Document Details
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Document Type |
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Thesis |
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Document Title |
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Effect of Nitrogen Fertilizer Rates, Defoliation, and Cultivars on Yield, Yield Components, Seed Oil and Protein Contents of Sunflower (Helianthus annuus L.) تأثير معدلات السماد النيتروجيني والتوريق والصنف على المحصول ومكوناته ومحتوي البذور من الزيت والبروتين في دوار الشمس (Helianthus annuus L.) |
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Subject |
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Faculty of Meteorology, Environment and Arid Land Agriculture |
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Document Language |
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Arabic |
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Abstract |
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This study was conducted during 2017 and 2018 seasons at the Agricultural Research Station, King Abdulaziz University, at Hada Al-Sham to investigate the effects of 3 nitrogen fertilizer rates (100, 200 and 300 kgN/ha), 3 defoliation levels (0.0, 2 and 4 leaves/plant) starting from the 3rd node at the full flowering of plants on 3 different sunflower cultivars (Egyptian cv. Sakha -53, Argentina cv. Argentins -11 and Turkish cv. May Hybrid). The experiment was conducted in a split- split plot design with 4 replicates. The main plot treatments were the nitrogen rates, the sub-plot treatments were defoliation levels and the sub sub-plot treatments were the cultivars. The recorded data included growth and growth components, yield and yield components, seed oil and protein contents besides soil organic matter, nitrogen, pH and salinity. The results showed significant effects of N, defoliation and cultivars and their interactions on all studied parameters. Application of nitrogen fertilizer up to 300 kgN/ha increased sunflower flowering date, head diameter, seed weight per plant, seed yield per hectare, seed protein content, leaf chlorophyll, and increased soil nitrogen percentage and soil organic matter (O.M.%). But seed oil content and soil pH value were reduced by increase in N rates up to 300 kgN/ha. Defoliation significantly affected growth of Sunflower cultivars, and the highest plant, the highest head diameter, seed weight per plant, weight of 100 seeds and total seed yield per hectare, the highest values of the percentages of seed oil, seed protein, and leaf chlorophyll content were attained under the defoliation treatment of 4 leaves removal. The two varieties Argentina 11 and Sakha 53 cultivars were the highest in seed yield /ha and were not significantly different from each other. The Egyptian cultivar was the highest in oil content followed by the Turkish and then the Argentina cultivar. The Turkish cultivar was the highest in protein content followed by Egyptian and Argentina. The Egyptian cultivar Sakha 53 and Argentina cultivars under 300 mg N / ha gave the highest seed yield / ha compared with the other two interactions between the nitrogen and the cultivars. Sakha 53 cultivar under 4 leaves removal gave the higher oil content, while the Turkish cultivar Hybrid May under 2 leaves removal gave the highest protein content.
For soil nitrogen percentage (N%) the best treatment combination was 300 kgN/ha x 4 leaves removal for Sakha 53 cultivar, and 300 kgN/ha x 2 leaves removal for Hybrid May, and for the highest soil organic matter (O.M.%) the best combined treatments was 300 kgN/ha x 2 and 4 leaves removal for the three cultivars. The obtained results will be important for the agricultural sector, farmers, animal producers and health sector. |
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Supervisor |
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Prof. Samir Gamil Al-Solaimani |
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Thesis Type |
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Doctorate Thesis |
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Publishing Year |
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1440 AH
2019 AD |
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Co-Supervisor |
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Prof. Fathy Saad El-Nakhlawy |
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Added Date |
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Wednesday, August 21, 2019 |
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Researchers
| عبدالله أحمد بجيلي | Bjaili, Abdullah Ahmed | Researcher | Doctorate | |
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