Cultivation of broad bean (Vicia faba L.) in an unheated greenhouse

Visoki stroški ogrevanja in ozek nabor rastlin, ki jih je možno pridelovati v neogrevanem rastlinjaku, sta največja razloga zakaj v Sloveniji rastlinjaki pozimi ostajajo neizkoriščeni. Zanimalo nas je, ali bi bilo gojenje boba (Vicia faba L.) skozi zimo v neogrevanih rastlinjakih smiselno tudi z vidika pridelka, ne samo z vidika pozitivnega vpliva na kolobar. Poskus smo zasnovali 22. novembra 2017 v neogrevanem rastlinjaku laboratorijskega polja Oddelka za agronomijo Biotehniške fakultete v Ljubljani. Vključili smo dve sorti, \u27Aguadulce Supersimonia\u27 in \u27Dreifach Weiße\u27. Bob smo sejali na razdaljo 33 × 15 cm. Pri vsaki sorti smo imeli po 6 ponovitev. Tri parcele posamezne sorte smo ob setvi prekrili s kopreno, ostale tri parcele so ostale nezastrte. Ugotovili smo, da prekrivanje ob sajenju sprva pozitivno vpliva na višino rastlin, vendar se tekom intenzivne rasti ta razlika manjša. Tekom poskusa smo merili tudi temperaturo in vlago. Zima je bila sicer toplejša kot dolgoletno povprečje, a mesec februar je bil nadpovprečno mrzel. Rastline kljub temu niso kazale nobenih poškodb zaradi nizkih temperatur. Le pri eni ponovitvi sorte \u27Dreifach Weiße\u27 smo zabeležili 100 % kaljivost semen, a hkrati tudi najmanjšo povprečno višino rastlin. Pridelek v voščeni zrelosti se pri sorti \u27Aguadulce Supersimonia\u27 med pokritim (80,4 kg/100 m2) in nepokritim načinom gojenja (82,3 kg/100 m2) ni dosti razlikoval. Pri sorti \u27Dreifach Weiße\u27 smo na zastrtih gredah izmerili za 25 kg/100 m2 več pridelka kot na nezastrtih gredah. Pridelek v suhi zrelosti se je pri sorti \u27Aguadulce Supersimonia\u27 med načini gojenja razlikoval za 1,1 kg/100 m2, pri sorti \u27Dreifach Weiße\u27 za 26,8 kg/100 m2 in pri obeh sortah smo več pridelka zabeležili na gredah, ki so bile zastrte s kopreno.High heating costs and a limited selection of plants, which can be grown in unheated greenhouses, are the main reasons why these remain unused during the winter months in Slovenia. The aim of the study was to find out if broad bean (Vicia faba L.) could be cultivated in unheated greenhouses through winter in Slovenia and produce sufficient crop. This vegetable would be favorable for sowing also because of the positive effect in crop rotation. The experiment was initiated on November 22nd 2017 in an unheated glasshouse located at laboratory fields of the Department of Agronomy at the Biotechnical Faculty in Ljubljana. Two broad bean varieties were compared: \u27Aguadulce Supersimonia\u27 and \u27Dreifach Weiße\u27. Broad beans were sown at a distance of 33 × 15 cmeach varietyin 6 repetitions. Three plots per each variety were covered with light textile cover, and the rest of the plots were left uncovered. Covered plants exhibited faster initial plant height, but in the course of intensive growth, the difference was reduced. Temperature and humidity were measured during the entire course of the experiment. Winter was warmer than the long-term average, but February was colder than average. Nevertheless, no signs of cold-damage were detected on broad bean plants. 100 % germination rate was only detected in one plot sown with \u27Dreifach Weiße\u27 seeds, but the plants from this plot also exhibited the lowest average plant height. The yield of \u27Aguadulce Supersimonia\u27 variety at milk-wax maturity was comparable among covered (80.4 kg/100 m2 plots) and uncovered plots (82.3 kg/100 m2) However, \u27Dreifach Weiße\u27 variety produced up to 25 kg more crop per 100 m2 if the plots were covered with textile. \u27Aguadulce Supersimonia\u27 dry seeds yield was for 1.1 kg per 100 m2 higher for the covered plots compared to uncovered plots. Higher differences in dry seeds yield were detected in \u27Dreifach Weiße\u27 variety, which produced 26.8 kg more crop per 100 m2 in covered plots