Height growth behavior of Poplar clones in Kurdistan
2004
Bayazid Yosofi | Ali Reza Modir-Rahmati
In this study, saplings of eight poplar clones from six species including (Populustrichocarpa, P. nigra cv. Kamyaran, P.n.56.72, P.deltoides 63.3, P.euramericana 488, P. alba cv. Kabudeh Bumi, P. a cv. Kabudeh Shirazi and P. euphratica)have been evaluated for height growth in Zalleh station of Sanandaj in Kurdistan province. Based on nested design with eight treatments and 10 replicates, the study was carried out in 2001. The results showed that there was significant difference between the species height performance P.d.63.3 (234.4 cm) and P.euphratica (78.8 cm) greatest had the and the lowest height growth, respectively. Based on the results, there were three different growing season stages for height growths in poplars, including: 1-primary slow growth stage prior June, 2-fast growth stage during June - September and 3-secondry slow growth stage after September. The daily height growth rate of the poplar clones in mentioned stages were 25.77, 101.57 and 14.52 cm, respectively. P.d.63.3 as a superior clone among the other clones, had low growth at the first and the third stages but very high growth at the second stage. P. Trichocarpa finished the third second stage earlier than the others at July and P.e.488 showed high growth at the first and stages, but low growth at the second stage. Considering climate condition of Sanandaj in 2001, the studied Poplar clones began the first stage at average daily temperature of 13ºC and average photo radiation period of hour per month (h/m), as well as the second stage at 25 ºC and 370 h/m and the third stage at 10 ºC and 220 h/m.
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