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ABSTRACT
The influence of nitrogen fertilization on the relative competitiveness of cilantro and purple nutsedge was determined using a single-density replacement series at 116 plants/m2. At the tested substitutive cilantro:purple nutsedge population proportions (100:0, 75:25, 50:50, 25:75 and 0:100) and four nitrogen application rates (0, 36, 72 and 108 kg/ha), the relative crowding coefficient indicated both species were equally aggressive at the 50:50 proportion after 40 days with 0 or 36 kg N/ha. As nitrogen was increased to 72 and 108 kg/ha, however, the competitiveness of purple nutsedge was enhanced (about 15 times more competitive than cilantro).