The effects of inter and intra - row spacings on growth and dry weight of cotton were studied during 1993 at the Agricultural Research Station, Isfahan University of Technology. A randomized complete block design with a split - plot layout was used with four replications. Main plots consisted of four row spacings (50, 60, 80 and 100 cm) and sub - plot were four intra - row spacings (10, 15, 20 and 25 cm). Leaf area index, plant height, lowest auxiliary branch, dry weight of plant parts and mean plant weight were evaluated at 50, 80, 110, 140 and 170 days after planting. Leaf area index and dry weight of leaves, shoots and plant per m2 were significantly affected by row spacing at all samplings, and increased as row spacing decreased. Plant height and weight were significantly reduced and dry weight of boils increased as the row distance decreased. Leaf area index and dry weight of leaves, shoots, boils and plants per unit area were increased at all samplings as distances between plants in a row was reduced. But plant height and weight were increased as distances between plants in a row was increased. Decrease in plants distances increased height of the lowest auxiliary branches from the soil surface. Leaf area index at 110 days after planting and dry weight of boils at 140 days after planting were significantly influenced by row spacing - planting distances interactions. Leaf area index and dry weight of boils increased along with the plant population. From these results, it might be concluded that density of 20 plants per m2 (average row distance of 50 cm with planting on both sides of a wide bed and 10 cm between plants) might be suitable for cotton, CV Vermin, production under conditions similar to this experiment.
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