Phytotoxic effects of invasive Ageratina adenophora on two native subtropical shrubs in Nepal

AbstractThe response of native plants to allelopathic interference of invasive species may differ from species to species. In this study, the phytotoxic effects of Ageratina adenophora were tested on two native shrubs (Osbeckia stellata and Elsholtzia blanda) of Nepal. Both the shrubs were grown in pots under treatments of A. adenophora fresh leaves and root leachates, and litter. Then, the seedling length and biomass were compared among the treatments. The results show that A. adenophora litter has stimulatory effects but the leachates from fresh leaves and root are phytotoxic to the growth and development of native shrubs. Infrared Spectroscopy (IR) analysis confirmed the presence of O–H (Hydroxyl), N–H (Amines), C≡C (Alkynes), and C–H stretching (Aromatic) or C–O–C stretching (Ethers) in the leachates representing harmful allelochemicals. The invaded soil by A. adenophora had low pH and a high amount of organic matter, total nitrogen, phosphorus, and potassium than the uninvaded soil. The results indicate that the native O. stellata and E. blanda are harmed by A. adenophora in nature by leaching of allelochemicals and probably by reducing the soil pH. Overall, this study has provided valuable insights regarding the effects of A. adenophora invasion on native shrubs and revealing the potential mechanism of its invasiveness.

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Change in physico-chemical properties of soil and nutrients in Desmodium triflorum in case of seasonal variation in Ratnanagar-11, Jirauna, Chitwan, Nepal

International Journal of Scientific Reports ◽

10.18203/issn.2454-2156.intjscirep20174868 ◽

2017 ◽

Vol 3 (11) ◽

pp. 285

Author(s):

Niroj Paudel ◽

Lila Pati Paudel ◽

Prakash Deep Rai ◽

Bishnu Dev Das

Keyword(s):

Seasonal Variation ◽

Rainy Season ◽

Chemical Change ◽

Winter Season ◽

Chemical Properties ◽

Low Ph ◽

Physico Chemical ◽

Phosphorus And Potassium ◽

Nitrogen Phosphorus ◽

Properties Of Soil

Background: Physico-chemical change is described in case of seasonal variation. The plant became grazed in different seasonings; nitrogen, phosphorus and potassium are estimated. The aim of paper is the nutrient uptake of Desmodium triflorum due to the change in season.Methods: The sample is collected as four month interval period the grass is tolerate as low pH. N-1.67–2.04%, P- 0.34–0.61% and K-1.46–4.15%. Results: Soil had lowest concentrations of nitrogen (0.096%), phosphorus (0.004%), and potassium (0.027%) in the rainy season. The highest concentration of nitrogen (0.22%) occurred in summer season, phosphorus (0.005%) in winter and summer seasons, and potassium (0.073%) in the winter season. The carbon/nitrogen (C/N) ratio was highest (15.22:1) in summer and lowest (13.96:1) in the rainy season.Conclusions: Present study will be valuable in evaluation and management of the middle land pastures in Nepal.

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Effects of Water-Nitrogen Interaction on Absorption, Translocation and Distribution of Nitrogen, Phosphorus, and Potassium in Rice

ACTA AGRONOMICA SINICA ◽

10.3724/sp.j.1006.2010.00655 ◽

2010 ◽

Vol 36 (4) ◽

pp. 655-664 ◽

Cited By ~ 6

Author(s):

Yong-Jian SUN ◽

Yuan-Yuan SUN ◽

Xu-Yi LI ◽

Rong-Ping ZHANG ◽

Xiang GUO ◽

...

Keyword(s):

Phosphorus And Potassium ◽

Nitrogen Phosphorus

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Absorption and Distribution of Nitrogen,Phosphorus and Potassium inScutellaria baicalensisGeorgi and Their Relationships to Dry Matter Accumulation

Plant Science Journal ◽

10.3724/sp.j.1142.2012.10079 ◽

2012 ◽

Vol 30 (1) ◽

pp. 79 ◽

Cited By ~ 1

Author(s):

Xian-Yan CAO ◽

Wei-Ling WANG ◽

Fu-Li XU ◽

Jing WANG ◽

Xiao-Hu ZHANG

Keyword(s):

Dry Matter ◽

Dry Matter Accumulation ◽

Phosphorus And Potassium ◽

Nitrogen Phosphorus

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Effects of serpentinite fertilizer on the chemical properties and enzyme activity of young spruce soils

International Agrophysics ◽

10.1515/intag-2016-0015 ◽

2016 ◽

Vol 30 (4) ◽

pp. 401-414 ◽

Cited By ~ 2

Author(s):

Ewa Błońska ◽

Kazimierz Januszek ◽

Stanisław Małek ◽

Tomasz Wanic

Keyword(s):

Enzyme Activity ◽

Chemical Properties ◽

Molar Ratio ◽

Tree Roots ◽

Forest Zone ◽

Negative Effect ◽

Phosphorus And Potassium ◽

One Year ◽

Nitrogen Phosphorus ◽

Experimental Plots

AbstractThe experimental plots used in the study were located in the middle forest zone (elevation: 900-950 m a.s.l.) on two nappes of the flysch Carpathians in southern Poland. The aim of this study was to assess the effects of serpentinite in combination with nitrogen, phosphorus, and potassium fertilizers on selected chemical properties of the soil and activity of dehydrogenase and urease in the studied soils. All fertilizer treatments significantly enriched the tested soils in magnesium. The use of serpentinite as a fertilizer reduced the molar ratio of exchangeable calcium to magnesium, which facilitated the uptake of magnesium by tree roots due to competition between calcium and magnesium. After one year of fertilization on the Wisła experimental plot, the pH of the Ofh horizon increased, while the pH of the mineral horizons significantly decreased. Enrichment of serpentinite with nitrogen, phosphorus, and potassium fertilizers stimulated the dehydrogenase activity in the studied organic horizon. The lack of a negative effect of the serpentinite fertilizer on enzyme activity in the spruce stand soil showed that the concentrations of the heavy metals added to the soil were not high enough to be toxic and indicated the feasibility of using this fertilizer in forestry.

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