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Effect of Times and Levels of Nitrogen Fertilization on the Characters of Vegetative Growth, Flowering and the Yield of Summer Squash (Cucurbita pepo L.) c.v. Mullah ahmad

تأثير معدلات التسميد الآزوتي و مواعيد إضافته في نمو نبات الكوسا و إزهاره و إنتاجيته (.L pepo Cucurbita) في محافظة نينوى

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 Publication date 2010
and research's language is العربية
 Created by Shamra Editor




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This study was conducted at the vegetable field of department of horticulture and landscape design, college of agriculture and forestry ,Mosul university, during spring of 2007 and 2008, to study the effect of times and levels of nitrogen fertilization on some characters vegetative growth, flowering ,and yield of summer squash .Result indicated that, the time of nitrogen fertilization at the stage of fruit-set caused a significant increased in the leaf number /plant ,length of the plant and the fresh weight/plant. While the time of nitrogen fertilization wasn't affected significantly the total yield. The level at 320 kg.N/ha caused a significant increase of the characters vegetative growth and total yield. Also result revealed that, the interaction between the stage at fruit set and nitrogen fertilization at 320 kg.N/ha led to increase the total yield .The yield was found to positively correlation with the plant length ,fresh and dry weights of plant, leaf area, fruit weight, male and female flowers, and the sex ratio.


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Research summary
تُجرى هذه الدراسة في حقل الخضروات التابع لقسم البستنة وتصميم المناظر الطبيعية، كلية الزراعة والغابات، جامعة الموصل، خلال ربيع 2007 و2008، لدراسة تأثير توقيت ومستويات التسميد بالنيتروجين على بعض خصائص النمو الخضري، الإزهار، وإنتاجية الكوسا الصيفية. أشارت النتائج إلى أن توقيت التسميد بالنيتروجين في مرحلة تكوين الثمار أدى إلى زيادة كبيرة في عدد الأوراق لكل نبات، طول النبات، والوزن الطازج لكل نبات. بينما لم يؤثر توقيت التسميد بالنيتروجين بشكل كبير على الإنتاج الكلي. مستوى التسميد عند 320 كجم نيتروجين/هكتار أدى إلى زيادة كبيرة في خصائص النمو الخضري والإنتاج الكلي. كما كشفت النتائج أن التفاعل بين مرحلة تكوين الثمار والتسميد بالنيتروجين عند 320 كجم نيتروجين/هكتار أدى إلى زيادة الإنتاج الكلي. وُجد أن الإنتاجية ترتبط إيجابياً بطول النبات، الأوزان الطازجة والجافة للنبات، مساحة الأوراق، وزن الثمار، الأزهار الذكرية والأنثوية، ونسبة الجنس.
Critical review
دراسة نقدية: تعتبر هذه الدراسة ذات أهمية كبيرة في مجال الزراعة والبستنة، حيث تقدم معلومات قيمة حول تأثير التسميد بالنيتروجين على نمو وإنتاجية الكوسا الصيفية. ومع ذلك، هناك بعض النقاط التي يمكن تحسينها. على سبيل المثال، كان من الممكن توسيع نطاق الدراسة ليشمل مواسم زراعية مختلفة وظروف بيئية متنوعة للحصول على نتائج أكثر شمولية. كما أن الدراسة لم تتناول تأثير التسميد بالنيتروجين على جودة الثمار، وهو جانب مهم يجب أخذه في الاعتبار. بالإضافة إلى ذلك، كان من الممكن استخدام تقنيات تحليلية أكثر تقدمًا للحصول على فهم أعمق للتفاعلات بين العوامل المختلفة.
Questions related to the research
  1. ما هو تأثير توقيت التسميد بالنيتروجين على عدد الأوراق لكل نبات؟

    توقيت التسميد بالنيتروجين في مرحلة تكوين الثمار أدى إلى زيادة كبيرة في عدد الأوراق لكل نبات.

  2. هل أثر توقيت التسميد بالنيتروجين بشكل كبير على الإنتاج الكلي؟

    لا، توقيت التسميد بالنيتروجين لم يؤثر بشكل كبير على الإنتاج الكلي.

  3. ما هو مستوى التسميد الذي أدى إلى زيادة كبيرة في خصائص النمو الخضري والإنتاج الكلي؟

    مستوى التسميد عند 320 كجم نيتروجين/هكتار.

  4. ما هي العوامل التي وُجد أن الإنتاجية ترتبط بها إيجابياً؟

    الإنتاجية ترتبط إيجابياً بطول النبات، الأوزان الطازجة والجافة للنبات، مساحة الأوراق، وزن الثمار، الأزهار الذكرية والأنثوية، ونسبة الجنس.


References used
Al-Mishaal, A. J.; A. G. Behari and A. A. Gallum. (1984). Effect of nitrogen fertilization and spacing between plants on flowering and yield of squash (Cucurbita pepo L.). JAWRR. 3(2): 23-32
Abou-El-Yazeid A.; H. E. Abou-Aly; M. A. Maoly and S. A. M. Mousa. (2007). Enhancing growth productivity and quality of squash plants using phosphate dissolving micro organisms (Bio-phosphors ®) combined with boron foliar spray. Res. Jour. of Agric. and Bio. Sci. 3(4) :274- 289
Chhonkar, V. S.; D. N. Singh and R. L. Singh (1979). Genetic variability and correlation studies in muskmelon. Indian J. Agric. Sic. 49(5):361-363
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