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Journal: AGRICULTURAL RESEARCH | Year:1386 | Volume:7 | Issue:3 | Start Page:129 | End Page:140

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Title

SUNFLOWER YIELD AND YIELD COMPONENTS RESPONSES TO WATER STRESS UNDER DIFFERENT PLANT DENSITIES

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 Start Page 129 | End Page 140

Abstract

 In order to study the effects of WATER STRESS on YIELD and YIELD components of SUNFLOWER under different plant densities spilt plot experiment was carried out based on RCBD with four replications in Karaj. WATER STRESS levels were irrigation after 50, 100, 150 and 200 mm evaporation from class A evaporation pan, and PLANT DENSITY levels were 6, 8, 10 and 12 plant m-2 that were set as main and sub plot, respectively. Dry weight per plant, dry weight per m, seed number per plant, seed number per m2, 1000 seed weight, seed YIELD, harvest index and oil seed content reduced under WATER STRESS.Plant density had effect on all characteristics, except 1000 seed weight and oil seed content. WATER STRESS caused high decrease in seed YIELD, that was due to decreasing seed number per plant (%60) and 1000 seed weight (%39).Comparison of PLANT DENSITY levels showed that the highest seed YIELD obtained from 12 plant m-2 (1934 kg.ha-1). Decreasing PLANT DENSITY reduced the seed YIELD, and the lowest seed YIELD was obtained from 6 plant m-2 (l235 kg.ha-1). Although seed number per plant reduced under the density of 12 plant m-2, but its high seed YIELD was due to increase in seed number per m2 despite of decreasing of 1000 seed weight. The highest seed YIELD obtained from irrigation after 50 mm evaporation, and PLANT DENSITY of 12 plant m-2 (3192 kg.ha-1).

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