تأثیر خاکپوشهای آلی و پلاستیکی بر زیست توده علفهای هرز شاخص های کیفی و عملکرد پیاز خوراکی (.Allium cepa L).

Background & Objectives: This research was conducted in order to investigate the effect of different mulches on weed biomass weight, yield and some physiological characteristics of onion. Materials & Methods: In order to investigate the effect of different mulches on weed biomass weight, yield and some physiological characteristics of onions, an experiment was conducted in a randomized complete block design with three replications at sample field in Jiroft area at 2019-2020 growing season. Experimental treatments included levels five inorganic mulch of black plastic, white plastic, organic mulch of wheat straw, weeding and control treatment. Traits such as plant height, bulb height, bulb diameter, neck diameter, bulb yield, TSS, bulb sulfur content, percentage of acid, soil temperature, soil moisture content and weed biomass weight were evaluated in three stages. Results:The results showed that all the studied traits except TSS were significantly affected by different mulches. The highest bulb height (73.1 mm), bulb diameter (69 mm), neck diameter (13.3 mm), bulb yield (55707 kg/ha), maximum temperature and soil moisture percentage were obtained in black mulch treatment. Thus, the bulb yield, bulb diameter and organic acids increased by 48.8%, 46.6% and 31.3% in the black mulch treatment, respectively. The highest amount of sulfur was observed in the straw and stubble treatment, There was no significant difference with black mulch treatment. Three types of dominant weeds such as wild mustard (Sinapis arvensis L.), malva (Malva neglecta L.) and leek (Chenopodium album L.) were observed in the studied onion field. The highest and lowest weed biomass of weeds were obtained in the first and third stages of sampling in control and black mulch. Conclusion:The results of this research showed that the improvement of quantitative and qualitative characteristics of onion was influenced by the type of mulch used. The use of appropriate mulch was effective in reducing the number and biomass of weeds and producing optimal yield of onion. According to the research results, black mulch treatment is the best treatment to control weeds and produce optimal yield. [ABSTRACT FROM AUTHOR]