Research of fruit-tree production tecnology

U razdoblju od 2001. do 2005. g., istraživane su šumska ili divlja trešnja, jabuka i kruška. Na području UŠP "Delnice", "Karlovac" i "Sisak" odabrana su i označena matična stabla navedenih vrsta, koja su poslužila za branje plodova, odnosno sjemena. Sakupljeno sjeme je neposredno nakon branja obrađeno, odmah sijano ili stavljeno u stratifikaciju. Sjemenu je određivana klijavost koja je bila za trešnju 10-15%, za jabuku 70-80%, a za krušku 1-2%. Primijenjena su tri načina stratifikacije: a) sjeme je čuvano u polietilenskim vrećicama na 1oC, s 10% vlage 6 tjedana, a zatim je čuvano u hladnjaku na temperaturi 3-6oC; b) sjeme je vlažno smrzavano 2-6 mjeseci izme|u dvaju slojeva vla`nog dravskog pijeska i treseta u omjeru 50:50; c) sjeme je dr`ano na otvorenom tijekom zime. Najbolja klijavost u gredicama postignuta je tretmanom b i sijanjem sjemena nakon dorade tijekom ljeta ili jeseni. Razvoj biljaka u visinu i debljinu bio je prosječno dobar u skladu s podacima iz mnogobrojne literature. Glede slabog uroda u periodu 2001. – 2005. g., i relativno slabu klijavost, trebalo bi nastaviti istraživanje.Fruit trees of forest or wild cherry, apple and pear were investigated in a 2001- 2005 period. Parent trees of the mentioned species were selected and marked on the territory of Forest administration, branch office "Delnice", "Karlovac" and "Sisak". The trees were used for fruit and seed harvesting. Harvested seed was processed immediately after harvesting, and it was immediately sowed or put to stratification. Seed germinability was determined and it was 10-15% for cherry, 70-80% for apple, and 1-2% for pear. Three methods of stratification were applied: a) seed was kept in polyethylene bags at a temperature of 1 oC with 10% humidity for 6 weeks and then it was kept in refrigerator on a temperature of 3-6 oC; b) moist seed was being frozen for 2-6 months between two layers of moist sand from the river Drava and peat in a 50:50 ratio; c) seed was kept in the open during winter. The best germinability in seed-beds was achieved by b treatment and sowing after final processing during the summer or autumn. Height and diameter growth was, on average, satisfactory and in harmony with referential data. Taking into consideration poor yield in a 2001 – 2005 and a relatively poor germinability, the research should be continued