Fertilizer by Fusion of Rock Phosphate with Olivine

Walthall, J. H.; Bridger, G. L.

doi:10.1021/ie50403a007

Cited by 19 publications

(6 citation statements)

References 4 publications

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“…Alvarez and Datnoff, 2001]. The application of suitable rocks for mineral fertilization has been discussed for decades [van Straaten, 2002;Walthall and Bridger, 1943], and the large number of studies on this topic is more than that comprehensively surveyed here.…”

Section: Release Of Other Nutrients and Effects On Ecosystem Productimentioning

confidence: 99%

“…van Straaten, 2002, outlining the concept of "rocks for crops"] because silicate minerals contain most of the nutrients required by plants (with the exception of N). Powdered silicate rocks have even been considered as an alternative to conventional fertilization in areas where fertilizers are not available or are too expensive for many farmers, and in organic agriculture [Coroneos et al, 1995;Leonardos et al, 1987;Leonardos et al, 2000;Von Fragstein et al, 1988;Walthall and Bridger, 1943]. The potential for silicates to supply K [Manning, 2010] is notable because this critical nutrient is rapidly depleted from agricultural soils, particularly in the tropics.…”

Section: Wider Consequences For Agricultural Systemsmentioning

confidence: 99%

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Enhanced chemical weathering as a geoengineering strategy to reduce atmospheric carbon dioxide, supply nutrients, and mitigate ocean acidification

Hartmann

West

Renforth

et al. 2013

Reviews of Geophysics

450

341

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[1] Chemical weathering is an integral part of both the rock and carbon cycles and is being affected by changes in land use, particularly as a result of agricultural practices such as tilling, mineral fertilization, or liming to adjust soil pH. These human activities have already altered the terrestrial chemical cycles and land-ocean flux of major elements, although the extent remains difficult to quantify. When deployed on a grand scale, Enhanced Weathering (a form of mineral fertilization), the application of finely ground minerals over the land surface, could be used to remove CO 2 from the atmosphere. The release of cations during the dissolution of such silicate minerals would convert dissolved CO 2 to bicarbonate, increasing the alkalinity and pH of natural waters. Some products of mineral dissolution would precipitate in soils or be taken up by ecosystems, but a significant portion would be transported to the coastal zone and the open ocean, where the increase in alkalinity would partially counteract "ocean acidification" associated with the current marked increase in atmospheric CO 2 . Other elements released during this mineral dissolution, like Si, P, or K, could stimulate biological productivity, further helping to remove CO 2 from the atmosphere. On land, the terrestrial carbon pool would likely increase in response to Enhanced Weathering in areas where ecosystem growth rates are currently limited by one of the nutrients that would be released during mineral dissolution. In the ocean, the biological carbon pumps (which export organic matter and CaCO 3 to the deep ocean) may be altered by the resulting influx of nutrients and alkalinity to the ocean. This review merges current interdisciplinary knowledge about Enhanced Weathering, the processes involved, and the applicability as well as some of the consequences and risks of applying the method.

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Section: Release Of Other Nutrients and Effects On Ecosystem Productimentioning

confidence: 99%

Section: Wider Consequences For Agricultural Systemsmentioning

confidence: 99%

Enhanced chemical weathering as a geoengineering strategy to reduce atmospheric carbon dioxide, supply nutrients, and mitigate ocean acidification

Hartmann

West

Renforth

et al. 2013

Reviews of Geophysics

450

341

View full text Add to dashboard Cite

show abstract

“…The other is fusing the rock with different materials, such as silicates or sulfates, at temperatures higher than 1400°, followed by rapid cooling. The fluorine is not completely eliminated by this kind of treatment (Boylan and Larson, 1957;Bridger and Boylan, 1953;Walthall and Bridger, 1943).…”

Section: Defluorination Of Wagnerite Coproduced With Magnesium Phosph...mentioning

confidence: 96%

Defluorination of wagnerite coproduced with magnesium phosphate fertilizer

Faibis¹,

Schieber²,

Siniansky³

1973

J. Agric. Food Chem.

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“…The AOAC procedure for determining equivalent basicity (2), based on the work of Pierre et al (17)(18)(19), was developed primarily for mixed fertilizers and is seldom, if ever, used for straight phosphate materials (11). Preliminary calculations based on reported analyses of serpentine-and olivine-fused phosphates (4, 6-70, 13-16, 20,21) showed that, in the presence of 10 ml. of 2N sodium carbonate-sucrose solution, 30 ml.…”

Section: Chemical Analysismentioning

confidence: 99%