Phosphorus concentration and fractionation

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Table of contents

Chapter I. General introduction 
1.1 General introduction
1.2 Phosphorus status of pasture ecosystems
1.3 Phosphorus cycling in pasture soils
1.3.1. Soil phosphorus forms
1.3.2. Phosphorus inputs and outputs
1.4. Plant available phosphorus in pasture soils and its uptake by plants
1.5. Managements practices to improve soil phosphorus availability
1.5.1. Mowing, grazing, and stocking density
1.5.2. Pasture plant species
1.5.3. Animal manure input as fertilization management
1.6. Conclusion and perspectives
Hypothesis
General objective
Specific objectives
CHAPTER II. “Soil available P on southern Chilean pastures under composted poultry manure is regulated by soil organic carbon, and iron and aluminum complexes”
Abstract
2.1 Introduction
2.2 Material and methods
2.2.1 Study farms and soil sampling
2.2.2. Chemical characterization of poultry manure compost and soil
2.2.3. Phosphorus concentration and fractionation
2.2.4. Soil particle size distribution
2.2.5. Statistical analysis
2.3 Results
2.3.1. Chemical characterization of PM added to pasture soils
2.3.2. Soil chemical characterization and soil particle size distribution on Andisols under pastures amended with PM
2.3.3. Soil phosphorus distribution of Andisols under pastures amended with PM
2.3.4. Relationship between soil parameters and soil particle size
2.4 Discussion
2.5 Conclusions
CHAPTER III. “Synergistic and Antagonistic effect of poultry manure and phosphate rock on soil P availability, ryegrass production, and P uptake”
Abstract
3.1 Introduction
3.2 Materials and methods
3.2.1. Materials
3.2.2. Growth chamber experiment
3.2.3. Soil analyses
3.2.4. Biomass analyses
3.2.5. Synergistic and antagonistic effect of mixture
3.2.6. Statistical analysis
3.3 Results
3.3.1. Total soil C, N and P concentration
3.3.2. Soil phosphorus forms
3.3.3. Microbial biomass P
3.3.4. Shoot and root biomass production
3.3.5. Shoot and root concentrations and uptake
3.3.6. Relationship between soil parameters and plant parameters
3.3.7. Synergistic and antagonistic effect between PM and RP on soil plant parameters
3.4 Discussion
3.4.1. Impact of organic and inorganic P amendments on C, N, and P stoichiometry and microbial biomass P
3.4.2. Impact of organic and inorganic P amendments on nutrient uptake and biomass production and soil P forms
3.4.3. Synergistic and antagonistic effect of the combined application of PM and RP
3.5 Conclusions
CHAPTER IV. “Impact of poultry manure and rock phosphate amendment on C allocation in the rhizosphere of ryegrass plants”
4.1 Introduction
4.2 Materials and Methods
4.2.1. Materials
4.2.2. Growth chamber experiment
4.2.3. Microbial biomass C
4.2.4. Soil organic matter density fractionation
4.2.5. Sources of soil organic carbon
4.2.6. Statistical analysis
4.3 Results
4.3.1. Microbial biomass C
4.3.2. Plant-derived C, poultry manure compost- derived carbon, and native rhizosphere soil C
4.3.3. Total C and N derived from plant and poultry manure compost input and their distribution in SOM fractions
4.4.4. Relationship between parameters
4.4 Discussion
4.4.1. Effect of amendments on soil C and N status
4.4.2. Effect of amendments on C transfer from plant to soil
4.5 Conclusions
Chapter V. “General discussion and concluding remarks” 
5.1 General discussion
5.2 Concluding remarks and future directions
References