ALMEIDA, J. P. dE

BRAGA, C. S.

GABOS, M. B.

LEITE, A. A. da S.

MARTINS, E. de S.

OLIVEIRA, M. I. L. de

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516th World Fertilizer Congress of CIEC158Introduction In general, Brazilian  soils are poor in mac-ro and micronutrients. Brazil has only one produc-ing potash mine so that more than 90% has to be imported, despite its importance as food producer. This very uncomfortable dependence also has a Due to actual potash market, it is unlikely that any -oped in Brazil from the local potash salt deposits. Since 2011 TERRATIVA MINERAIS screened  locations close to agricultural regions from the Cerrado and with favourable geology and logistics, for syenite rock with up to 14.5% potash content and also high content of other macronutri-ents. This rocks are uncommon, but Terrativa was able to locate them in key areas by using modern 2O) and is planning the installation of four rock powder plants close to important agricultural zones from the Cerrado. A 2 year research program from TERRA-TIVA with the MIT/USA developed Hydrosyenite, a fertilizer produced from syenite by hydrotermal pro-cess, with controlled accelerated release of potash  In this way, the objective of this research for maize as indicator plant in pot experiment.MethodsThe experiment was conduced in greenhouse lo-cated at Embrapa Cerrados in Planaltina-DF. The treatments were the control (TE), 6 kind of silicated agrominerals (granulometry <0.15 mm), 2 doses and 3 repetitions. The silicated agrominerals were TA-15 (PRGB-PCER-MCA-RO0011/ 12,5 % de 22222 2O). The doses were calculated based on the recommended -12O), and another with the double of it (240 kg ha-1 of 2O). For this calculation were considered the total homogenized with 2 kg of soil (Oxisol), packed in 2L pots, and seeded 2 plants of corn each. Passed 45 days after emergency, the plants were collected and separated shoots and roots. All the material were dried at 60ºC, in the se-quence, were weighted to the dry mass evaluation and crushed to the chemical analysis (total extrac-tion). In the same period, the soils were collected, air dried and analysed for available amount of nutri-ents.Results and discussions  In the experiment was observed a incre-ment in the dry mass as a consequence of the in-1). In the low doses (40 and 80 kg ha-1) the dry mass addition were not different from the control treatment. The plants in the highest dose (240 kg ha-1) some silicate agrominerals showed a potencial TA-18 and TA-20. In the dose equivalent of 120 kg per ha of 2O the biotite schist (BX) had the better develop-ment compared with the others agrominerals. How-ever there are no difference in the dry mass pro-duction of both shoots as rootsif compared the BX with all agrominerals. The BX is the knowed silicate agromineral used as a rock control. With the application of increasing dose of -PERFORMANCE OF K SILICATE AGROMINERALS FOR CORN CROPMARIA INÊS LOPES DE OLIVEIRA1, ÉDER DE SOUZA MARTINS1, MARIANA B. GABOS1, FLÁVIA CRISTINA SILVEIRA BRAGA2, JOSIEL PEREIRA DE ALMEIDA1, ALBANO A. DA SILVA LEITE 21Embrapa Cerrados, BR 020 km 8, 73310-970, BRAZIL (minesoliveira2@gmail.com1)2 159Posters | Section 2 | Direct use of rock as fertilizerstreated with silicate agrominerals were simiar to the the treatments.dose (240 kg ha-1) plants from all the treatments treated with the rocks TA-15, TA-16, TA-17, TA-18 than in the BX treatment, showed similarproduction of shoot dry mass.biotite schist were higher than in the other treat-the amount of rock necessary to apply the same other rocks. For example, to apply the dose of 240 kg ha-1 2O is necessary the addition of 9.02 t ha-1 of biotite schist, and for the other rocks are -1, respectively Conclusions The silicate agrominerals TA-15, TA-18 e TA-20 were the promising rocks for the agricultural use, in the aspects of development, dry mass pro-soil. The TA-15 is from Bahia state (TERRATIVA Ceraíma Project – Silveira Braga , 2014), and the TA-20 is from Goiás state (TERRATIVA Serra das Araras Project – Oliveira , 2014a). Both are -spar syenite. The TA-18 is from Goiás state (TER-RATIVA Acreúna Project – Oliveira , 2014b) ugandite. agromineralReferencesEMBRAPA. 1997. Centro Nacional de Pesquisa de Solos. Manual de Métodos de Análise de Solo. 2ª ed. Rio de Janeiro, 212p.of the Brazilian Cerrado. In: 16th WORLD FERTILIZ-ER CONGRESS OF CIEC, 2014, Rio de Janeiro, Brazil. -th WORLD FER-TILIZER CONGRESS OF CIEC, 2014, Rio de Ja-neiro, Brazil. --ject: Biotite-bearing ultrapotassic deposit in Bahia state. In: 16th WORLD FERTILIZER CONGRESS OF CIEC, 2014, Rio de Janeiro, Brazil. 16th World Fertilizer Congress of CIEC160Figure 1. Dry mass production of corn plant (roots and shoots)culivated in soil pot with silicate agrominerals aplication.Figure 3.doses of silicate agrominerals.Figure 2. A B  00,511,52Dose 40 kg ha-1RaizPADose 80 kg ha-100,511,52 Dose 120 kg ha-1 Dose 240 kg ha-1Root Shoot Rock 

Performance of K Silicate agrominerals for corn crop.

http://www.alice.cnptia.embrapa.br/alice/bitstream/doc/1008384/1/S1871.pdf

Performance of K Silicate agrominerals for corn crop.

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