Organic amendments for crop production, phosphorus bioavailability and heavy metal immobilisation: a review

Abstract

Repeated and excessive use of inorganic phosphorus fertilisers adversely affects soil fertility, reduces plant phosphorus (P)-use efficiency, increases soil heavy metal concentrations and poses human health risks via food chain interaction. Organic amendments (OAs) are considered as cost-effective and environment-friendly supplement to inorganic P fertilisers that are produced from scarce phosphate rocks. Numerous studies have reported the synergistic and antagonistic effects of OAs on crop production, P solubility and availability, and immobilisation of heavy metals. However, the results of these studies are found to be variable and demand a critical review. This article summarises the environmental and health implications of continuous inorganic P fertilisers application along with a detailed overview of commonly available OAs and their efficacy to stimulate plant growth and yield. Moreover, this review describes the potentiality of OAs to increase the bioavailability of P in soil, discusses how and to what extent these soil amendments can immobilise heavy metals and reduce plant uptake, and finally provides future research directions for organic farming and sustainable agricultural practices.

Mineral biofortification and metal/metalloid accumulation in food crops: recent research and trends (Part III)

“…Sohail et al (2022) reviewed the agronomic and genetic approaches that are important for producing cereal grains high in Fe but low in toxic metal(loid)s [such as Cd, lead (Pb) and arsenic (As)]. Mamun et al (2022) summarised the latest reports on the use of various organic amendments for soil immobilisation of metals contained in P fertilisers. In tomato plants, application of extract from Halopteris filicina (macro-alga) decreased Pb accumulation, with concurrent stabilisation of genomic DNA and stimulation of plant growth (Unal et al 2022).…”

A Review on Nano Chitosan and Bio Capsules on Growth Yield and Quality of Strawberry

“…Research by Singh et al [17] recently, illicit fertilizer, pesticides, and biological monitoring findings have created environmental contamination in strawberry agriculture [18]. Chemical fertilizers increase crop productivity, but they also introduce harmful residues that harm humans, degrade sustainability, and pollute water [19]. Increasing strawberry cultivation is therefore virtually a formidable challenge [20].…”

Biosorption Potential of Arachis hypogaea-Derived Biochar for Cd and Ni, as Evidenced through Kinetic, Isothermal, and Thermodynamics Modeling

“…One of the most critical points in the use of adsorbents is the suitability of their porous structures, adsorption velocity, and total adsorption capacity. A wide variety of solid materials can be used as organic carbon and adsorbents, but biochar (BC) is the most economical and cost-effective carbonaceous product. − Major biomass materials used to prepare biochar are peanut shells, ryes, grass, rice husks, garlic stalk, straw, metropolitan solid waste, and wood waste products. An increase in the carbon content improves the biochar resistance to microbial decomposition.…”