Nutritivna kvaliteta novozelandskog špinata iz hidroponskog uzgoja pri različitim koncentracijama dušika

master's thesis

• Title (english): The nutritive quality of the New Zealand spinach hydroponically cultivated under different nitrogen concentrations
• Author: Azra Delić
• Mentor: Nadica Dobričević (mentor)
• Committee member: Nadica Dobričević (predsjednik povjerenstva)
• Committee member: Jana Šic Žlabur (član povjerenstva)
• Committee member: Sanja Fabek Uher (član povjerenstva)
• Granter: University of Zagreb; Faculty of Agriculture; (Department of Agricultural Technology, Storage and Transport); Zagreb
• Defense date and country: 2018-05-09, Croatia
• Scientific / art field, discipline and subdiscipline: BIOTECHNICAL SCIENCES; Agronomy

Abstract

Špinat (Spinacia oleracea L.), kao i novozelandski špinat (Tetragonia tetragonoides (Pall.) o. Kuntze syn. (Tetragonia expansa)) nutritivno su vrijedno lisnato povrće. Uz bogat sadržaj vitamina i minerala, ovo lisnato povrće pokazuje i veliki antioksidativni učinak. Špinat je također poznat po akumulaciji dušika, stoga je potrebno paziti tijekom gnojidbe, ali i konzumacije.Za razliku od špinata, novozelandski špinat je u našim krajevima relativno neistraženavrsta, a kao i špinat sadrži značajnu količinu vitamina, minerala i ostalih fitonutrijenata. Iako se navedene vrste uglavnom uzgajaju u tlu, ovo lisnato povrće može se uzgajati i hidroponu poput sustava s plutajućim kontejnerima. Cilj ovog rada bio je utvrditi nutritivnu vrijednost i sadržaj biološki aktivnih spojeva u špinatu i novozelandskom špinatu u plutajućem hidroponu pri različitim koncentracijama dušika u hranivoj otopini. Hranive otopine bile su: standardna otopina, hraniva otopina s koncentracijom 75 mg/LNH4NO3, 140 mg/L NH4NO3 i 205 mg/L NH4NO3. Najveća količina ukupne suhe tvari utvrđena je kod špinata uzgajanog u standardnoj otopini. Od istraživanih bioaktivnih spojeva najveća količina vitamina C utvrđena je kod špinata uzgajanog u standardnoj otopini. Značajno veći sadržaj ukupnih fenola, klorofila, karotenoida te antioksidacijskog kapaciteta pokazuje špinat u odnosu na novozelandski špinat. Špinat pokazuje značajno veće vrijednosti nutritivnog sastava uzgojem u standardnoj otopini, dok se vrijednosti nutritivnog sastava smanjuju povećanjem koncentracije dušika u hranivim otopinama. Novozelandski špinat imao je veće vrijednosti nutritivnog sastava povećanjem koncentracije dušika u hranivim otopinama.

Abstract (english)

Spinach (Spinacia oleracea L.), as well as the New Zealand spinach (Tetragonia tetragonoides (Pall.) o. Kuntze syn. (Tetragonia expansa)), is nutritional valuable leafy vegetable. Alongside with therich content of vitamins and minerals mentioned leafy vegetables are also known to have the significant antioxidant potential. Spinach tends to accumulate nitrogen, therefore should be careful during fertilization and consummation. Unlike the spinach, the New Zealand spinach is in our region relatively unfamiliar and new species, but as well as spinach contains a significant amount of vitamins, minerals and other phytonutrients. Although the above mentioned species are mainly grown in the soil, can also be grown in hydroponic system such as in the floating containers system. The aim of this thesis was to determine nutritional value and content of biologically active compounds in spinach and New Zealand spinach grown in floating hydroponics with nutrient solutions of different nitrogen concentrations in nutrient solutions. The nutrient solutions were: a standard solution, a nutrient solution with a concentration 75 mg/L NH4NO3, 140 mg/L NH4NO3 and 205 mg/L NH4NO3. The highest total dry matter content was determined in spinach grown in the standard solution. From the studied bioactive compounds, the highest amount of vitamin C content was determined in spinach grown in standard solution. Significantly higher content of total phenols, chlorophylls, carotenoids and antioxidant capacity shows spinach compared to New Zealand spinach. Spinach shows considerably higher values of nutritional composition when cultivated in the standard solution, while the nutritional composition values are reduced by increasing the concentration of nitrogen in nutrient solution. New Zealand spinach had higher values of nutritional composition by increasing the concentration of nitrogen in nutrient solutions.

• Keywords: lisnato povrće; plutajući hidropon; dušik; bioaktivni spojevi; pigmentni spojevi
• Keywords (english): leafyvegetable; floating hydroponics; nitrogen; bioactive compounds; pigment compound
• Language: croatian
• URN:NBN: urn:nbn:hr:204:514641
• Study programme: Title: Horticulture; Study programme type: university; Study level: graduate; Academic / professional title: magistar/ magistra inženjer/inženjerka hortikulture (magistar/ magistra inženjer/inženjerka hortikulture)
• Type of resource: Text
• File origin: Born digital
• Access conditions: Open access
• Created on: 2018-06-01 08:46:08