ResumoConsiderando a necessidade de avaliar a eficácia do pó de basalto como fonte de nutrientes e o efeito da adição de estercos animais sobre a dissolução desses materiais, foi instalado um experimento em casa de vegetação. Os tratamentos aplicados foram: controle; adubação convencional; 10,0, 20,0, 50,0 e 100,0 t.ha -1 de pó de basalto; e as mesmas doses de pó de basalto associado ao esterco bovino. Os tratamentos foram testados em mudas de clone de Eucalyptus benthamii. Todos os tratamentos foram comparados ao controle pelo teste de Duncan. A aplicação de pó de basalto promoveu aumento no valor do pH do solo para todas as doses. Os teores de Mg e Si trocável no solo foram maiores nos tratamentos com pó de basalto associado ao esterco bovino, o qual demonstrou ser um material que interfere na dissolução dos minerais e liberação desses elementos. O pó de basalto, em associação ou não com esterco bovino, conferiu teores de K nas folhas maiores que o tratamento controle. Concluise que doses a partir de 20 t.ha -1 de pó de basalto associadas ao esterco bovino apresentaram efeito no pH do solo e podem ser utilizadas como fonte de Mg, Si e K. Palavras-chave: Rochagem; minerais; fontes de nutrientes. Abstract Evaluation of application of basalt powder effects in soil fertility and Eucalyptus benthamii nutrition.In order to evaluate powdered basalt efficiency as a source of nutrients as well as effects of cattle manure on dissolution of these materials, it was improved an experiment in a greenhouse. The improved treatments were: control; conventional fertilization; 10.0, 20.0, 50.0 and 100.0 t ha -1 of basalt powder, and the same basalt powder doses associated with cattle manure. Such treatments had been tested on Eucalyptus benthamii seedlings. All treatments were compared to control by Duncan test. Basalt powder application promoted soil pH increasing in every doses. The contents of exchangeable Mg and Si were higher in treatments with powdered basalt associated with cattle manure, which proved to be a material that interferes in minerals dissolution as well as in release of such elements. The basalt powder, in association or not with cattle manure, imporved K contents in the leaves higher than the control ones. We can conclude that doses from 20 t ha -1 of basalt powder associated with cattle manure have effect on soil pH and can be use as a source of Mg, Si and K. Keywords: Stonemeal; minerals; source of nutrients. INTRODUÇÃOAs áreas de florestas plantadas com eucalipto no Brasil ocuparam 4.515.730 ha em 2009 (ASSOCIAÇÃO BRASILEIRA DE PRODUTORES DE FLORESTAS PLANTADAS (ABRAF), 2010), sendo parte dessa área situada em locais com risco de ocorrência de geadas, como em algumas regiões dos estados do Sul do país, onde as opções de plantio são restritas a poucas espécies que apresentam resistência ao frio, como Eucalyptus benthamii Maiden et Cambage (HIGA, 1999;GRAÇA et al., 1999).E. benthamii é uma planta nativa da Austrália, onde, originalmente, ocorre em solos férteis. Desse modo, para a espécie manifestar seu pote...
RESUMO. O teor de fitato nos grãos está correlacionado com o suprimento de fósforo à planta, porém não se sabe quanto este teor responde à disponibilidade mais lenta do nutriente no solo. O objetivo deste trabalho foi avaliar o efeito do pó de rocha, isolado ou combinado com esterco bovino, sobre: produtividade, teores de proteína, fósforo e fitato nos grãos de feijão. O experimento foi conduzido sob delineamento inteiramente casualizado, com quatro repetições. Em todas as parcelas, exceção ao tratamento com adubação convencional, foram adicionados pó de granito e fosfato natural. Os tratamentos foram constituídos de testemunha, adubação convencional, pó de basalto (2,5; 5,0; 10,0 e 20,0 t ha -1 ), esterco bovino e as mesmas doses de pó de basalto associadas com esterco bovino. No tratamento com adubação convencional, o teor de fósforo total no grão foi superior a testemunha. A ampliação das doses de pó de basalto proporcionou aumento no teor de fósforo nos grãos, mas o teor de fitato se manteve constante. O pó de basalto demonstrou ser uma alternativa para se manter níveis baixos de fósforo na forma de fitato nos grãos.Palavras-chave: antinutriente, pó de rocha, fósforo.ABSTRACT. Seed phytate and protein content in beans depending on the application of basalt powder. The content of phytate in the grains is correlated with the supply of phosphorus to the plant, but there is a lack of knowledge as to possible effect of slower availability of nutrients in the soil. The objectives of this study were to assess the effect of rock powder, alone or combined with cattle manure, on the productivity, levels of phosphorus, protein and phytate content in beans. The experiment was carried out in a randomized blocks design, with four replications. The treatments were control (limestone, granite and natural phosphate); conventional fertilization; powder basalt (2.5, 5.0, 10.0 and 20.0 ton. ha -1 ); cattle manure, and doses of powder basalt with cattle manure. In the treatment with conventional fertilizer, the total phosphorus content in grain was higher than the control, but the application of powder of basalt did not show a difference significant. Increase in the doses of basalt powder increased the phosphorus content, but phytate content remained constant. Basalt powder proved to be an alternative to maintain low levels of phosphorus in the form of phytate in the grains.
2 Vinasse is a liquid residue applied as a fertilizer in sugarcane crops. However, in areas far away from sugarcane mills the cost of the distribution can be very high due, the large volume of water. So, one solution is to concentrate the vinasse by the evaporation process to reduce transport costs. Considering that the nitrogen mineralization kinetics is not known in concentrated vinasse, the objective of this study was to evaluate the net and potential nitrogen mineralization in soil that received vinasse concentrated and not concentrated. The treatments with concentrated vinasse provided the highest values of net mineralization and total nitrogen, which presented significant correlation each other, the same way as the potential mineralization values had a positive correlation with the doses and the amounts of total nitrogen. The total nitrogen values can be used as an index of nitrogen availability in soils that received concentrated vinasse.
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