Influence of fertilization on morphological properties, yield and nutritional value of populations of okra

Bamija (Abelmoschus esculentus L.) je suptropska povrtna kultura, koja se ljeti uspješno može uzgajati u uvjetima kontinentalne Hrvatske. Kao povrde konzumiraju se mladi plodovi koji se beru svakih 3 do 5 dana. Iako se radi o nutritivno visokovrijednoj te ljekovitoj namirnici bamija se rijetko uzgaja u Republici Hrvatskoj te postoji vrlo malo istraživanja vezanih uz sortiment i tehnologiju uzgoja. Cilj ovog istraživanja bio je utvrditi utjecaj različitih genotipa te gnojidbenih tretmana na osnovna morfološka svojstva, prinos i količinu vitamina C mladih plodova bamije. Gnojidba je uključivala tretman komercijalnim 'Siforga' gnojivom, biljnim tradicionalnim preparatima na bazi koprive i gaveza, mineralnim gnojivom NPK formulacije 7-20-30 te kontrolnu varijantu bez primjene gnojiva. Različiti genotip predstavljale su 3 populacije prikupljene na 2 lokacije u Republici Hrvatskoj. Interakcijama tih dvaju faktora nastojao se utvrditi utjecaj na morfološka svojstva bamije (mase, dužine i širine ploda, broj plodova po biljci), tržni prinos i udio ne tržnih plodova te sadržaj vitamina C u plodu. Najmanje pogodna populacija za uzgoj se ispostavila populacija 3 zbog slabog prinosa i manje količine vitamina C, dok populacija 2 pokazuje najbolje karakteristike za uzgoj (broj plodova po biljci, sadržaj vitamina C i tržni prinos ploda).The okra (Abelmoschus esculentus L.) is a subtropical vegetable crop that can be grown in continental Croatia. This vegetables is consumed se young fruits that are harvested every 3 to 5 days. Although it si nutritionally high in value and has a lot of medicinal properties, it is rarely cultivated in the Republic of Croatia and there are not so many research on assortment and cultivation technology. The aim of this study was to determine the influence of different genotypes and fertilizer treatments on the basic morphological characteristics, yields and amount of vitamin C of young okra fruits. Fertilizers included commercial 'Siforga' fertilizer, traditional based plant preparations made from nettle and comfrey, followed by NPK 7-20-30 mineral fertilizer and control variant without fertilizer application. The different genotype represents three population groups collected at 2 sites in the Republic of Croatia. The interactions of these two factors seek to determine the influence on the morphological characteristics of the okra (mass of fruits, length and width of the fruit, number of fruits per plant), market yields and the proportion of non-marketable fruits with the amount of vitamin C in the fruit. The least suitable breeding population turned out to be population 3 due to poor yield and small amounts of vitamin C, while population 2 has the best breeding characteristics (number of fruits per plant, amount of vitamin C and marketable yield of the fruit)