Ashinie Bogale GonfaEffects of alternate furrow irrigation on physiological response, agronomic performance and physio-chemical quality of tomato cultivars | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
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ISBN: | 978-3-8440-5641-9 | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
Reihe: | Schriftenreihe des Lehrstuhls für Agrartechnik in den Tropen und Subtropen der Universität Hohenheim Herausgeber: Prof. Dr. Joachim Müller Stuttgart | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
Band: | 13,2017 | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
Schlagwörter: | deficit irrigation; water use efficiency; Solanum lycopersicum L.; bio active compounds; total phenol contents; agricultural sciences; agricultural engineering | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
Publikationsart: | Dissertation | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
Sprache: | Englisch | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
Seiten: | 130 Seiten | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
Abbildungen: | 16 Abbildungen | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
Gewicht: | 179 g | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
Format: | 21 x 14,8 cm | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
Bindung: | Paperback | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
Preis: | 30,80 € | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
Erscheinungsdatum: | Dezember 2017 | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
Kaufen: | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
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Zusammenfassung: | Agriculture in the arid and semi-arid regions of Ethiopia is facing imminent water shortage and recurrent drought which has complicated the national effort to alleviate and prevent food insecurity. Demographic growth and climate change will further limit the amount of water available for food production. Therefore, water resources available for agriculture will need to be used more efficiently. Under this circumstance, deficit irrigation such as partial root-zone drying irrigation, also possible to practice as alternate furrow irrigation (AFI) in a surface irrigation system, is thought to be one of the prime tools to optimize irrigation water use in agriculture. This irrigation technique was initially developed to exploit chemical root-to-shoot signaling by imposing soil moisture heterogeneity through alternately applying irrigation water to halves of the root zone. Accordingly, in alternate furrow irrigation (AFI) the water is applied to every other furrow, while the dry furrow received water in the next irrigation. A study was conducted for two consecutive growing seasons (2013 and 2014) in a semi-arid region of Ethiopia to assess the agronomic performance in terms of marketable fruit yield, total fruit yield and water use efficiency as well as physiological and fruit quality responses of four tomato cultivars.
The study indicated that AFI has the potential to save close to 30% of irrigation water relative to full irrigation, greatly improving water use efficiency and some fruit quality without affecting crop productivity. Therefore, the study confirmed that AFI is a suitable deficit irrigation practice in areas with low water availability. The cultivars related differences in water use efficiency under deficit irrigation ascribed from the constitutive differences in stomatal conductance, chlorophyll index, normalized difference vegetation index and relative fruit growth rate. They are suggested as surrogates for screening of genotypes to optimize irrigation water use. The response to deficit irrigation was different among cultivars. Therefore, it can be concluded from the study that optimization of fruit yield and water use efficiency should consider specific-tomato cultivar, not the crop in general, under different deficit irrigation strategies. The study also demonstrated that deficit irrigation could be an efficient strategy for improving the sustainability of water resource use and the health-promoting compounds in tomato fruits by increasing the contents of vitamin C, lycopene, and ?-carotene as well as an antioxidant activity. However, the impact on vitamin C, lycopene, fruit color and total phenol contents appear to be cultivar-dependent. Therefore, the choice of appropriate cultivars under different irrigation techniques is crucial for maintaining or modulating the quality and nutritional contents in tomato, while saving substantial irrigation water. |