RESPONSE OF SOME VARIETIES OF SUNFLOWER CROP ( Helianthus annuus L.) TO NITROGEN FERTILIZER UNDER TWO MATURITY DATES
Mesopotamia Journal of Agriculture,
2012, Volume 40, Issue 0, Pages 1-14
AbstractThe experiment was conducted out at Al-AShalalat region (15 km ) north of Mosul during spring and summer seasons in 2010, in clay soil . Planting dates were the on 1April and 6Jully for both spring and summer seasons respectively. The experiment was carried out using RCBD within split plot with three replications. The aim of this study was to study the effect of three levels of nitrogen fertilizer (60, 80 and 100kg N/ha) and two maturity dates of head (Physiological and complete maturity) on the growth and yield of three sunflower varieties (Mangarin , Azur and Louse).The results showed that Mangarin variety was superior in 1000 seed wt and specific wt. of seeds in spring season, whereas no. of seeds/head and seed moisture percentage significantly increased in summer season. Azur variety had a high value in seed yield and oil percentage in summer season. Sunflower seeds reached physiological maturity with 80 kg N/ha and complete maturity with 100 kg N/ha. The highest seed yield and oil percentage were obtained by complete maturity treatment when sunflower was sown in spring season. The interaction between : Azur variety 100 Kg N/ha complete maturity gave the highest rate in seed yield for both seasons.
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