| Abstract (croatian) | U radu se prikazuju trogodišnji rezultati pošumljavanja jednogodišnjim (1+0) i školovanim (1+1) sadnicama divlje kruške. Pokusi su osnovani na neobrasloj površini u odsjeku 5b G. J. Dubrava-Mokrice, kojom gospodari Šumarski fakultet Sveučilišta u Zagrebu. Tlo je pseudoglejno, a nadmorska visina iznosi od 125–130 m. Istraživano je preživljenje, visinski i debljinski rast, broj primarnih grana i vitalitet sadnica. Školovane sadnice pokazale su bolje preživljenje u odnosu na neškolovane. Razlika u preživljenju u korist školovanih sadnica povećava se s brojem vegetacija na terenu, odnosno starosti sadnica (9,9%, 10,9%, 12,3%). Kod neškolovanih sadnica evidentirano je u prosjeku 1,57 % veće odumiranje vršnog izbojka. Nakon tri vegetacije na terenu, prosječna visina neškolovanih sadnica iznosila je 762 mm (360–1640 mm), a školovanih 1142 mm (520–2050 mm). Prosječni promjer vrata korijena neškolovanih sadnica iznosio je 12,15 mm (5,71–22,80) a školovanih 15,36 mm (6,49–26,29). Utvrđene su statistički značajne razlike u visinama sadnica s obzirom na tretiranja, datume mjerenja i datum*tretiranje, odnosno u slučaju promjera vrata korijena s obzirom na tretiranja i datume mjerenja. Školovane sadnice imale su prosječno 392 mm veću visinu i 3,28 mm veći promjer vrata korijena od neškolovanih i statistički su se značajno razlikovale. Utvrđena je statistički značajna razlika u visinama i promjerima vrata korijena neškolovanih i školovanih sadnica u svim datumima mjerenja. Pri kraju četvrte vegetacije na terenu, školovane sadnice imale su prosječno više primarnih grana za razliku od neškolovanih, dok je prosječni vitalitet bio podjedanak. Pošumljavanje sadnicama divlje kruške moguće je obaviti neškolovanim i školovanim biljkama, no zbog ekonomičnosti u rasadničkoj proizvodnji i kod pošumljavanja, uporabu većih i starijih sadnica treba strogo ograničiti samo na onim terenima gdje su uvjeti za preživljavanje lošiji. |
| Abstract (english) | The paper presents the results of a three-year research into reforestation with one-year-old non-transplanted (1+0) and transplanted (1+1) seedlings of wild pear. The experiments were set on a clear field of section 5b G.J. Dubrava Mokrice managed by the Faculty of Forestry, the University of Zagreb. The soil is pseudogleic and the altitude ranges from 125 to 130 m above sea level. The research focused on field survival, height growth, increment, numbers of primary branches and seedling viability. The transplanted seedlings showed a much better survival rate compared to the non-transplanted ones. Better survival of transplanted seedlings increases with the number of growing seasons on the field, i.e. with the age of seedlings (9.9 % 10.9 %, 12.3 %). The rate of terminal shoot dying was by 1.57% higher with non-transplanted seedlings. After three seasons the non-transplanted seedlings had an average height of 762 mm (360–1640 mm) whereas for the transplanted ones it was 1142 mm (520–2050 mm). The average root collar diameter of non-transplanted seedlings was 12.15 mm (5.71–22.80) and of the transplanted ones 15.36 mm (6.49–26.29). Statistically significant differences in seedling heights were established with respect to treatment, measurement dates and dates of treatment, and in root collar diameter with respect to treatment and measurement dates. The transplanted seedlings were on average by 392 mm higher and had a 3.28 mm larger root collar diameter compared to the non-transplanted ones, which are statistically significant differences. A statistically significant difference in heights and root collar diameter between non-transplanted and transplanted seedlings was established for all measurement dates. At the end of the fourth field season the transplanted seedlings had a larger number of primary branches compared to the non-transplanted ones while the average viability remained similar. Both non-transplanted and transplanted seedlings can be used for reforestation. However, for economical purposes of nursery production and reforestation, the use of higher and older seedlings should be limited only to the areas with poor field survival. |
