Eficiencia de uso de nitrógeno en el cultivo de papa (Solanum tuberosum L.)

En Túnez, la fertilización nitrogenada de la papa (Solanum tuberosum L.) conjuga la utilización de fertili-zantes minerales con dosis altas, aunque esto no significa alcanzar los rendimientos esperados.  Para evaluar la productividad de papa y la eficiencia de uso de N en el sistema de explotación tunecino se reali-zó un experimento en el Centro Técnico de la Papa y de la Alcachofa (CTPTA), Saïda - Manouba.  Se usa-ron tres tratamientos de N (0, 50 y 200 kg/ha) y tres variedades de papa: Spunta, Bellini e Atlas.  El obje-tivo de este trabajo fue la evaluación de la eficiencia del uso de N en las condiciones agronómicas tuneci-nas del cultivo de papa a partir de la determinación del efecto de distintos dosis de N sobre los parámetros de crecimiento y de desarrollo de la planta y la fijación de la dosis óptima de N que permite el mejora-miento del rendimiento del cultivo.  Los resultados mostraron que los mayores rendimientos y N extraído por los tubérculos se encontraron con las disponibilidades más elevadas de N (200 kg/ha).  El cálculo del coeficiente del uso aparente de N mostró una baja eficiencia del uso de este nutriente.  Con base en el método de la balanza de suministro, la concentración de los nitratos en profundidad fue alta.  El software MABIA-Región fue útil para medir la pérdida de nitratos por drenaje

Nitrogen use efficiency in potato crop (Solanum tuberosum L.)

In Tunisia, nitrogen fertilization of potato combines the use of mineral fertilizers with high doses of N without reaching expected yield. . In order to improve the system productivity of tunisian exploitation, an experiment was conducted at the Technical Center of Potato and Artichoke (CTPTA) Saida - Manouba. Three N treatments (0, 50 and 200 kg ha-1) and three varieties of potato (Spunta, Bellini and Atlas) were used. The aim of this study was to evaluate the efficiency of N use in Tunisian agricultural condition of potato crop as of determining the effect of different doses of N on the parameters of growth and development of potato crop, and fixing the optimal dose of N which allows the improvement of potato crop yield. Results indicated that higher yields and N extracted by tubers were determined with the highest N availability. The calculation of the coefficient of apparent use of N indicated low N use efficiency due to limited N availability. Based on the balance method, the concentration of nitrates in depth was high. The software Mabia-Région showed nitrate the loss of by drainage

Phytochemical characterisation and bioactive properties of Solanum sodomaeum

Introduction: Solanum sodomaeum L. has been observed to have several medicinal properties, in particular, in the treatment of several types of human skin cancer. Objective: The influence of the maturation stage of S. sodomaeum fruits on the total lipid contents, fatty acid profiles, essential oil yields and compositions, as well as the antibacterial and antioxidant activities of the essential oils, was investigated. Methods: The fatty acid and essential oil constituents were identified using gas chromatography (GC) and GC–mass spectrometry (GC–MS). The antioxidant properties of essential oil and vegetal oil were assessed using 1,1-diphenyl-2-picryl-hydrazyl (DPPH) scavenging and reducing power assays. The antibacterial ac-tivity of essential oil was tested using the disc diffusion assay for resistance in human pathogenic bacteria. Results: Mature fruits showed higher total lipid content (17%) and were characterised by polyunsaturated fatty acids (53.87%), represented mainly by linoleic acid (53.11%). Similar yields of essential oils were detected for immature (0.43%) and mature (0.45%) fruits. Tetrahydronaphthalene (41.79%) was detected as the major essential oil component at the immature stage versus dihydrocoumarin pentane (18.27%), hexadecanoic acid (17.43%) and 2-undecanone (13.20%) in mature fruits. The DPPH test showed that essential oils had better antioxidant properties; however, the vegetal oils showed better performance in the reducing power assay. Moreover, the essential oil of S. sodomaeum mature fruits was active against bacterial strains. Conclusions: S. sodomaeum fruits could be a valuable source of natural antioxidants and antibacterial agents

Tunisian grape seed extracts decrease LPS-induced inflammation in murine macrophages

IF 4.066International audienc

Phytochemical characterisation and bioactive properties of Solanum sodomaeum L. fruits at two stages of maturation

Introduction:Solanum sodomaeum L. has been observed to have several medicinal properties, in particular, in the treatment of several types of human skin cancer

Phytochemical characterisation and bioactive properties of Solanum sodomaeum L. fruits at two stages of maturation

Introduction: Solanum sodomaeum L. has been observed to have several medicinal properties, in particular, in the treatment of several types of human skin cancer. Objective: The influence of the maturation stage of S. sodomaeum fruits on the total lipid contents, fatty acid profiles, essential oil yields and compositions, as well as the antibacterial and antioxidant activities of the essential oils, was investigated. Methods: The fatty acid and essential oil constituents were identified using gas chromatography (GC) and GC–mass spectrometry (GC–MS). The antioxidant properties of essential oil and vegetal oil were assessed using 1,1-diphenyl-2-picryl-hydrazyl (DPPH) scavenging and reducing power assays. The antibacterial ac-tivity of essential oil was tested using the disc diffusion assay for resistance in human pathogenic bacteria. Results: Mature fruits showed higher total lipid content (17%) and were characterised by polyunsaturated fatty acids (53.87%), represented mainly by linoleic acid (53.11%). Similar yields of essential oils were detected for immature (0.43%) and mature (0.45%) fruits. Tetrahydronaphthalene (41.79%) was detected as the major essential oil component at the immature stage versus dihydrocoumarin pentane (18.27%), hexadecanoic acid (17.43%) and 2-undecanone (13.20%) in mature fruits. The DPPH test showed that essential oils had better antioxidant properties; however, the vegetal oils showed better performance in the reducing power assay. Moreover, the essential oil of S. sodomaeum mature fruits was active against bacterial strains. Conclusions: S. sodomaeum fruits could be a valuable source of natural antioxidants and antibacterial agents

Biochemical characterization and antioxidant activity of grape ( Vitis vinifera L.) seed oils from nine Tunisian varieties

IF 1.552International audienc