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[Objective] The present paper aimed to study the optimum fertilizer on tobacco cultivation, which would provide a theoretical basis for the reasonable fertilizer application of tobacco leaves in Liangshanyi autonomous prefecture. [Method] Taken Yunyan 87 as tested materi als, the effect of different fertilizer ratios of nitrogen ( N), phosphorus ( P) and potassium ( K) on the leaf biomass, quality components and Cd accumulation of Nicotiana tabacum were studied by pot assay. [ Result]The fertilizer application could not only promote the growth of to bacco and increase the leaf biomass, but also had a positive effect on the accumulation of quality components and the coordination of qnalitative proportion. The contribution efficiency of nitrogen, phosphorus and potassium to plant height and leaf biomass of tobacco was N > P > K. Potassium fertilizer played an important role in the accumulation of potassium in tobacco leaves. The contents of nicotine and total nitrogen were significantly increased, and the coordinated proportion of qnality components was presented under the high level of nitrogen fertilizer. Cd content was an important index to evaluate the qnality and safety of tobacco leaves. The content of Cd in tobacco leaves was in the order of lower leaves > middle leaves > upper leaves. Meanwhile, the abilities of Cd absorption and accumulation of tobacco plants to soil were sig nificantly improved with the high level of combined nitrogen and phosphorus fertilizer, nd storage in tobacco leaves, however, there was no notable influence for potassium fertilizer. [ Conclusion] In summary, the best fertilizer recommended by this pot assay was the treatment of N212K2,when the ration ofN: p: K was 1:0.45:2. 06, average plant height and leaf biomass were 79. 2 cm and 55. 2 g; With 3. 22%,3. 05%,3. 76%,25. 89% and 27. 74% for the content of potassium, nicotine, total nitrogen, reducing sugar and total sugar, respectively, the ratio of sugar and nicotine and the ratio of sugar and nitrogen were 9. 10 and 7. 38, respectively; The Cd contents of lower leaves, middle leaves and upper leaves were 1. S7, 1. 37 and 1. 11 mg/kg, respectively, which was statistically lower the limit level of 3. 0 mg/kg prescribed by the China Tobacco Corporation. It was suggested that this fertilization scheme could be widely applied in various tobacco areas and similar producing areas of Liangshanyi autonomous prefecture. [ABSTRACT FROM AUTHOR]

Copyright of Southwest China Journal of Agricultural Sciences is the property of Editorial Department of Southwest China Journal of Agricultural Sciences and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)

【Objiective】The present paper aims to provide the basis for the protection, artificial domestication and standardized planting of wild Paris plant. 【Method】 The species, distribution and growing environment of wild Paris resources in Hailuogou were investigated by conducting field investigation and specimens identification and consulting relevant aboriginal people. 【Result】The results demonstrated that the 8 taxa of wild Paris, including Paris polyphylla var. chinensis, P. thibetica, P. luquanensis, P. delavayi, P. mairei, P. fargesii, P. polyphylla var. Stenophylla and P. delavayi var. petiolata had been clarified. Most of them grow in evergreen broad-leaved forests, mixed forests and bamboo shrubs at 1600-2400 m above sea level, and the suitable soils are acidic or neutral sandy loam and humus soils. 【Conclusion】The species and number of Paris increase first and then decrease with increasing altitude in the area. Paris polyphylla var. Chinensis is the most widely distributed species in Hailuogou, which is included in the Chinese Pharmacopoeia(2015 Edition), and it can be used for the artificial domestication and large-scale cultivation in the local area. [ABSTRACT FROM AUTHOR]