichuan 611130, China | | SHEN Jie | College of Resources, Sichuan Agricultural University, Chengdu, Sichuan 611130, China | | CAI Yan | College of Resources, Sichuan Agricultural University, Chengdu, Sichuan 611130, China | | HE Yu-ting | College of Resources, Sichuan Agricultural University, Chengdu, Sichuan 611130, China | | WANG Chang-quan | College of Resources, Sichuan Agricultural University, Chengdu, Sichuan 611130, China | | LUO Ding-qi | Sichuan Tobacco Corporation Luzhou Branch, Luzhou, Sichuan 646000, China | | DU Xuan-yan | College of Resources, Sichuan Agricultural University, Chengdu, Sichuan 611130, China
Academy of Agriculture and Forestry Science, Panzhihua, Sichuan 617061, China |
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| Abstract: |
| In order to provide a theoretical basis for optimizing the population structure of local flue-cured tobacco and giving the maximum dense planting effect, a field experiment was adopted to study the effects of different planting densities: 13 890（D1）,15 150(D2),16 660 plants·hm-2(D3) and 18 510 plants·hm-2(D4) on the nitrogen (N) uptake and distribution in Yunyan 97, NC71 and K326 flue-cured tobacco. The results showed that the N content in flue-cured tobacco decreased by 91.10%~180.10% with the growth process and a dynamic exponential function could be used to describe N content variation in the plant. With dense planting, the initial N content of Yunyan 97 and NC71 decreased by 0.07% and 0.14% respectively, while K326 decreased from 4.26% to 4.24% and then increased to 4.30%. Planting density did not significantly impact decreasing rate of N content in K326, however, the N content of Yunyan 97 and NC71 decreased significantly in high dense planting (D4),compared to the control (D1)，the decreasing rate raised by 9.09%(Yunyan97) and 8.26% (NC71). The Dynamic Logistic model showed the time of N rapid accumulation and peak value of N accumulation in dense planting flue-cured tobacco were earlier but at different degrees than that of D1. The start time, termination time of rapid accumulation of nitrogen and maximum N accumulation rate in high dense planted Yunyan 97 (D4)were 7.18 d, 17.26 d and 12.22 d earlier than D1, respectively, and the maximum N accumulation rate increased by 12.46%~34.69%. In different growth stages, the N accumulation significantly increased with increasing planting density before the fast-growing stage, and the dense planting effect was significant, esp. the D4 treatment increasing by 30.65%~314.58%; the N accumulation tended to be stable after the fast-growing stage. With the dense planting, the N accumulation in roots and stems, and lower leaves of flue-cured tobacco significantly increased by 32.67%~49.01% and 42.97%~58.98% than that of D1, respectively, while the N accumulation of middle and upper leaves was limited during the flowering stage. In summary, high-dense of K326 (D4), mid-dense of NC71 (D3), and mid-low density planting of Yunyan 97 (D1 and D2) were optimum planting to the N uptake and photosynthesis to achieve the maximum dense planting effect of flue-cured tobacco. |
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