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Niu Y.,Yuxi Zhongyan Tobacco Seed Co. | Zheng Y.,Yunnan Academy of Agricultural Sciences | Ma W.,Yunnan Academy of Agricultural Sciences | Song B.,Yuxi Zhongyan Tobacco Seed Co. | And 3 more authors.
Acta Tabacaria Sinica | Year: 2014

Experiment was carried out to study oxygen-increasing effects on roots, biomass and agronomic characters of tobacco seedlings in order to solve hypoxia stress in floating system. Calcium peroxide was used to increase oxygen. Results showed that adding calcium peroxide to nutrient solution could increase concentration of dissolved oxygen, raise root vitality, biomass and root-shoot ratio, shorten revival time after transplanting and enhance growth vigor of tobacco plants in field. Results also showed that 450.0 g/m3 calcium peroxide was the best treatment, in which root vitality, biomass of dry weight and root-shoot ratio were higher by 87.5%, 18.8% and 14.15% respectively. Furthermore, revival time after transplanting was shortened by 3 d and height was increased by 12.1 cm.

Guan Y.,Zhejiang University | Cui H.,Yuxi Zhongyan Tobacco Seed Co. | Ma W.,Yuxi Zhongyan Tobacco Seed Co. | Zheng Y.,Yuxi Zhongyan Tobacco Seed Co. | And 2 more authors.
Scientific World Journal | Year: 2014

Drought is one of the most important stress factors limiting the seed industry and crop production. Present study was undertaken to create novel drought-resistant pelleted seeds using the combined materials with superabsorbent polymer, poly(2-acrylamide-2-methyl propane sulfonic acid) (PAMPS) hydrogel, and drought resistance agent, salicylic acid (SA). The optimized PAMPS hydrogel was obtained as the molar ratio of 2-acrylamido-2-methyl-propanesulfonic acid (AMPS) to potassium peroxydisulfate (KPS) and N, N′-methylene-bis-acrylamide (MBA) was 1:0.00046:0.00134. The hydrogel weight after swelling in deionized water for 24 h reached 4306 times its own dry weight. The water retention ratio (RR) of PAMPS was significantly higher as compared with the control. It could keep as high as 85.3% of original weight after 30 min at 110°C; even at 25°C for 40 d, the PAMPS still kept RR at 33.67%. PAMPS disintegration ratio increased gradually and reached around 30% after embedding in soil or activated sludge for 60 d. In addition, there were better seed germination performance and seedling growth in the pelleted treatments with SA-loaded PAMPS hydrogel under drought stress than control. It suggested that SA-loaded PAMPS hydrogel, a nontoxic superabsorbent polymer, could be used as an effective drought resistance material applied to tobacco pelleted seeds. © 2014 Yajing Guan et al.

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