College of Dryland Agriculture and Natural Resources Management
Permanent URI for this communityhttps://repository.mu.edu.et/handle/123456789/13
Browse
1 results
Search Results
Item Nitrogen rate, Plant Density and Weeding effect on Weed Dynamics and Yield of Onion (Allium cepa L) under Irrigated Condition in Enderta District, Tigray, Northern Ethiopia(Mekelle University, 2025-02-01) Birtukan Gebrekirosplots. In addition, maximum marketable yield (9965 kg/ha), total bulb yield (9992 kg/ha) were recorded from weeded plots. Higher bulb shape index (1.3) which is considered as non-desirable was found on weedy plots. Plant density had significant effect on leaf length, bulb weight, bulb diameter as well as bulb shape index. The highest leaf length (33.7cm), bulb weight (53.6g), and bulb diameter(4.4cm) was obtained at high plant density from hand weeded plots. Onion bulbs had highest shape index (1.2) at plant density of 333,333 plants/ha on hand weeded plots. Likewise, N rate had significant effect on days to 90% maturity and bulb length. The highest bulb length (5cm) was recorded from hand weeded plots received 46kg N ha-1. Onion maturity was delayed when N was applied at a rate of 69 kg N ha-1 on hand weeded plots. Except hand weeding, all other factors did not have significant effect on onion marketable yield, unmarketable yield and total bulb yield. Maximum marketable yield (9,965 kg/ha) was obtained from hand weeded plots and the lowest marketable yield (4758) was recorded from un weeded plots. Generally, weeds cause a yield loss of (52.2) %. In conclusion, weed species found in onion field were comprised of a wide range of annual species in life cycle and broad leaf in nature of growth habit. Hand weeding resulted in weed dynamics and shifted weed-crop competition advantage in favor of the crop. It influenced the crop throughout its growth and development. Variation in amount of N rate fertilizer resulted in weed dynamic and influenced only bulb length. However, plant density did not have visible effect on weed and the crop’s growth, development and productivity. In recommendation. The experiment has to be repeated in more location and season to make a conclusive recommendation