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Leonardos, O. H.; Theodoro, Suzi Huff; Assad, Maria Leonor Lopes

doi:10.1023/a:1009855409700

Cited by 58 publications

(15 citation statements)

References 5 publications

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“…These results are in accord with the general findings indicated by plant growth and yield reported by workers from Australia and Brazil (Harley and Gilkes 2000;Leonardos et al 2000). On the other hand addition of organic manures such as CWC may not release these micronutrients in adequate amounts to meet crop needs since they may retain Zn and some other micronutrients.…”

Section: Discussionsupporting

confidence: 90%

“…Rock mineral flour are the byproducts of mining industry and differ considerably in the composition and have recently been used for meeting plant nutrient needs in Australia (Bolland and Baker 2000); in Germany (von Wilpert and Lukes 2003) and in Brazil (Theodoro and Leonardos 2006). Agro minerals include geological materials that contain one or more recognized essential plant nutrients and are called 'rock fertilizers' (Benetti 1983;Appleton 1990;van Straaten 2002) or 'petrofertilizers' (Leonardos et al 1987;Mathers 1994;Leonardos et al 2000) and are finely ground rocks (rock flour) of different compositions, and are used on all continents. Rock mineral flour especially a byproduct of rock crushed for technical purposes, an energy-consuming system based on fossil fuels, has not been available before the 20th century.…”

Section: Introductionmentioning

confidence: 99%

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Mineralization of copper, manganese and zinc from rock mineral flour and city waste compost for efficient use in organic farming

2009

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Restricted supply of micronutrients is a common constraint for plant growth worldwide, especially in organic farming systems where nutrients supply to crops mostly depends on the mineralization of native soil organic matter, decomposition of applied manures and crop residues. A laboratory incubation study was therefore conducted to investigate the potential release of copper (Cu), manganese (Mn) and zinc (Zn) from the rock mineral flour (RMF) and city waste compost (CWC) as compared to inorganic micronutrient fertilizers for 140 days. Release of the micronutrients from RMF and CWC showed different trends. The results showed that about 4.6% of Cu added as RMF was released irrespective of the quantity of the RMF applied. However, Cu release from CWC increased from 0.7 to 3.5% as the amount of compost added was increased. Copper recovery from copper sulphate was 98%.Manganese release from RMF decreased from 114 to 103% as the RMF level was increased, while the corresponding decrease in Mn release from CWC was from 14 to −3%. Manganese recovery from manganese sulphate was 100%. Zinc release from RMF increased from 5.8−15.5%, with an increase in the amount of RMF applied, while no Zn was released from CWC. Recovery of Zn from zinc sulphate was 98%. These results show that RMF and CWC could be used to meet Cu, Mn and Zn requirements of organically grown cereals. The results of the investigation have general applicability in organic farming.

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Section: Discussionsupporting

confidence: 90%

Section: Introductionmentioning

confidence: 99%

Mineralization of copper, manganese and zinc from rock mineral flour and city waste compost for efficient use in organic farming

2009

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“…Moreover, substantial leaching of salts from agricultural fields can lead to the accumulation of chlorides and nitrates in ground water causing long-term environmental issues related to the sink capacity of the earth. 1,[5][6][7][8] Therefore, a green alternative source of potassium needs to be earth-abundant and must allow controlled availability of K with a minimal co-release of environmentally harmful elements. In this context, earthabundant potassium-bearing rocks may offer a suitable alternative.…”

Section: Antoine Allanorementioning

confidence: 99%

Aqueous alteration of potassium-bearing aluminosilicate minerals: from mechanism to processing

Skorina

Allanore

2015

Green Chem.

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“…Despite the importance of such minerals being generally neglected due to their low price in the international market, they present a high potential for local development (Franks, 2020). In Brazil, the adoption of rock powder as a remineralizer has been a matter of intense and prolific agronomic research which resulted in a movement known as "rochagem" (Leonardos et al, 2000). The use and commercialization of such materials are regulated by law 12.890 (Brazil, 2013).…”

Section: "Rocks For Crops": An Eco-friendly and Low-cost Source Of Numentioning

confidence: 99%

Use of Mineral Weathering Bacteria to Enhance Nutrient Availability in Crops: A Review

et al. 2020

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Rock powders are low-cost potential sources of most of the nutrients required by higher plants for growth and development. However, slow dissolution rates of minerals represent an obstacle to the widespread use of rock powders in agriculture. Rhizosphere processes and biological weathering may further enhance mineral dissolution since the interaction between minerals, plants, and bacteria results in the release of macro- and micronutrients into the soil solution. Plants are important agents in this process acting directly in the mineral dissolution or sustaining a wide diversity of weathering microorganisms in the root environment. Meanwhile, root microorganisms promote mineral dissolution by producing complexing ligands (siderophores and organic acids), affecting the pH (via organic or inorganic acid production), or performing redox reactions. Besides that, a wide variety of rhizosphere bacteria and fungi could also promote plant development directly, synergistically contributing to the weathering activity performed by plants. The inoculation of weathering bacteria in soil or plants, especially combined with the use of crushed rocks, can increase soil fertility and improve crop production. This approach is more sustainable than conventional fertilization practices, which may contribute to reducing climate change linked to agricultural activity. Besides, it could decrease the dependency of developing countries on imported fertilizers, thus improving local development.

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Untitled

Cited by 58 publications

References 5 publications

Mineralization of copper, manganese and zinc from rock mineral flour and city waste compost for efficient use in organic farming

Mineralization of copper, manganese and zinc from rock mineral flour and city waste compost for efficient use in organic farming

Aqueous alteration of potassium-bearing aluminosilicate minerals: from mechanism to processing

Use of Mineral Weathering Bacteria to Enhance Nutrient Availability in Crops: A Review

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