Lowering Nitrogen and Increasing Potassium Application Level Can Improve the Yield and Quality of Panax notoginseng
| Autor: | Lan-Ping Guo, Xiao-Hong Ou, Da-Hui Liu, Ye Yang, Xiuming Cui, Duanwei Zhu |
|---|---|
| Rok vydání: | 2020 |
| Předmět: |
balanced fertilization
chemistry.chemical_classification photosynthesis biology Chemistry Potassium Saponin Panax notoginseng chemistry.chemical_element Plant Science lcsh:Plant culture yield Photosynthesis biology.organism_classification Nitrogen Animal science saponins Yield (chemistry) nitrogen and potassium Root rot lcsh:SB1-1110 Sugar |
| Zdroj: | Frontiers in Plant Science, Vol 11 (2020) |
| ISSN: | 1664-462X |
| Popis: | Excessive nitrogen (N) application and potassium (K) supplement deficiency is a common problem in Panax notoginseng cultivation. However, synergistic effects of lowering N and increasing K application on yield and quality of P. notoginseng have not been reported. Field experiments in two locations with different N and K combined application were conducted to study the effects on yield and quality. Then, the saponin accumulation mechanisms were explored by pot and hydroponic culture with 2- or 3-year-old seedlings. The investigation showed that 70% of P. notoginseng cultivation fields reached abundant levels of total nitrogen (TN) but had deficient levels of total potassium (TK), which may be detrimental to balance the N/K uptake of P. notoginseng. Moreover, the average biomass was 18.9 g, and P. notoginseng saponin (PNS) content was 6.95%; both were influenced by the N/K values of P. notoginseng. The field experiments indicated that compared to the conventional N and K application (N:K = 2:1), lowering N and increasing K application (N:K = 1:2) decreased root rot rate by 36.4–46.1% and increased survival rate, root biomass, and yield, as well as PNS content by 17.9–18.3, 5.7–32.9, 27.8–57.1, and 5–10%, respectively. The mechanism of lowering N and increasing K application on the PNS content improving was due to the decreasing of N/K value, which promoted photosynthesis, sugar accumulation, and the expression of saponin biosynthesis genes. Therefore, lowering N and increasing K application to the ratio of 1:2 would have great potential to improve the synergistic effect on yield and quality of P. notoginseng cultivation. |
| Databáze: | OpenAIRE |
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