Rose-scented geranium (Pelargonium capitatum×P. radens) growth and essential oil yield response to different soil water depletion regimes

Eiasu, Bahlebi K.; Steyn, J. M.; Soundy, Puffy

doi:10.1016/j.agwat.2009.01.012

Cited by 20 publications

(16 citation statements)

References 20 publications

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“…A number of studies on different crops have also reported a decline in LAI values due to water stress. In their studies, Eiasu et al (2008Eiasu et al ( , 2009) also found that the LAI of rosescented geranium was negatively affected by water stress, with a significant decline in LAI between the well watered control and the water stressed treatments. Laurie et al (2009) found a large reduction in LAI, of about 64-80%, due to reduced irrigation on different sweet potato varieties.…”

Section: Growth Responsementioning

confidence: 90%

Growth of Pelargonium sidoides DC. in response to water and nitrogen level

Mofokeng

Steyn

Plooy³

et al. 2015

South African Journal of Botany

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Water stress is the most limiting factor in agricultural productivity in arid and semi-arid regions and causes very high losses in crop yield. Regulation of growth and stomatal conductance are the main mechanisms by which plants respond to water stress. Pelargonium sidoides is a medicinal plant that grows in South Africa and is used for the treatment of upper respiratory ailments. Cultivation has been considered as a viable means of reducing the pressure on natural populations of this species, but little to no information is available in this regard. Water and nitrogen supply are two of the most important factors that affect growth and yield of plants. This study therefore aimed at investigating the physiological and morphological response, in relation to growth, of P. sidoides to soil water and nitrogen levels. To achieve this objective, P. sidoides plants were grown under a rainshelter and exposed to three irrigation levels (well watered control, moderate water stress, and severe water stress treatment) and four nitrogen levels (0, 50, 100, and 150 kg · N · ha −1 ). Nitrogen and water level had no significant interaction effect on measured parameters. Water stress significantly reduced stomatal conductance, while nitrogen had no significant effect on it. The well watered control had a significantly higher leaf area index, plant height, leaf area, and fresh root yield compared to the water stressed treatments. Nitrogen level had a significant effect on number of leaves, where 100 kg · N · ha −1 had a significantly higher number of leaves compared to other nitrogen treatments. The study provides a first report on the response of P. sidoides to water and nitrogen and showed that the plant responds to water stress by closing its stomata and employing other morphological strategies like reducing plant growth.

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Section: Growth Responsementioning

confidence: 90%

Growth of Pelargonium sidoides DC. in response to water and nitrogen level

Mofokeng

Steyn

Plooy³

et al. 2015

South African Journal of Botany

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“…These factors have therefore been evaluated to determine how they influence the production of volatile compounds in medicinal and aromatic species [8, 13–15]. …”

Section: Introductionmentioning

confidence: 99%

Fertilization and Colors of Plastic Mulch Affect Biomass and Essential Oil of Sweet-Scented Geranium

Silva

Blank

Santos

et al. 2014

The Scientific World Journal

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Sweet-scented geranium (Pelargonium graveolens L'Hér), a plant belonging to the Geraniaceae family, has medicinal and aromatic properties and is widely used in the cosmetic, soap, perfume, aromatherapy, and food industries. The aim of this study was to evaluate the influence of fertilization and the use of different colors of plastic mulch on sweet-scented geranium biomass and essential oil. Three colors of plastic mulch (black, white, and silver-colored) and a control without plastic mulch were assessed along with three fertilizers (20,000 L·ha−1 of cattle manure; 1,000 kg·ha−1 of NPK 3-12-6; and 20,000 L·ha−1 of cattle manure + 1,000 kg·ha−1 of NPK 3-12-6 fertilizer) and a control without fertilizer. The absence of a soil cover negatively influenced the agronomical variables, while coverage with plastic mulch was associated with increased biomass. The use of fertilizer had no effect on the evaluated agronomic variables. When cattle manure and NPK 3-12-6 were used together, combined with white or black plastic mulch, the highest yields of essential oil were obtained. For the silver-colored plastic mulch, higher amounts of essential oil (6,9-guaiadien) were obtained with mineral fertilizer.

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“…The water deficit of the profile was calculated over a soil depth of 1.2 m, but irrigation was based on the upper 0.8 m of the soil profile as the roots of the grass were concentrated in the top 0.7 m. Plant available water (PAW), which is the amount of water that a soil can store and is available for plant water use, was calculated as the difference in soil water content between field capacity and permanent wilting point (USDA, 1998). Plant available water was calculated using methods described in Eiasu et al, (2009). Three N treatments, namely N1: 0 kg N ha -1 , N2: 30 kg N ha -1 and N3:…”

Section: Treatmentsmentioning

confidence: 99%

Forage yield and quality response of annual ryegrass (Lolium multiflorum) to different water and nitrogen levels

Abraha

Truter

Annandale

et al. 2015

African Journal of Range & Forage Science

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Water and nitrogen shortages in annual ryegrass (Lolium multiflorum) production can be improved by using proper irrigation and nitrogen scheduling methods. The aim of this research was to analyse the effect of water and nitrogen application on dry matter production and forage quality of annual ryegrass. Treatments consisted of three irrigation levels, scheduling application to field capacity once every two weeks (W1), once a week (W2) or twice a week (W3) and three nitrogen levels, top-dressing after each harvest at a rate of 0 (N1), 30 (N2) or 60 (N3) kg N h -1 cycle -1 . Yield increased as a function of the amount of water and nitrogen fertiliser applied. The dry matter (DM) content, in vitro organic matter digestibility (IVOMD), crude protein (CP) and metabolisable energy (ME) were higher in the treatments being irrigated once every two weeks. These results conclude that higher irrigation coupled with high nitrogen application significantly improved the dry matter yield, while water stress, to some extent, did improve the quality of the pasture by increasing the DM content, IVOMD, CP and ME values.

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Rose-scented geranium (Pelargonium capitatum×P. radens) growth and essential oil yield response to different soil water depletion regimes

Cited by 20 publications

References 20 publications

Growth of Pelargonium sidoides DC. in response to water and nitrogen level

Growth of Pelargonium sidoides DC. in response to water and nitrogen level

Fertilization and Colors of Plastic Mulch Affect Biomass and Essential Oil of Sweet-Scented Geranium

Forage yield and quality response of annual ryegrass (Lolium multiflorum) to different water and nitrogen levels

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