Effect of Nitrogen Rates on Canola (Brassica napus L.) and Wild mustard (Sinapis arvensis L.) Competition
Author(s):
Abstract:
In order to study the effects of wild mustard density on grain yield and yield components of canola cv. Hyola 401 under different rates of nitrogen fertilizer، a field experiment was conducted in 2011-2012. The layout was split-plot in a completely randomized block design and three replications. Main-plots included four levels of nitrogen (0، 70، 140 and 210 kg ha-1) and sub-plots consisted of different wild mustard densities (0، 6، 12، 18 and 24 plants m-2). Results showed at densities of 6، 12، 18 and 24 wild mustard. m-2، grain yield losses were 15. 5%، 36. 7%، 47. 4% and 58. 6%، respectively. Grain yield loss was due to reduction in number of grains per plant and 1000-grain weight. Agronomic N use efficiency (ANUE) of canola decreased as the weed density increased. The highest ANUE was obtained in 70 kgNha-1، without weed interference. The lowest ANUE was in 210 kgNha-1 and 24 wild mustard plant. m-2 treatment. Generally، application of 140 kgNha-1 lead to higher competitiveness and lower grain yield loss in canola compared with 0 kgNha-1، whereas، in 210 kgNha-1، the negative impact of 12 wild mustard. m-2 and above on canola grain yield، was higher than other N treatments.
Language:
Persian
Published:
Iranian Journal of Field Crops Research, Volume:11 Issue:2, 2013
Pages:
357 - 364
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