نوع مقاله : نامه‌های علمی
نویسندگان
1 استادیار پژوهش، بخش تحقیقات منابع طبیعی، مرکز تحقیقات و آموزش کشاورزی و منابع طبیعی استان مرکزی، سازمان تحقیقات، آموزش و ترویج کشاورزی، اراک، ایران.
2 استادیار پژوهش، مؤسسه تحقیقات جنگلها و مراتع کشور، سازمان تحقیقات، آموزش و ترویج کشاورزی، تهران، ایران
چکیده
کلیدواژه‌ها
عنوان مقاله [English]
نویسندگان [English]
In this research, 21 clones of closed-crown superior poplar were selected from among the clones studied in the first stage of the experiment (selection nursery) under the randomized complete blocks statistical design with three replications at 3 x 3 m—spacing for ten years. Clone No. 72 was collected from the Markazi province in 1993. Other clones were tested and planted in other regions of the country or abroad in 1997. During the growing seasons in different years, in addition to post-planting operations (irrigation, weeding, pruning), the percentage of resistance and sensitivity of different clones in five qualitative grades, including grade 5 (76-100% resistant), grade 4 (51-75% resistant), grade 3 (26-50% resistant), grade 2 (1-25% resistant) and grade 1 (Zero, fully sensitive) were recorded. Clones were graded in terms of trunk quality and branch density. The results of the 10-year performance evaluation indicated that clones of P.a.72.7 and P.a.49/39 than to Melanophyla picta Pall., clones of P.n.56.72, P.a.72.7, P.a.44.9, P.a.49.39 and P.a.17.60 than to Paranthrene tabaniformis, and clones of P.n.betulifolia, P.a.72.7, P.a.44.9, P.a.49.39, P.n.63.135, and P.a.17.60 than to Phloeomyzus passerinii Sign. were completely resistant. Clones of P.n.betulifolia, P.n.56.72, P.a.72.7, P.a.44.9, P.a.49.39 and P.a.17.60 were more resistant to all pests and clones of P.n.72.13, P.n.72.11, P.n.47.40 and P.n.72.18 were in the most contaminated condition. P.n.72.11, P.n.72.19, and P.n.72.5 clones had smooth and straight trunks and low branch density. The suitable clones of P.n.56.72, P.n.72.19, P.a.72.7, and P.a.44.9 are selected and introduced for cultivation in Populus plantations in Markazi province. These clones are selected based on resistance to pests and trunk quality.
کلیدواژه‌ها [English]
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