استفاده از مالچ در موفقيت جنگل كاري با ژنوتيپهاي برتر گردو JUGLANS REGIA L در اراضي جنگلي استان كردستان

Walnut plantation trial in Kurdistan province ofIran

This experiment was conducted in Rikhalan Experimental Station in Marivan city of Kurdistan province of Iran in 1999 and ended in 2006. In first phase, (nursery seleetion) 29 genotypes of walnut (Juglans regia L.) were studied, under Randomized Complete Blocks Design (RCBD) with four replieations in three years, The measured tree characteristics were: height, col1ar diameter and survival. Based on the results of first phase, for the seeond phase, five genotypes of walnut (J-2, J-IO, J-17, J-18 and J-19) were selected and planted under Split Plots Design with three replieations during seven years (1998-2006). The main plots were: Control and soil surface with mulch cover and the secondary plots contained five walnut genotypes. Results showedthat there were only significant differenees between the main treatments in respect to the growth characteristics (p < 0.01). Survival, erown diameter, height and collar diameter of the walnuts at plots applied with plant material muleh (oak chipped branches) were significantly greater (96.7 %,72.6 cm, 135.9 cm and 37.4 mm, respectively) than the walnuts at control plots (77.9 %, 50.1 em, 95.6 and 28.4 rnrn, respectively).