African Journal of
Agricultural Research

  • Abbreviation: Afr. J. Agric. Res.
  • Language: English
  • ISSN: 1991-637X
  • DOI: 10.5897/AJAR
  • Start Year: 2006
  • Published Articles: 6691

Full Length Research Paper

Yield, nutrient uptake and potassium use efficiency in rice fertilized with crushed rocks

Douglas Ramos Guelfi Silva
  • Douglas Ramos Guelfi Silva
  • Departamento de Ciência do Solo, Universidade Federal de Lavras, Campus Universitário, Lavras, MG, CEP: 37200-000, Caixa-Postal: 3037, Brasil
  • Google Scholar
Carlos Roberto Spehar
  • Carlos Roberto Spehar
  • Faculdade de Agronomia e Medicina Veterinária, Universidade de Brasília, UNB, Campus Darcy Ribeiro, Brasília, DF, CEP: 70910-970, Brasil.
  • Google Scholar
Giuliano Marchi
  • Giuliano Marchi
  • Empresa Brasileira de Agropecuária, Embrapa Cerrados, Planaltina, DF, CEP: 73310-970, Brasil.
  • Google Scholar
Danilo de Araújo Soares
  • Danilo de Araújo Soares
  • Departamento de Ciência do Solo, Universidade Federal de Lavras, Campus Universitário, Lavras, MG, CEP: 37200-000, Caixa-Postal: 3037, Brasil
  • Google Scholar
Eduardo Lopes Cancellier
  • Eduardo Lopes Cancellier
  • Departamento de Ciência do Solo, Universidade Federal de Lavras, Campus Universitário, Lavras, MG, CEP: 37200-000, Caixa-Postal: 3037, Brasil
  • Google Scholar
Éder de Souza Martins
  • Éder de Souza Martins
  • Empresa Brasileira de Agropecuária, Embrapa Cerrados, Universidade Federal de Lavras, Campus Universitário, Lavras, MG, CEP: 37200-000, Caixa-Postal: 3037, Brasil.
  • Google Scholar


  •  Received: 11 July 2013
  •  Accepted: 18 December 2013
  •  Published: 16 January 2014

Abstract

The increasing world population has led into big food and raw material demand, with high pressure on agriculture. In Brazil, potassium fertilizers are mostly imported rising interest on rocks and mining rejects as alternative sources. The objective of this work was to evaluate the effect of crushed rocks over mineral nutrition, yield and efficiency of potash fertilization in rice. The experiment was carried out under greenhouse conditions in pots with 3.7 kg of Oxisol soil samples. The experimental design was completely randomized, in a factorial layout 4 × 6, comprising six crushed rocks used as alternative multinutrient fertilizer (breccia, biotite schist, ultramafic, Chapada byproduct, mining byproduct and phlogopite), and four doses based on potassium (0, 200, 400, 600 kg K2O ha-1), with four replications. The concentration and accumulation of potassium, copper, zinc and nickel in rice shoot dry mass were determined. These data were used to evaluate the efficiency index of K-source rocks on fertilization. It was shown that crushed rocks promote alterations in mineral nutrition, grain yield and potassium use efficiency, remarking their potential to be used as alternative fertilizer in rice cropping systems.

 

Key words: Alternative nutrient source, micronutrient, fertilization efficiency, plant nutrition, soil conditioner.