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Vahidpour, H., Zaefarian, F., Nazari, S., Mansoori, I. (2020). Effect of different levels of nitrogen and planting density on rapeseed (Brassica napus L.) and lepyrodiclis (Lepyrodiclis holosteoides Fenzl.) competition. , 50(4), 63-74. doi: 10.22059/ijfcs.2019.260960.654493
Hossein Vahidpour; Faezeh Zaefarian; Shahram Nazari; Irandokht Mansoori. "Effect of different levels of nitrogen and planting density on rapeseed (Brassica napus L.) and lepyrodiclis (Lepyrodiclis holosteoides Fenzl.) competition". , 50, 4, 2020, 63-74. doi: 10.22059/ijfcs.2019.260960.654493
Vahidpour, H., Zaefarian, F., Nazari, S., Mansoori, I. (2020). 'Effect of different levels of nitrogen and planting density on rapeseed (Brassica napus L.) and lepyrodiclis (Lepyrodiclis holosteoides Fenzl.) competition', , 50(4), pp. 63-74. doi: 10.22059/ijfcs.2019.260960.654493
Vahidpour, H., Zaefarian, F., Nazari, S., Mansoori, I. Effect of different levels of nitrogen and planting density on rapeseed (Brassica napus L.) and lepyrodiclis (Lepyrodiclis holosteoides Fenzl.) competition. , 2020; 50(4): 63-74. doi: 10.22059/ijfcs.2019.260960.654493

Effect of different levels of nitrogen and planting density on rapeseed (Brassica napus L.) and lepyrodiclis (Lepyrodiclis holosteoides Fenzl.) competition

علوم گیاهان زراعی ایران
Article 6, Volume 50, Issue 4, January 2020, Pages 63-74    PDF (654.95 K)
Document Type: Research Paper
DOI: 10.22059/ijfcs.2019.260960.654493
Authors
Hossein Vahidpour1; Faezeh Zaefarian* 2; Shahram Nazari3; Irandokht Mansoori4
11M.Sc student of Weed Science, Faculty of Crop Sciences, Sari Agricultural Sciences and Natural Resources University, Sari, Iran
2Department of Agronomy, Sari Agricultural sciences and Natural Resourses
3Department of Agronomy and Plant Breeding, Faculty of Agriculture, Bu Ali Sina University, Hamedan, Iran
4Instructor of Agronomy, Faculty of Crop Sciences, Sari Agricultural Sciences and Natural Resources University, Sari, Iran
Abstract
To investigate the effect of different lepyrodiclis (Lepyrodiclis holosteoides Fenzl.) densities on grain yield reduction, as well as qualitative and nitrogen agronomic efficiency of rapeseed (Brassica napus L.), a factorial experiment was conducted in a randomized complete block design with three replications in Karaj, 2016-2017. Factors included nitrogen content from urea fertilizer source at four levels (0, 50, 100 and 150 kg N/h, rapeseed densities (70 and 90 plants/m2) and weed density at four levels (0, 5, 10 and 15 plants/m2). The results showed that maximum yield loss at 70 and 90 plant densities of rapeseed/m2 was 26.54 and 78.45%, respectively, with 150 and 100 kg nitrogen. The highest percentage of oil and oil yield were 77.40% and 1504 kg/ha, respectively that were obtained by 90 plants/m2of rapeseed and 150 kgN/ha and no weed. The highest N-agronomic efficiency (89.19 kg/kg) was obtained by 90 rapeseed plants/m2 and without weed presence. The highest N-partial factor productivity was 36.24 kg/kg that was observed in 90 plants/m2 rapeseed and 50 kgN/ha. The results of nitrogen interaction and lepyrodiclis density indicated that the highest N-partial factor productivity (87.23 kg/kg) was observed in the treatment of 50 kg N/ha and absence of weed.
Keywords
Grain yield; nitrogen agronomic efficiency; oil percentage; rapeseed
References

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