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| Pakistan Research Repository | Home |
Title of Thesis |
| Author(s) Eshan ul Haq Ch. |
| Institute/University/Department Details University Of Agriculture, Faisalabad/ Institute Of Soil & Environmental Sciences |
| Session 2003 |
| Subject Soil & Environmental Sciences |
| Number of Pages 216 |
| Keywords (Extracted from title, table of contents and abstract of thesis) soil & environmental sciences, phosphorus, isotherms, adsorption, calcareous soils, equilibration, langmuir, freundlich |
Abstract |
| Download Full Thesis |  1406.23 KB |
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| S. No. | Chapter | Title of the Chapters | Page | Size (KB) |
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| 1 | 0 | Contents | 80.67 KB |
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| 2 | 1 | Introduction | 1-5 | 36.1 KB |
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| 3 | 2 | Review Of Literature | 6-42 | 268.33 KB |
| 2.1 | Scope Of The Problems | 6 | ||
| 2.2 | Phosphorus Statues Of Pakistan Soils | 8 | ||
| 2.3 | Factors Affecting Phosphorus Adsorption | 11 | ||
| 2.4 | Phosphorus Adsorption Isotherms | 16 | ||
| 2.5 | Reactions Of P With Soil Constituents | 22 | ||
| 2.6 | Availability Of P In Calcareous Soils | 33 | ||
| 2.7 | Phosphorus Requirement Of Crops | 38 | ||
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| 4 | 3 | Materials And Methods | 43-66 | 177.73 KB |
| 3.1 | Soils And Their Preparation | 43 | ||
| 3.2 | Methods Of Analysis For Irrigation Water | 49 | ||
| 3.3 | Methods Of Analysis For Plants | 52 | ||
| 3.4 | Laboratory Studies | 53 | ||
| 3.5 | Adsorption Study | 54 | ||
| 3.6 | Extraction Of Adsorbed P | 59 | ||
| 3.7 | Pot Experiments | 60 | ||
| 3.8 | Field Experiment | 62 | ||
| 3.9 | Soil Equilibrated P Recovery | 64 | ||
| 3.10 | Phosphorus Fertilizer Recommendation Based On Soil Test Values | 65 | ||
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| 5 | 4 | Results And Discussion | 67-186 | 855.71 KB |
| 4.1 | Characteristics Of The Adsorption Curves After 24hours Equilibration | 67 | ||
| 4.2 | Characteristics Of The Adsorption Curves After 3 Days Equilibration | 81 | ||
| 4.3 | Characteristics Of The Adsorption Curves After 6 Days Equilibration | 91 | ||
| 4.4 | Characteristics Of The Adsorption Curves After 12 Days Equilibration | 101 | ||
| 4.5 | Comparison Of The Langmuir And The Freundlich Isotherms | 110 | ||
| 4.6 | Kinetics Of Phosphorus Exchange | 113 | ||
| 4.7 | Extraction Of Adsorbed Phosphorus | 120 | ||
| 4.8 | Phosphorus Requirement Of Soils After 24 Hours Equilibration | 129 | ||
| 4.9 | Plant Response To Phosphorus Application | 150 | ||
| 4.10 | Phosphorus Requirement Of Maize (Field Expt) | 163 | ||
| 4.11 | Assessment Of Soil Equilibrated P Recovery | 173 | ||
| 4.12 | Soil Test Calibration For Determining Soil Solution P Levels For Maize | 185 | ||
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| 6 | 5 | Conclusions | 187-190 | 30.13 KB |
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| 7 | 6 | Summary | 191-199 | 74.09 KB |
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| 8 | 7 | Literature Cited | 200-216 | 147.72 KB |
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