Abstract— A field experiment was carried out in the demonstration farm of Sudan University of Science and Technology, College of Agricultural Studies, Shambat, for two consecutive seasons 2014/15 and 2015/16 to determine the effects of synthetic N (urea) and P (superphosphate) fertilizers and/or microbial biofertilizers on plant height (cm), number of leaves per plant, shoot and root dry weights, head diameter and 1000 seed weight of the sunflower hybrid Shambat. Nitrogen and phosphorus were applied at 100 and 50 kg/feddan, respectively. Biofertilizers were applied as a mixture of Azospirillum Brasilense (a nitrogen fixer) and Bacillus megaterium var. phosphaticum (a phosphate solubilizer). A combination of synthetic and biofertilizers was applied in addition to the control. NP treatment gave the highest values of growth parameters in the first season followed by biofertilizers. In the second season biofertilzers then their combination produced the highest values. Head diameter and 1000 seed weight were enhanced by NP fertilizers. Significant differences in the first season were found only between NP and the combination of NP + AB in the number of leaves per plant and root dry weight, and in the second season the same treatments were significantly different only in shoot dry weight.
Keywords— Sunflower, biofertilizer, nitrogen, phosphorus, growth.
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