SUMMARY
Cabbage is an important vegetable crop species. To obtain high yield of cabbage, good weed management practice must be implemented. A field experiment was conducted to determine the effects of plant density and row arrangement on weed flora and yield of a cabbage crop under Mediterranean climatic conditions. A randomized complete block design was employed with 4 replicates per treatment (single rows 60 cm x 40 cm, single rows 70 cm x 30 cm, single rows 50 cm x 34 cm and paired-rows: the distances between two rows in a pair and between two consecutive paired-rows were 25 cm and 85 cm, respectively, and plant-to-plant spacing was 40 cm; 58,800 plants ha-1). The intercepted PAR by the cabbage canopy increased with increases in plant density to about 59,000 plants ha-1 and this increased interception of PAR resulted in a decrease in weed biomass. Weed density and weed biomass decreased with increasing plant populations. There were also no significant differences between paired-rows and single row pattern at high density. Moreover, plant density affected cabbage yield. The highest yield (10.54 t·ha-1) was observed in the paired-rows planting pattern and the next highest in the single-rows 50 x 34 cm. Our results indicate that paired-rows cabbage production is feasible and the control of various weeds was better in paired-rows than single-rows pattern at lower cabbage density.