Pumpkin (Cucurbita pepo L.) is a medicinal plant recently under common cultivation in Iran. The seeds and its products are used in the treatment of some diseases. Due to the lack of information about the intra-row spacing and nutritional demands of the plant a factorial experiment with Randomized Complete Block Design with three replications was planned in Azarbaijan Shahid Madani University Research Field in 2013. The treatments were 5 levels of Urea fertilizer (0, 50, 100, 150, 200 kg/ha nitrogen), and intra-row spacing in 3 levels (30, 60 and 90 cm). The result showed that interaction effects of intra-row spacing and nitrogen treatment had significant effect on some morphological traits such as plant height, number of auxiliary branches and leaf number per plant. Application of 200 kg/ha nitrogen increased the plant height, the number for auxiliary branches and leaves as well as the leaves dry mass, mainly due to the prolonged vegetative growth period and delayed flowering and fruiting. 150 kg/ha nitrogen combined with 60 cm intra-row spacing hold the highest number of female flowers, fruit number and intact fruit number and fruit fresh weight, and the highest dry weight of the intact seeds. The results for some physiological traits showed that interaction effects of nitrogen and intra-row spacing had significant effects on chlorophyll b at the late stages of flowering period and the contents for chlorophyll a and carotenoids were significant at the end of growing season. The highest oil content was recorded in 150 kg/ha nitrogen and 60 cm intra-row spacing. Based on results obtained, 150 kg/ha nitrogen and 60 cm intra-row spacing were the best regime for the production of this plant.Key words: Cucurbita pepo L., nitrogen, intra-row spacing, yield, oil content
IZVLEČEK UČINKI OBRAVNAVANJA Z DUŠIKOM IN MEDVRSTNIH RAZDALJ NA MORFOLOŠKE IN FIZIOLOŠKE LASTNOSTI BUČ (Cucurbita pepo L.)Gojenje buč (Cucurbita pepo L.) kot zdravilnih rastlin je v zadnjem času splošno razširjeno v Iranu. Semena in pripravki iz njih se uporabljajo za zdravljenje različnih bolezni. Zaradi pomankanja informacij o vplivu medvrstnih razdalj setve in potrebah po hranilih na pridelek je bil izveden naključni faktorski poskus s tremi ponovitvami na Azarbaijan Shahid Madani University Research Field v letu 2013. Obravnavanja so obsegala 5 ravni gnojenja z ureo (0, 50, 100, 150, 200 kg N/ha), in 3 medvrstne razdalje setve (30, 60 in 90 cm). Rezultati kažejo, da so imela ta obravnavanja značilen učinek na nekatere morfološke znake kot so dolžina rastlin, število stranskih poganjkov in število listov na rastlino. Uporaba 200 kg N/ha je povečala višino rastlin, število stranskih poganjkov in število listov kot tudi suho maso listov predvsem zaradi podaljšane vegetativne faze rasti in zakasnjenja cvetenja in tvorbe plodov. 150 kg N/ha v kombinaciji s 60 cm medvrstno razdaljo setve je dalo največ ženskih cvetov, največ plodov, največjo maso svežih plodov in največjo maso suhih semen. Rezultati meritev nekaterih fizioloških parametrov so pok...
