MARC details
| 000 -LEADER |
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| fixed length control field |
06143namaa22004331i 4500 |
| 003 - CONTROL NUMBER IDENTIFIER |
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| control field |
OSt |
| 005 - أخر تعامل مع التسجيلة |
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| control field |
20250223033419.0 |
| 008 - FIXED-LENGTH DATA ELEMENTS--GENERAL INFORMATION |
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| fixed length control field |
250127s2024 |||a|||f |m|| 000 0 eng d |
| 040 ## - CATALOGING SOURCE |
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| Original cataloguing agency |
EG-GICUC |
| Language of cataloging |
eng |
| Transcribing agency |
EG-GICUC |
| Modifying agency |
EG-GICUC |
| Description conventions |
rda |
| 041 0# - LANGUAGE CODE |
|---|
| Language code of text/sound track or separate title |
eng |
| Language code of summary or abstract |
eng |
| -- |
ara |
| 049 ## - Acquisition Source |
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| Acquisition Source |
Deposit |
| 082 04 - DEWEY DECIMAL CLASSIFICATION NUMBER |
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| Classification number |
635.67 |
| 092 ## - LOCALLY ASSIGNED DEWEY CALL NUMBER (OCLC) |
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| Classification number |
635.67 |
| Edition number |
21 |
| 097 ## - Degree |
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| Degree |
Ph.D |
| 099 ## - LOCAL FREE-TEXT CALL NUMBER (OCLC) |
|---|
| Local Call Number |
Cai01.07.01.Ph.D.2024.Ah.B. |
| 100 0# - MAIN ENTRY--PERSONAL NAME |
|---|
| Authority record control number or standard number |
Ahmed Metwally Ahmed Metwally, |
| Preparation |
preparation. |
| 245 10 - TITLE STATEMENT |
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| Title |
Breeding Maize for Tolerance to High Plant Density and Low-N / |
| Statement of responsibility, etc. |
By Ahmed Metwally Ahmed Metwally; Under Supervision of Dr. Ahmed Medhat Mohamed Al-Naggar, Dr. Mohamed Reda Ali Shabana, Dr. Mosaad Soliman Hassanein. |
| 246 15 - VARYING FORM OF TITLE |
|---|
| Title proper/short title |
تربية الذرة الشامية لتحمل الكثافة النباتية العالية و النيتروجين المنخفض / |
| 264 #0 - PRODUCTION, PUBLICATION, DISTRIBUTION, MANUFACTURE, AND COPYRIGHT NOTICE |
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| Date of production, publication, distribution, manufacture, or copyright notice |
2024. |
| 300 ## - PHYSICAL DESCRIPTION |
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| Extent |
296 pages : |
| Other physical details |
illustrations ; |
| Dimensions |
25 cm. + |
| Accompanying material |
CD. |
| 336 ## - CONTENT TYPE |
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| Content type term |
text |
| Source |
rda content |
| 337 ## - MEDIA TYPE |
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| Media type term |
Unmediated |
| Source |
rdamedia |
| 338 ## - CARRIER TYPE |
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| Carrier type term |
volume |
| Source |
rdacarrier |
| 502 ## - DISSERTATION NOTE |
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| Dissertation note |
Thesis (Ph.D)-Cairo University, 2024. |
| 504 ## - BIBLIOGRAPHY, ETC. NOTE |
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| Bibliography, etc. note |
Bibliography: pages 271-296. |
| 520 ## - SUMMARY, ETC. |
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| Summary, etc. |
Maximizing of maize productivity from land unit area in Egypt could be achieved via growing <br/>tolerant hybrids to high plant density (HD) and low-N in combination with using the optimum <br/>plant density and appropriate nitrogen fertilization rate. A set of inbred lines with obvious <br/>diversity in their adaptive traits to HD and low-nitrogen (LN) were used in the present study as <br/>parents of diallel crosses (without reciprocals) to study the inheritance of these traits, identify <br/>tolerant genotypes to HD and LN stresses and determine adequate N-fertilization for <br/>maximizing grain yield/fed (GYPF). The F crosses were made in 2019 and evaluation of <br/>inbreds and hybrids was carried out in 2020 and 2021 seasons, at the Agricultural Experiment <br/>and Research Station of the Faculty of Agriculture, Cairo University, Giza, Egypt. A split-split <br/>plot design in randomized complete blocks arrangement with 3 replications was used, where <br/>main plots were devoted to N levels (low; 40 kg N, medium; 120 kg N and high; 200 kg <br/>N/fed), sub-plots to plant densities (20, 30 and 40 thousand plants/fed) and sub-sub plots to <br/>maize genotypes. Some newly developed maize hybrids gave very high grain yield, reaching <br/>54 ard/fed (ca. 20 t/fed) in the cross IL53×IL84, when were grown under high plant density <br/>(40,000 plants/fed) and were given the highest N fertilization rate (200 kg/fed). Moreover, <br/>some crosses (L17 × L54, IL53×IL84, L17×IL80, L28×IL84 and L17×L28) gave >44 ard/fed <br/>under 40,000 plant density and using 120 kg N/fed. The inbreds L17, L21, L14 and L28 <br/>proved to be tolerant (T), while IL80, IL53, IL51 and IL84 were sensitive (S) to HD and/or <br/>LN. T×T group of crosses exhibited better values in most studied traits than T×S and S×S <br/>groups of crosses under both stresses. Both dominance and additive variances were significant, <br/>but the estimates of dominance were much higher, in magnitude, than additive variance for all <br/>studied traits under most environments, suggesting that heterosis breeding is the method of <br/>choice for improving adaptability traits to both HD and LN stresses. The degree of dominance <br/>was overdominance in most cases. For all studied traits under all environments, narrow-sense <br/>heritability was generally of small magnitude (<15%), but reached ˃30% in LANG, PLE, PLB, <br/>KPP, GYPP. Expected genetic advance from selection (based on 10% selection intensity) was <br/>generally of small magnitude, but reached its maximum for grain nitrogen under E5 (48.42%). <br/>The highest heritability along with the highest expected genetic gain from selection were <br/>achieved by the traits LANG, SDL, SDU, PLE, PLB, ELA, leaf area produced 1g grain under <br/>severe stress of both HD and LN together and plant height, rows/ear, kernels/row, 100-kernel <br/>weight under stressed environment for high density. |
| 520 ## - SUMMARY, ETC. |
|---|
| Summary, etc. |
تم استعمال مجموعة من سلالات الذرة الشامية ذات اختلاف واضح في صفاتها التأقلمية لاجهادي الكثافة النباتية العالية والنيتروجين المنخفض كآباء للهجن التبادلية لدراسة طبيعة توارث هذه الصفات، وتحديد التراكيب الوراثية المتحملة لكلا الاجهادين وكذلك الكثافة النباتية المثلى ومعدل التسميد المناسب لتعظيم محصول حبوب الفدان. بعض الهجن الجديدة أعطت محصول حبوب عالي جداً، عندما زرعت تحت كثافة نباتية عالية وأعطيت معدل التسميد النيتروجيني العالى. كان كلاً من تباين السيادة والتباين المضيف عالي المعنوية ، ولكن تقديرات تباين السيادة كانت اكبر كثيراً في المقدار من تقديرات التباين المضيف، في كل الصفات تحت الدراسة تحت كل البيئات. كفاءة التوريث بالمعنى الخاص كانت صغيرة في المقدار، ولكنها وصلت لاكثر من 30٪ لصفات زاوية الورقة ونفاذ الضوء حتى الكوز وحتى قاعدة النبات وعدد حبوب النبات ومحصول حبوب النبات. |
| 530 ## - ADDITIONAL PHYSICAL FORM AVAILABLE NOTE |
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| Issues CD |
Issued also as CD |
| 546 ## - LANGUAGE NOTE |
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| Text Language |
Text in English and abstract in Arabic & English. |
| 650 #7 - SUBJECT ADDED ENTRY--TOPICAL TERM |
|---|
| Topical term or geographic name entry element |
Corn |
| Source of heading or term |
qrmak |
| 653 #0 - INDEX TERM--UNCONTROLLED |
|---|
| Uncontrolled term |
gene action |
| -- |
combining ability |
| -- |
genetic advance |
| -- |
heritability |
| 700 0# - ADDED ENTRY--PERSONAL NAME |
|---|
| Personal name |
Ahmed Medhat Mohamed Al-Naggar |
| Relator term |
thesis advisor. |
| 700 0# - ADDED ENTRY--PERSONAL NAME |
|---|
| Personal name |
Mohamed Reda Ali Shabana |
| Relator term |
thesis advisor. |
| 700 0# - ADDED ENTRY--PERSONAL NAME |
|---|
| Personal name |
Mosaad Soliman Hassanein |
| Relator term |
thesis advisor. |
| 900 ## - Thesis Information |
|---|
| Grant date |
01-01-2024 |
| Supervisory body |
Mosaad Soliman Hassanein |
| -- |
Mohamed Reda Ali Shabana |
| -- |
Ahmed Medhat Mohamed Al-Naggar |
| Discussion body |
Tamer a. El-sayed abdallah |
| -- |
Mohamed Mohamed m. Atta |
| Universities |
Cairo University |
| Faculties |
Faculty of Agriculture |
| Department |
Department of Agronomy |
| 905 ## - Cataloger and Reviser Names |
|---|
| Cataloger Name |
Nourhan |
| Reviser Names |
Huda |
| 942 ## - ADDED ENTRY ELEMENTS (KOHA) |
|---|
| Source of classification or shelving scheme |
Dewey Decimal Classification |
| Koha item type |
Thesis |
| Edition |
21 |
| Suppress in OPAC |
No |
