Phosphorus in Organic Waste-Soil Systems

Abstract

Increases in the generation of organic wastes, in addition to decreases in natural resources, make it necessary to recycle these waste materials. In soils, the application of wastes as organic fertilizers, allows to reincorporate nutrients to the biogeochemical cycles. The application of wastes in agriculture has carried out with it problems associated with phosphorus (P) overapplication in soils and contamination of water bodies. Phosphorus inside the waste matrix forms organic and inorganic compounds which have different bioavailabilities. The more important factors that influence the bioavailability of P in soils, organic wastes and soil-organic waste amendments are: the soil solution pH, adsorption reactions, organic matter, phosphatase activity and low molecular weight of organic acids. In the wide range of organic wastes, purines and compost have been selected to illustrate the effects of the factors previously mentioned on the bioavailability of P in soils. According to the analyzed information, we can suggest that it would be necessary to implement technologies to increase the bioavailability of P in the waste matrix to produce an efficient organic fertilizer with high P bioavailibility when it is applied in soils. According to the analyzed information, we can suggest that it would be necessary in the prospect future, the possibility to studynew technologies for increase the bioavailability of P in the waste matrix to produce an efficient organic fertilizer with high P bioavailibility when it is applied in soils.

Characteristics of municipal landfill leachate and its impact on surrounding agricultural land

“…The high N concentration in all leachate samples might be due to the refuse dumps that can lead to increase N concentrations (Abbas et al 2009). Disposal of organic waste (mainly vegetable waste) might contribute to increase the phosphorus concentration in leachate sample (Fuentes et al 2006). …”

Recycling of Organic Wastes for Sustainable Soil Health and Crop Growth

“…The long term application of maize residues may increase the levels of P and K in the soil [24]. During decomposition process, organic P in crop residues could provide a relatively labile form of P to succeeding crops, thus, providing a larger pool of mineralizable soil organic P to supplement soluble inorganic phosphorus pools [25,26]. The increase in available phosphorus concentration in organic waste treatments with recommended fertilizer could be due to high microbial activity induced by the addition of organic residues and soluble inorganic phosphorus, which speed up phosphorus cycling [27].…”

Phosphorus forms in some grassland soils in Wielkopolska region: characterisation and availability for plants

“…precipitation, sorption, mineralization and leaching. Taking into account these factors identification of phosphorus in soils is a fundamental prerequisite to understanding nutrient dynamics in soil systems and the mechanisms responsible for the rate of release of potentially available forms of phosphorus for plants (Fuentes et al, 2006). Moreover, Szara and Sosulski (2012) stressed that it is necessary to monitor agricultural soils in terms of their susceptibility to phosphorus losses.…”