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Accueil du site → Doctorat → Portugal → Effect of innovative crop management practices on physiological, nutritional and phytochemical characteristics of almond tree (Prunus amygdalus L.) products and coproducts

Universidade de Tras os Montes E Alto Douro (2019)

Effect of innovative crop management practices on physiological, nutritional and phytochemical characteristics of almond tree (Prunus amygdalus L.) products and coproducts

Prgomet, Iva

Titre : Effect of innovative crop management practices on physiological, nutritional and phytochemical characteristics of almond tree (Prunus amygdalus L.) products and coproducts

Auteur : Prgomet, Iva

Université de soutenance : Universidade de Tras os Montes E Alto Douro

Grade : Ph.D. thesis - Agricultural Production Chains - From Fork to Farm 2019

Résumé
Agriculture is facing serious challenges, from the climate change contributing to water scarcity due to higher average temperatures and uneven events of drought and floads, to the growing population what increases the water and food demand, and at the same time generates substantial amount of agro-waste. Almond (Prunus dulcis (Mill.) D.A. Webb) is the worldwide most produced tree nut as it is following the increasing trend in world demand for almond products, due to its nutritional properties being recognized as beneficial for health. As it is fruit species grown in semiarid areas of Mediterranean Basin that are greatly affected by changes in environmental conditions, there is an existing need for increased sustainability and competitivness of the almond sector. The overall objective of this Doctoral Thesis therefore is to contribute to boost the almond production chain in semiarid areas by different approaches, focusing on determination of the suitability of almond by-products for use as a source of bioactive compounds to gain a complete evaluation of the valorisation alternatives for almond by-products. Furthermore, it is aimed gaining a further insight in the agricultural management strategies by understanding the plant physiological and biochemical response, enhance almond quality, environmental sustainability and economical viability for almond production in semiarid areas. In that regard, the experiment consisted of treatments based on the crop evapotranspiration (ETc) : optimal water requirement regime T100 (applying the 100% of ETc) ; deficit irrigation regimes T70 and T30 (applying the 70% and 35% of ETc, respectively) ; regulated deficit irrigation : T100-35 (100% ETc during fruit development, reducing the application to 35% ETc during fruit filling) ; rainfed T0 (rainfed) ; and kaolin application to rainfed trees (T0Kaolin), during 2015 and 2016 seasons, on 15-years old almond trees of variety ‗Ferragnès‘ located in Northern Portugal. The impact of treatments on almond by-products, kernel quality and plant behaviour, was assessed. To achieve this aim several actions were undertaken involving field trials and phytochemical, microbial, nutritional, physiological and biochemical approaches. To get new insights on reduction of agro-residues upon harvest and industrial processing, the phenolic extraction of almond byproducts was successfully optimized using the Response Surface Methodology (RSM) for the non-toxic, food grade ethanol pH, concentration and extraction time.

Présentation

Page publiée le 17 avril 2020