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Wide adaptability of sunflower and wide range of climatic conditions existing in Pakistan make it possible to have two crops of sunflower in a year,  i.e. , in spring and fall. Field experiments, one in spring and another in fall were conducted at the University of Arid Agriculture, Rawalpindi, Pakistan, to evaluate the influence of seasonal variations on yield and yield components of sunflower. Five sunflower hybrids were planted in a randomized complete block design in three replications. Two inner rows were harvested for measurements of yield and yield components. It was observed that head size of spring crop was larger than fall crop. Contrary to head size, 1000-seed weight of the fall crop was larger than that of the spring crop. However, final yield of the spring crop was greater than that of the fall crop. It led to the conclusion that having spring crop is the best option, while fall crop could be supplementary one, to increase the production of oilseeds.

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INFLUENCE OF SEASONAL VARIATIONS ON YIELD AND YIELD COMPONENTS OF SUNFLOWER / INFLUENCIA DE LAS VARIACIONES ESTACIONALES EN EL RENDIMIENTO Y COMPONENTES DE RENDIMIENTO EN GIRASOL / EFFET DES VARIATIONS SAISONNIÈRES SUR LE RENDEMENT ET SUR LES COMPOSANTS DU RENDEMENT DU TOURNESOL