20.500.12556/RUL-128720 Vpliv koncentracije dušika v hranilni raztopini na pridelek in kakovost listnate zelenjave, gojene na hidroponskih tekočinskih sistemih Effect of nitrogen concentration in nutrient solution on yield and quality of leaf vegetables, grown on hydroponic liquid systems Hidroponika je vse bolj pomembna tehnika za pridelavo zelenjave. Velika in pomembna težava hidroponike je v tem, da lahko nekatere rastlinske vrste hitro kopičijo visoke vsebnosti nitrata. Pridelava vrtnin v rastlinjakih še vedno bolj razvija v smeri trajnostnih ali okolju prijaznih sistemov, vendar pa je ob tem potrebno ohraniti količinsko in kakovostno zadovoljiv pridelek. Uporaba plavajočega hidroponskega sistema za pridelavo listnate zelenjave se povečuje, vendar univerzalna sestava hranilne raztopine še ni na voljo. Hidroponski sistemi so pomembno orodje za rastlinsko pridelavo v zaprtih prostorih, tudi v t.i. rastlinskih tovarnah, kjer rastline umetno osvetljujejo. Med različnimi hidroponskimi sistemi se za gojenje listnate zelenjave uporabljajo sistemi, kjer hranilna raztopina kroži, t.i. zaprti sistemi. V tržne namene se za pridelavo zelenjave uporabljajo plavajoči sistem in NFT sistemi. Ker se koncentracije ionov v hranilnih raztopinah s časom spreminjajo, kar povzroča neravnovesje hranil, so za uspešno rast potrebni sistemi za nadzor hranil, ki sproti merijo njihovo koncentracijo. Vendar takšni sistemi še niso na voljo za komercialno uporabo. Z uravnavanjem hranil v hranilni raztopini, predvsem dušika, pa uspešno zmanjšamo količino nakopičenega nitrata v listnati zelenjavi. To lahko naredimo tako, da zmanjšamo koncentracijo dušika v hranilni raztopini nekaj dni pred pobiranjem, ali dodamo organske spojine, npr. aminokisline. Kot učinkovit ukrep zmanjšanja nitrata v listih zelenjave, pridelane v hidroponskem sistemu, se je izkazalo tudi uravnavanje nekaterih elementi, kot so žveplo, železo, silicij in selen. Hydroponics is an increasingly important area of vegetable production. A major and important problem of hydroponics is that some plants can rapidly accumulate high levels of nitrate-N. Greenhouse production is still evolving towards sustainable or environmentally friendly systems. However, the yield and quality of vegetables must be maintained. The reduction of fertilizers must be achieved without compromising market yield. Floating systems for the production of leafy vegetables are increasing, but adequate concentrations of nutrient solution are not yet available. Hydroponic systems are a key tool for indoor plant production, such as artificial lighting plant factories, nutrient film technique (NFT) is commercially used among various hydroponic systems with circulating nutrient solutions. As ion concentrations in nutrient solutions change over time, resulting in nutrient imbalances, nutrient monitoring systems that measure their concentration are required for successful growth. However, such systems are not yet available for commercial use. By regulating the nutrients in the nutrient solution, especially nitrogen, we successfully reduce the amount of nitrate accumulated in leafy vegetables. This can be done by reducing the nitrogen concentration in the nutrient solution a few days before harvesting, or by adding organic compounds, e.g. amino acids. The regulation of some elements, such as suphur, iron, silicon and selenium, has also been shown to be an effective measure to reduce nitrate in the leaves of vegetables grown in the hydroponic system. hidroponika dušik hranilne raztopine nitrati vsebnost nitratov esencialni elementi hydroponics nitrogen nutrient solutions nitrate content essential elements true false false [S. Jusufoski] Slovenski jezik Angleški jezik Diplomsko delo/naloga 2021-07-24 07:15:04 2021-07-24 07:15:08 2022-09-07 04:16:49 0000-00-00 00:00:00 2021 0 Ljubljana 0 0000-00-00 NiDoloceno NiDoloceno NiDoloceno 0000-00-00 0000-00-00 0000-00-00 631.589.2:631.811.1:631.84:631.559(043.2) 191501 72119299 15437.pdf 15437.pdf 1 44A9510F9CF806A1B953F27612ECFB56 c09ee58fae0b44b30aa6a99ab7c671f403738396b3bd9544448afeafb0a16c2f f3f9f6b4-ec3d-11eb-a523-00155dcfd717 https://repozitorij.uni-lj.si/Dokument.php?lang=slv&id=145554 Biotehniška fakulteta 0 0 0