The effect of organic and chemical fertilizers on oilseed rape productivity and weed competition in short rotation

摘要

A 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.