The effect of organic and chemical fertilizers on oilseed rape productivity and weed competition in short rotation |
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| Authors: | Ruhollah Naderi Ehsan Bijanzadeh Todd P Egan |
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| Institution: | 1. Department of Crop Production and Plant Breeding, Faculty of Agriculture, Shiraz University, Shiraz, Iran;2. rnaderi@shirazu.ac.ir;4. Agroecology Department, College of Agriculture and Natural Resources of Darab, Shiraz University, Iran;5. Division of Mathematics and Natural Sciences, Elmira College, Elmira, NY, USA |
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| Abstract: | AbstractA two-year field experiment was conducted to investigate the impact of short crop rotation and organic amendments on rapeseed yield under weed competition conditions. The primary experimental plots consisted of either triticale or pea as a prior crop, consisting of four subplots with either 25 tons of composted cattle manure (CCM), 150?kg urea N ha?1 (N), 25 tons composted cattle manure + 75?kg urea N ha?1 (CCM?+?N), or no urea N or manure added as the control (C0). Rapeseed seed yield was not significantly affected by previous crops, except for rapeseed grown after pea which had slightly higher seed yield (2058?kg ha?1) than those grown after triticale (1942?kg ha?1). Plants that received CCM?+?N produced the highest amount of seed yield (2447?kg ha?1), but were not significantly different from plants that received just urea N (2218?kg ha?1). Weeds gained more biomass when the previous crop was pea compared to those whose previous crop was triticale. Weeds in plots that received CCM?+?N produced the greatest biomass, followed by N, and CCM plots, respectively. |
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| Keywords: | Short term rotation sustainable agriculture weed competitive ability |
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