Abstract
The effects of organic and inorganic N combined application on P.notoginseng cultivation are poorly known. For this reason, we have carried out a pot culture experiment in 2010. The treatments respectively were (1) control (no N input, CK), (2) organic N (ON), (3) half organic N and half inorganic N (1/2ON+ 1/2IN), (4) inorganic N (IN). Plant growth, NPK and secondary metabolites concentration were assayed. Results showed that compared to CK, ON increased plant height, N, P concentration and accumulation and total saponins concentration, but reduce total flavonoids concentration. IN increased shoot and root biomass, N concentration and accumulation, K accumulation, but reduce total flavonoids and saponins concentration. 1/2ON+ 1/2IN had the highest hair root length, root diameter, biomass, N concentration and accumulation, K concentration in roots, total saponins concentration, but had the lowest K concentration in shoots, total flavonoids concentration in shoots and roots. Correlation analysis showed total flavonoids concentration was negative correlated with N concentration and accumulation, K concentration in shoots, but was positive correlated K concentration in roots. Total saponins concentration was negative correlated with K concentration in shoots whereas positive in roots, and was negative correlated with total flavonoids concentration. Totally, organic and inorganic N combined application with the ratio of 50/50 is the best way for growth and saponins of P.notoginseng.
Highlights
Nitrogen (N) is one of the main elements required for plant growth and is essential for the synthesis of amino acid, protein and enzyme, etc
Root diameter was significantly increased after N application, and 1/2ON+1/2IN attained the biggest diameter of 21.1 mm, but no significant difference was observed between organic N (ON) and inorganic N (IN) (Fig. 1)
Compared to CK, ON could not increase the biomass of shoots and roots, whereas IN and 1/2ON+1/2IN had a significant increment of shoots and roots biomass with 24.5% and 18.4%, 34.3% and 23.3%, respectively
Summary
Nitrogen (N) is one of the main elements required for plant growth and is essential for the synthesis of amino acid, protein and enzyme, etc. Chemical N fertilizer, as a supplement of nitrogen, has been widely and excessively applied in intensive agriculture system that leads environmental problems and lowly N use efficiency (Ju et al, 2009; Fan et al, 2012), imbalance soil nutrients (Miao et al, 2010), etc. In Kenya maize cultured area, the labor or benefit-costs ratios have not significant difference when organic manures alone is applied or combined with chemical fertilizers, but the combined application has the highest net benefit and improves soil C, N and Ca contents, especially for Ca content improvement (Mucheru-Muna et al, 2007). Soil organic matter is improved by the combined application, thereby to enhance soil DTPA-Zn, Fe and Mn contents (Li et al, 2007)
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