Effects of irrigation strategies, planting methods and nitrogen fertilization on yield, water and nitrogen efficiencies of safflower

Shahrokhnia, Mohammad Hossein; Sepaskhah, Ali Reza

doi:10.1016/j.agwat.2016.04.010

Cited by 49 publications

(14 citation statements)

References 49 publications

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“…Safflower (Carthamus tinctorius L.) crops is usually intended for production of seeds to oil extraction, which has high quality as human food and potential for biofuel production (DORDAS;SIOULAS, 2008;SHAHROKHNIA;SEPASKHAH, 2016).…”

Section: Introductionmentioning

confidence: 99%

Nitrogen and Potassium in Safflower: Chlorophyll Index, Biometric Characteristics and Water Use Efficiency

et al. 2018

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Safflower crops is usually intended for production of seeds to oil extraction. The objective of this work was to evaluate the chlorophyll index, biometric characteristics and water use efficiency of safflower plants grown under different nitrogen and potassium rates and controlled soil water tension. The experiment was conducted in a greenhouse, in pots containing 8 dm3 of a Oxisol. A complete randomized block experimental design in a 5x5 factorial arrangement was used, with four replications, consisting of five nitrogen rates (0, 60, 120, 180 and 240 mg dm-3) and five potassium rates (0, 50, 100, 150 and 200 mg dm-3). The safflower number of leaves, stem diameter, chlorophyll index, number of capitula, shoot, root and total dry weights, water consumption and water use efficiency were evaluated. Data were subjected to analysis of variance (F test) at 5% of probability and to polynomial regression. The nitrogen and potassium fertilization, as independent factors, affected the safflower plants. The chlorophyll index, biometric characteristics and water use efficiency of safflower showed better responses under nitrogen rates of 82 to 168 mg dm-3. The responses of chlorophyll index, biometric characteristics and water use efficiency of safflower increased 10 to 60% with potassium fertilization.

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Section: Introductionmentioning

confidence: 99%

Nitrogen and Potassium in Safflower: Chlorophyll Index, Biometric Characteristics and Water Use Efficiency

et al. 2018

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“…Ashraf et al (2006) reported that high nitrogen doses cause a decrease in some enzyme activities and thereby the photosynthetic rate decreases. In addition, nitrogen affects the dry matter production of cells by influencing the leaf area development (Shahrokhnia and Sepaskhah 2016).…”

Section: Introductionmentioning

confidence: 99%

Influence of different irrigation and nitrogen levels on crude oil and fatty acid composition of maize (<em>Zea mays</em> L.)

et al. 2017

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SUMMARY:The effect of irrigation and nitrogen fertilizer levels on the crude oil and fatty acid composition of maize cultivars was studied. Three levels of irrigation (50, 75 and 100% of field capacity) and nitrogen (100, 200 and 300 kg·ha -1 ) were used for treatment groups. After harvest, the crude oils were extracted and fatty acid profiles were determined by Gas Chromatography system. The study was repeated for two years and the interaction effects of fertilizer and irrigation were determined. Our results show that the crude oil content was affected positively by the fertilizer and the irrigation applications. As expected, the most abundant fatty acid was linoleic and the harvest year did not alter it. The highest linoleic acid content value was obtained with a 50% field capacity and 300 kg·ha -1 fertilizer treatment combination. In addition, fatty acid contents varied with the changing of interaction effects except for myristic and palmitic acid. Oleic acid was the second abundant fatty acid in the oil samples and the lowest oleic acid value was obtained with a 50% field capacity and 300 kg·ha -1 fertilizer treatment combination. Oleic acid content tended to increase with 75% field capacity but 100% field capacity treatment decreased in it.KEYWORDS: Fatty acid profile; Fertilizer; Irrigation; Maize; Zea mays L. RESUMEN: Influencia de niveles de riego y nitrógeno en la composición del maíz (Zea mays L.). Se estudió el efecto de niveles de riego y fertilizantes nitrogenados sobre la composición de aceites y ácidos grasos de cultivares de maíz. Se utilizaron tres niveles de riego (50, 75 y 100% de capacidad de campo) y nitrógeno (100, 200 y 300 kg·ha -1 ) para los grupos de tratamiento. Tras la cosecha se extrajeron los aceites y se determinó el perfil de ácidos grasos mediante cromatografía de gases. El estudio se repitió durante dos años y se determinó los efectos de la interacción del fertilizante y el riego. Los resultados mostraron que el contenido de aceite se ve afectado positivamente por el fertilizante y las aplicaciones de riego. Como era de esperar, el ácido graso mayoritario fue linoleico y el año de cosecha no lo altera. El mayor contenido de ácido linoleico se obtuvo con riego del 50% de la capacidad de campo en combinación con fertilización de 300 kg·ha -1 . Los contenidos de los demás ácidos grasos varían con los cambios de interacción riego/fertilización, excepto los ácidos mirístico y palmítico. El ácido oleico fue el segundo ácido graso más abundante en los aceites y su valor más bajo se obtuvo con la combinación de una irrigación del 50% de la capacidad de campo y 300 kg·ha -1 de fertilizantes. El ácido oleico tiende a aumentar con una irrigación del 75% de la capacidad de campo, pero el 100% del tratamiento de capacidad de campo lo hace disminuir.

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“…Sustainable water use mainly depends on agriculture water use. Therefore, developing a proper agricultural water management system is necessary (Shahrokhnia and Sepaskhah, 2016). Subirrigation systems have been developed to enable the more economic use of water and fertilizer, enhance crop production efficiency, and maintain crop yield.…”

Section: Discussionmentioning

confidence: 99%

Ebb-and-flow Subirrigation Strategies Increase Biomass and Nutrient Contents and Reduce Nitrate Levels in Lettuce

Yang¹,

Yang²,

Zhao³

et al. 2018

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Overhead irrigation is widely used to water lettuce during commercial production in China but exerts potential water wastage and pollution. Subirrigation is thought as a water-saving, high-efficiency fertigation strategy. However, few studies have compared the nutritional value and nitrate content of lettuce grown using subirrigation with plants cultivated with overhead irrigation. Therefore, this study explored the ability of ebb-and-flow subirrigation strategies to produce high yields of a leafy lettuce (cultivar Biscia Rossa) with high nutritional value and low nitrate content. Lettuce plants were cultivated in an ebb-and-flow subirrigation system with different irrigation frequencies (every 2 or 3 days) and immersion times (5, 10 or 15 minutes); overhead irrigation was used as control. Ebb-and-flow subirrigation significantly enhanced several lettuce growth parameters, significantly increased the level of vitamin C, and significantly decreased the nitrate content of lettuce leaves compared with overhead irrigation. The optimal subirrigation strategy for lettuce production was irrigation every 3 days with 15 minutes immersion; this ebb-and-flow subirrigation protocol could potentially be used to save water and resources, improve yield and nutrient contents and reduce nitrate content in commercial greenhouse lettuce production.

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Effects of irrigation strategies, planting methods and nitrogen fertilization on yield, water and nitrogen efficiencies of safflower

Cited by 49 publications

References 49 publications

Nitrogen and Potassium in Safflower: Chlorophyll Index, Biometric Characteristics and Water Use Efficiency

Nitrogen and Potassium in Safflower: Chlorophyll Index, Biometric Characteristics and Water Use Efficiency

Influence of different irrigation and nitrogen levels on crude oil and fatty acid composition of maize (<em>Zea mays</em> L.)

Ebb-and-flow Subirrigation Strategies Increase Biomass and Nutrient Contents and Reduce Nitrate Levels in Lettuce

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