Ali Jahani; Vahid Etemad; Mohammad Doolati; Nazi Avani
Volume 18, Issue 3 , September 2011, , Pages 463-473
Abstract
Production of native and non native species in the nursurey is considered as one of the raw materials for reforestation in arid regions. Two important factors affecting the seedling production in the nursery are seed density and seed planting depth which extensive studies have been done in this area. ...
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Production of native and non native species in the nursurey is considered as one of the raw materials for reforestation in arid regions. Two important factors affecting the seedling production in the nursery are seed density and seed planting depth which extensive studies have been done in this area. Therefore in this research the effect of seed density and planting depth on height, diameter growth and viability of H. persicum have been investigated. Haloxylon plantations of Hossein Abad in Qom province with an area of 3180 hectares, is located 30 km south-east of Qom city. Planting depth in four levels of 1, 2, 3 and 4 cm and seed density in five levels of 100, 200, 300, 400 and 500 seeds per 1000 m2were measured. All data were analyzed and the results showed that planting depth of 1 cm had the best results with regard to the basal diameter, height growth and viability percentage so is recommended for reforestration. Planting density of 200 seeds per 1000 m2was also identified suitable for afforestation.
Mahmood khosravi fard; Abbas ali sandgol; Ahmad Akbarinia
Volume 13, Issue 2 , February 2006, , Pages 94-101
Abstract
About 15% of Iranian lands are affected by salinity. Species of chenopodiacea family, such as Atriplex canescens is special for planting in these area. This study was conducted from 1993 to 2003 in Nowdehak rangeland station of Qazvin province. objectives of this research were planting density of Atriplex ...
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About 15% of Iranian lands are affected by salinity. Species of chenopodiacea family, such as Atriplex canescens is special for planting in these area. This study was conducted from 1993 to 2003 in Nowdehak rangeland station of Qazvin province. objectives of this research were planting density of Atriplex canescens. The statistic design was split split plot (using on CRBC) with three replication. Main plot were density (2´2, 4´4, 6´6 meter), sub plots were pruning period (annual, binnial, triennial) and sub sub-plot were hight pruning (control, complete pruning, 20, 40, 60 heights). Result showed that planting density and pruning had significant effect on forage yield (P<0.01). Planting density 2´2 m had higher yield than others treatments. Complete pruning and pruning 20 cm height had no differet yield but produced forage were higher than other treatments. Triennial pruning preiod was better than anuual and binnial praning priod in respect of forage yield. Generally result showed that in this area and similar zone planting, distance (2´2m) with triennial pruning and complete pruning had maximum forage yield.