A research on determination of effects of different lateral spacing and irrigation programme for drip irrigated cotton in Aydin province

This research was conducted to determine the effect of different lateral spacing and irrigation levels on seed cotton yield and some quality and agronomic paremeters of cotton in the Research and Application Farm of Faculty of Agriculture at Adnan Menderes University during the year of 2009. Experiment was set up out in randomized plot design with two factors and three replications. Trials comprised two lateral spacing (0.70 m ? 1.40 m) within each of which three different watering regimes (100, 75 and 50 % of 8 ? day cumulative Class-A pan evaporation) were applied. The results revealed that lateral spacings and irrigation levels affected the seed cotton yield and the highest yield was observed as 648,6 kg/da at full irrigation level of 100 % (T4) of control plot and in 1.40 m of lateral spacings. The lowest yield was observed as 537.2 kg/da from 50 % (T3) treatment . Maximum water use was determined in the T1 treatment as 723.4 mm; and the lowest water use was in the T6 treatment with 495.6 mm. Lateral spacings and the amount of irrigation water applied were both affected the fiber thickness, fiber length, fiber strength, number of bolls per plant, boll weight, 100 seed weight, lint percentage, number of generative branches. L2 lateral irrigation water applied in the range of 100% of subjects were found to be more appropriate in the economic sense.Key words: cottonn, lateral spacings, irrigation level, drip irrigation, yield response factor.