The role and function of organic matter in tropical soils

  title={The role and function of organic matter in tropical soils},
  author={Eric T. Craswell and R. D. B. Lefroy},
  journal={Nutrient Cycling in Agroecosystems},
Soil organic matter (SOM) has many functions, the relative importance of which differ with soil type, climate, and land use. Commonly the most importantfunction of OM in soil is as a reserve of the nitrogen and other nutrients required by plants, and ultimately by the human population. Other important functions include: the formation of stable aggregates and soil surface protection; maintenance of the vast array of biological functions, including the immobilization and release of nutrients… 

Soil organic matter as sole indicator of soil degradation

A generalized assessment of the current state of knowledge on the usefulness of SOM based on its influence on the physical, chemical and biological properties and processes of soils is provided, with emphasis on the effect of SOM on soil structure and availability of plant nutrients.

Options for Soil Organic Matter Fractionation in Tropical Soils

Soil organic matter (SOM) plays an important role in maintaining the productivity of tropical soils. An estimated 70% of the terrestrial C stocks that participate in the atmospheric C cycle are

Could Soil Acidity Enhance Sequestration of Organic Carbon in Soils

On the basis of field and laboratory measurements of the dynamics of soil organic matter (SOM) in Japan, Thailand, Indonesia, Kazakhstan, and Ukraine having different soil pH levels, we postulate

Organic Matter and Micro-Organisms in Tropical Soils

The effects of soil properties and land-use management on soil organic matter, soil microbial biomass and microbial activity, as well as their interrelationships, were investigated in tropical soils.

Soil carbon and nitrogen losses following deforestation in Ethiopia

Ethiopia faces high risk of soil carbon depletion for nearly half of its total land mass largely due to forest clearing and continuous cultivation. Conversion of natural ecosystems to cultivated

Role of Organic Matter on Charge Behavior of Oxisols and Ultisols Under Tropical Savanna and Tropical Monsoon Climates in Thailand

Abstract Organic matter (OM) is known to play a role in maintaining soil fertility through its influence on surface charge to adsorb nutrient ions in soils. Its effect is vital but variable. In this

Microbial diversity and organic matter fractions under two arid soils in Algerian Sahara

The Algerian Sahara is characterized by a heterogeneity of edaphic conditions and climatic dissimilarities; however, information on biological indicators of arid soils is weakly documented in this

Soil organic matter decomposition: effects of organic matter addition on phosphorus dynamics in lateritic soils

Relationships between the persistence of organic matter added to soil, the dynamics of soil organic carbon (C) and phosphorus (P) were examined in four experiments on lateritic soils of Western



The importance and management of soil organic matter in the tropics

Soil organic matter is an important regulator of numerous environmental constraints to crop productivity. Mineralisation of decomposing residues is a major source of plant nutrients in highly


Soil organic matter is a key component of all terrestrial ecosystems, and any variation in its composition and abundance has important effects on many of the processes that occur within the system.

Nutrient resources for crop production in the tropics

World population growth will cause a doubling in nutrients requirements for the developing world by 2020, which, in the likely case of inadequate production, will need to be met from soil reserves, because expansion of the cultivable land area is reaching its limits.

The role of active fractions of soil organic matter in physical and chemical fertility of Ferrosols

The relationships between fractions of soil organic carbon (C) oxidised by varying strengths of potassium permanganate (KMnO4) and important soil physical and chemical properties were investigated

Using active fractions of soil organic matter as indicators of the sustainability of Ferrosol farming systems

Chemical and physical degradation of Red Ferrosols in eastern Australia is a major issue necessitating the development of more sustainable cropping systems. This paper derives critical concentrations

Soil Carbon Fractions Based on their Degree of Oxidation, and the Development of a Carbon Management Index for Agricultural Systems

The fractionation procedure and CMI outlined can be used to determine the state and rate of change in soil C of agricultural and natural systems.

Influence of management on the composition of organic matter in a red-brown earth as shown by 13C nuclear magnetic resonance

Samples were obtained from the same red-brown earth: (a) in an undisturbed state, (b) after 60 years of an exploitive wheat-fallow rotation and (c) after 40 years under a fertilized mixed

Physical Fractionation of Soil and Organic Matter in Primary Particle Size and Density Separates

The soil organic matter (SOM) pool encompasses plant, animal, and microbial residues in all stages of decay and a diversity of heterogeneous organic substances intimately associated with inorganic