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Iron Availability in Calcareous Soils

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Author

Faraz Ahmad

Program

PhD

Institute

University of Agriculture

City

Faisalabad

Province

Punjab

Country

Pakistan

Thesis Completing Year

2014

Thesis Completion Status

Completed

Subject

Botany

Language

English

Link

http://prr.hec.gov.pk/jspui/bitstream/123456789/2424/1/3028S.pdf

Added

2021-02-17 19:49:13

Modified

2024-03-24 20:25:49

ARI ID

1676726523891

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Iron (Fe) is a widely deficient micronutrient in agriculture particularly on alkaline and calcareous soils due to formation of insoluble compounds in soil as well its inactivation in plant body. Several soil-related characteristics may lead to development of Fe chlorosis. Prediction of development of Fe chlorosis on basis of single soil parameter is not easy for perennial crops. To cure Fe deficiencies, right choice of rootstock and efficient Fe sources for soil application need to be explored. The present project was designed to study the different soil Fe forms, soil properties and their relation with citrus leaf Fe. For soil solution Fe studies, Buchner Funnel Technique (BFT) was used to determine water soluble Fe in different soils and Fe buffer power of different soils. Different Fe sources were tested in their ability to provide soluble Fe over period of time. Responses of different citrus rootstock seedling were evaluated in calcareous medium. DTPA-extractable Fe and water soluble Fe though represents the available Fe in soils were found unable to justify the symptoms of Fe chlorosis on citrus leaves in our study. Ferrihydrite Fe oxide is the main source of soil Fe in calcareous soils and controls plant available Fe at each depth. Soil pH was found in inverse relation to leaf active Fe. Water soluble Fe extracted from different soils using BFT revealed that all soils were above the critical level of 1 μM Fe required for mass flow. While comparing different Fe sources, we found organic amendments better than inorganic amendments in their ability to supply Fe over long period of time. Inorganic Fe sources rapidly became insoluble regardless of soil type. Vivianite was found slightly resistant to oxidation as compared to FeSO 4 . Among chelates EDDHA is highly stable as compared to DTPA. Citrus rootstock seedlings responded differently with application of Fe with and without CaCO 3 in growth medium. Rootstocks differed in their ability to take up Fe from CaCO 3 medium and to efficiently utilize Fe. Rough lemon found to be efficient rootstock to cope Fe nutrition disorders
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کر کجھ اپنا آپ گمان

کر کجھ اپنا آپ گمان
پہلے اپنی ذات پچھان
توں ایں خالق دا شہکار
تیری سب توں اچی شان
تینوں عشق نے طاقت بخشی
توں بنیا حضرت انسان
تیرے اندر یار دا ڈیرہ
تیرے اندر کل جہان
تیری خاطر خلق اپائی
تیری خاطر جگ جہان
میرے نبیؐؐ دا نوکر بن
رب فرمایا وچ قرآن
تیرا رب شہ رگ توں نیڑے
تینوں دور کیتا شیطان

الحياة الاقتصادية بمنطقتي الساقية الحمراء ووادي الذهب

تأتي الدراسة بهدف تقديم مقاربة علمية حول أبرز مظاهر الحياة الاقتصادية التي شهدتها منطقتي الساقية الحمراء ووادي الذهب الواقعة ضمن مجال الجنوب المغربي، حيث يتميز هذا المجال بغنى متنوع شمل مختلف المناشط الاقتصادية على الرغم من قساوة الظروف الطبيعية التي تعرفها دواخل صحراء جنوب المغرب، الأمر الذي حفزنا إلى البحث العلمي الدقيق حول بعض مظاهر هذه الثروات، مسلطين الضوء على موضوع الحياة الاقتصادية بمنطقتي الساقية الحمراء ووادي الذهب، وذلك سعيا منا لمواصلة خدمة البحث العلمي والأكاديمي حول هذا المجال.

Factors Promoting Excellence in Schools

The study, “Factors Promoting Excellence in Schools” took cognizance of the pressing problem that there was widespread deterioration of education in Khyber Pakhtunkhwa Province of Pakistan. The stakeholders had many expectations from the secondary schools both in public (government) and private sectors. The parents also needed feedback and authentic information about the criteria of excellent schools. It was therefore considered imperative to identify factors that promoted excellence in schools on the basis of information obtained from review of global literature as well as the feedback provided by stakeholders in the form of their responses. The items included in the opinionnaires and interviews for principals, teachers, parents and students were mostly derived from the authentic sources that were studied. For the purpose of obtaining relevant information from participants items were mentioned under different categories such as school specific statements, school improvement strategies and the skills of effective principals. The population of the study included 247 principals/headmasters, 2964 teachers, 494 parents and more than 10,000 students of 10th class in total number of 247 boys’ high schools in Peshawar City including 27 schools in public (government) and 220 in private sector in Khyber Pakhtunkhwa province of Pakistan. The sample included 30 principals, 60 teachers, 600 students of 10th class and 60 parents. The primary data were collected through opinionnaires administrated to principals/headmasters, teachers and students, while closed-ended interviews were held with purposively selected parents. The results of Board of Intermediate and Secondary Education Peshawar for 10th class of the sampled schools for the last 03 years (2008-10) were also made part of secondary data. The data received both quantitative and qualitative treatment. The quantitative analysis applied statistical measures to some of the aspects of the collected data. The data were analyzed with the help of tables and graphs and rendered meaningful with discussion and interpretation. The qualitative data were placed under different patterns and categories for discussion. The outcome of the study indicated that excellence was multi-dimensional phenomenon and, therefore, many factors collectively contributed to effectiveness of school. The most important factors included relevant curricula, devoted and well trained teachers, co- curricular activities, effective principals, collegiality of teachers and the needed infrastructure. The interventional role of principals also made difference in school effectiveness. They could intervene in matters of instructional supervision, efficient administration, promoting collegiality of teachers, and including them in decision-making processes. The positive school-community relationships were also instrumental in school effectiveness. The study found that excellent schools had effective classroom interaction, stakeholders’ consideration that it was better school for teaching-learning and both teachers and students were proud of the effectiveness of their schools. The recommendations of the study were a set of general and specific factors developed on the basis of review of literature and responses of subjects of different categories. They included a focus on within and out of school factors such as leadership skills of principals, qualified and devoted teachers, better school environment and infrastructure as well as effective school-home relationships. The study answered all the four research questions that were posed in the study.