| dc.creator | Santos, Wedisson Oliveira | |
| dc.creator | Mattiello, Edson Marcio | |
| dc.creator | Vergutz, Leonardus | |
| dc.creator | Costa, Rodolfo Fagundes | |
| dc.date | 2018-09-25T12:32:16Z | |
| dc.date | 2018-09-25T12:32:16Z | |
| dc.date | 2016-06-15 | |
| dc.date.accessioned | 2023-09-27T20:39:30Z | |
| dc.date.available | 2023-09-27T20:39:30Z | |
| dc.identifier | 15222624 | |
| dc.identifier | http://dx.doi.org/10.1002/jpln.201500484 | |
| dc.identifier | http://www.locus.ufv.br/handle/123456789/21980 | |
| dc.identifier.uri | https://repositorioslatinoamericanos.uchile.cl/handle/2250/8946047 | |
| dc.description | Rising price and limited geographical availability of traditional sources of potassium (K) fertilizers have stimulated a search for alternative K sources in different parts of the world. We evaluated mineral transformations and agronomic properties of an alternative source of K produced through thermal and chemical treatment of the verdete rock (VR). Chemical and mineralogical characteristics were evaluated before and after each treatment. Four K sources (verdete rock, KCl, acidified verdete, and calcinated verdete) were applied to a Typic Hapludox at different rates. Eucalyptus and sequentially cropped maize and grass were grown in the treated soils. Ver-
dete rock, which contained glauconite and microcline as K crystalline minerals, had very low solubility in water and in citric acid. Thermal and chemical treatments increased the concentration of water soluble K and citric acid soluble K. These treatments also caused crystalline K minerals to collapse and form sylvite and arcanite. Untreated verdete rock was not suitable as a K source for maize (Zea mays L.) and eucalyptus (Eucaliptus urograndis I144). Thermal and chemical
treatments increased agronomic performance of VR to be similar to KCl. When K was applied as K-calcined verdete, 82% of the total K was recovered in maize and grass cultivations. Less K
was recovered in plant following addition of K-acidified verdete and KCl (72% and 77%, respectively). Potassium recoveries by eucalyptus were about 52, 53, and 60% of the amount applied
of calcined verdete, acidified verdete, and KCl, respectively. Both calcination and thermal treatment increased the K uptake and dry matter production for all plant species tested to be similar to KCl suggesting that this silicate rock could be beneficiated to be an effective K fertilizer. | |
| dc.format | pdf | |
| dc.format | application/pdf | |
| dc.language | eng | |
| dc.publisher | Journal of Plant Nutrition | |
| dc.relation | v. 179, n. 4, p. 547- 556, ago. 2016 | |
| dc.rights | Open Access | |
| dc.subject | Glauconitic rock | |
| dc.subject | Sources of K | |
| dc.subject | Verdete | |
| dc.title | Production and evaluation of potassium fertilizers from silicate rock | |
| dc.type | Artigo | |
