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http://dx.doi.org/10.1016/j.jgr.2015.04.003

Optimal fertilizer application for Panax notoginseng and effect of soil water on root rot disease and saponin contents  

Xia, Pengguo (Shaanxi Research Center of TCM Fingerprint and NP Library, College of Life Sciences, Northwest A&F University)
Guo, Hongbo (Shaanxi Research Center of TCM Fingerprint and NP Library, College of Life Sciences, Northwest A&F University)
Zhao, Hongguang (Tianjin Tasly Modern TCM Resources Co. Ltd.)
Jiao, Jie (Shaanxi Research Center of TCM Fingerprint and NP Library, College of Life Sciences, Northwest A&F University)
Deyholos, Michael K. (Department of Biology, University of British Columbia Okanagan)
Yan, Xijun (Tianjin Tasly Modern TCM Resources Co. Ltd.)
Liu, Yan (Tianjin Tasly Modern TCM Resources Co. Ltd.)
Liang, Zongsuo (Shaanxi Research Center of TCM Fingerprint and NP Library, College of Life Sciences, Northwest A&F University)
Publication Information
Journal of Ginseng Research / v.40, no.1, 2016 , pp. 38-46 More about this Journal
Abstract
Background: Blind and excessive application of fertilizers was found during the cultivation of Panax notoginseng in fields, as well as increase in root rot disease incidence. Methods: Both "3414" application and orthogonal test designs were performed at Shilin county, Yunnan province, China, for NPK (nitrogen, phosphorus, and potassium) and mineral fertilizers, respectively. The data were used to construct the one-, two-, and three-factor quadratic regression models. The effect of fertilizer deficiency on root yield loss was also analyzed to confirm the result predicted by these models. A pot culture experiment was performed to observe the incidence rate of root rot disease and to obtain the best range in which the highest yield of root and saponins could be realized. Results: The best application strategy for NPK fertilizer was $0kg/667m^2$, $17.01kg/667m^2$, and $56.87kg/667m^2$, respectively, which can produce the highest root yield of 1,861.90 g (dried root of 100 plants). For mineral fertilizers, calcium and magnesium fertilizers had a significant and positive effect on root yield and the content of four active saponins, respectively. The severity of root rot disease increased with the increase in soil moisture. The best range of soil moisture varied from 0.56 FC (field capacity of water) to 0.59 FC, when the highest yield of root and saponins could be realized as well as the lower incidence rate of root disease. Conclusion: These results indicate that the amount of nitrogen fertilizer used in these fields is excessive and that of potassium fertilizer is deficient. Higher soil moisture is an important factor that increases the severity of the root rot disease.
Keywords
fertilizer; fitting model; Panax notoginseng; root rot disease; soil moisture;
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