I= PHOSPHORUS REQUIREMENT OF MAIZE IN RELATION TO SOIL CHARACTERISTICS
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Title of Thesis
PHOSPHORUS REQUIREMENT OF MAIZE IN RELATION TO SOIL CHARACTERISTICS

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
No Abstarct

Download Full Thesis
1406.23 KB
S. No. Chapter Title of the Chapters Page Size (KB)
1 0 Contents
80.67 KB
2 1 Introduction 1-5
36.1 KB
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
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
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
6 5 Conclusions 187-190
30.13 KB
7 6 Summary 191-199
74.09 KB
8 7 Literature Cited 200-216
147.72 KB