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The Phosphorus Cycle

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Unlike carbon, water, and nitrogen, phosphorus is not present in the atmosphere as a gas. Instead, most phosphorus in the ecosystem exists as compounds, such as phosphate ions (PO43-), found in soil, water, sediment and rocks. Phosphorus is often a limiting nutrient (i.e., in short supply). Consequently, phosphorus is added to most agricultural fertilizers, which can cause environmental problems related to runoff in aquatic ecosystems.

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Updated: Jul 9, 2025

Measuring Phosphorus Release in Laboratory Microcosms for Water Quality Assessment

Measuring Phosphorus Release in Laboratory Microcosms for Water Quality Assessment

Published on: July 22, 2019

Phosphate solubilizing bacteria from soils with varying environmental conditions: Occurrence and function.

Walid Janati¹, Rachid Bouabid², Karima Mikou¹

¹Department of Biology, Functional Ecology and Environment Engineering Laboratory, Faculty of Science and Technology, Sidi Mohamed Ben Abdellah University, Fez, Morocco.

|December 8, 2023

Summary

Phosphate solubilizing bacteria (PSB) are crucial for plant phosphate uptake in Morocco

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Published on: August 26, 2016

Area of Science:

Agricultural Microbiology
Soil Science
Plant Nutrition

Background:

Moroccan semi-arid soils are nutrient-depleted, limiting small-scale farmers' access to inorganic fertilizers.
Phosphate solubilizing bacteria (PSB) offer a sustainable solution for plant phosphate supply.
A limited range of suitable PSBs and understanding of their ecological drivers hinder widespread application.

Purpose of the Study:

To investigate the influence of edapho-climatic factors on PSB abundance, potential, and diversity in Moroccan agricultural soils.
To correlate environmental variables with PSB P-solubilization capacity and plant growth-promoting (PGP) traits.
To identify bacterial genera and assess their PGP capabilities for agricultural enhancement.

Main Methods:

Isolation and characterization of 51 PSB strains from four Moroccan regions using National Botanical Research Institute's phosphate (NBRIP) agar.
Analysis of soil and climate data from sampling sites.
Testing of P-solubilization efficiency (Rock P and Tricalcium P) and plant growth-promoting traits.

Main Results:

PSB P-solubilization ranged from 18.69–40.43 mg.L-1 (Rock P) and 71.71–94.54 mg.L-1 (Tricalcium P).
PGP traits positively correlated with PSB abundance and edapho-climatic conditions.
Nine bacterial genera identified, including Bacillus, Pseudomonas, and Rhizobium, with varying PGP activities.

Conclusions:

Bacterial community density and potency are significantly influenced by temperature, precipitation, soil nutrients, and texture.
Edapho-climatic factors are key determinants of PSB effectiveness in Moroccan agroecosystems.
Optimizing PSB application requires consideration of specific ecological traits for enhanced agricultural productivity.