Production Potencial of Black Poplar (Section Aigeiros Duby) on Eugley

Abstract

Rad prikazuje mogućnost proizvodnje sadnog materijala pet različitih klonova crne topole na euglejnom tlu. Ovo zemljište je u zoni korije­novog sustava težeg mehaničkog sastava, sa sadržajem ukupnog praha i gline od 65,16–75,72 %, a teksturna klasa je praškasta ilovača do ilovača. Izrazito je povećan sadržaj kapilarnih pora u odnosu na nekapilarne pore, te je vlaga u površinskom horizontu bila teže pristupačna biljkama. Kemijske osobine ukazuju da je ovo zemljište slabo humusno, slabo opskrbljeno hranjivima i ima lošije vodno-zračne osobine u odnosu na zemljišta koja se koriste za ra­sadničku proizvodnju crnih topola. Visinski i debljinski prirast ožiljenica raz­likovao se kod ispitivanih klonova. Prema visinskoj strukturi, klonovi ´S1-3´i ´B-17´, postigl sui veće učešće ožiljenica II klase (2,0–2,5 m) koje se kretalo od 46,2–53,9 % i neznatan udio I klase (›2,5 m) od oko 1 %, kao i veću srednju visinu na kraju razdoblja, dok su klonovi´S6-7´, 260/81 i 155/81 imali manje učešće sadnica II klase (7,4–13,4 %), te nisu imali ožiljenica u I klasi, dok je III klasa zastupljena sa 52,7–82,41 % ožiljenica.The paper presents the results of poplar plants´ growing on the soil that is not typical for poplar nursery production - on eugley soil. The dia­meter and height increments were examined for five clones of black poplar: ´S1-3´ (P. deltoides Bartr ex Marsh), ´B-17´ (P. deltoides Bartr ex Marsh), ´S6-7 ´(P. deltoides Bartr ex Marsh), ´260/81´(P. deltoides Bartr ex Marsh) and ´155/81´(P. × euramericana (Dode) Guinier). This soil type is characterized by the fact that the layer from the surface down to 60 cm depth, where the lar­gest mass of roots of seedlings is formed, contains the highest percentage of the total content of clay and silt, and the worst water-air conditions. The texture classes by the soil profile downwards were: silty loam, clay loam and loamy sand. In this type of soil, we observed low survival of cuttings of the examined black poplar clones that, at the end of the growing season, ranged from 63.7–69.4%. There was no significant difference in cutting survival among them. The least significant differences test at the level of risk of 5% divided examined clones in two groups by shoot height: clones ´S1-3´and´B-17´with a 194–197 cm and the clones´S6-7´,´260/81´and ´155/81´with a 157–168 cm shoot height. The mean diameters were uniform and varied in the range from 12.1 to 13.5 mm. Diameter and height growth of clones varied depending on clones, and the most of seedlings at the end of the growing season were classi­fied in 2nd(2,01 to 2,50 m) and 3rd(1,51 to 2,00 m) height class. Unsatisfactory cutting survival, height and diameter plants increments and lower dimensions of rooted cuttings at the end of the growing season could be primarily attribu­ted to the relatively bad water and air conditions of eugley soil