Soil Organic Matter Fractions and Enzymes Activities under No-tillage System: Effects of Organomineral and Mineral Fertilizer with Humic Substances

ABSTRACT

The use of organomineral fertilizer can promote increments of organic matter and affect the enzymatic activity of the soil. The objective of this research was to evaluate the effect of organomineral and mineral fertilizer with humic substances on soil organic matter fractions and enzymes activities. The study was set up in a Xanthic Ferrasol, in the Cerrado region, Brazil. Treatments consisted of two fertilizers and four rates of P fertilizer. The following fertilizers were studied: mineral fertilizer enriched with humic substances (03% of N, 25% of P₂O₅, 08% of K₂O, with 1% humic substance); and granulated organomineral produced from poultry litter and mineral fertilizer (MAP – mono-ammonium phosphate, with 26.6% of P₂O₅ and 18.2% of organic carbon). Five rates of P were also evaluated (0, 20, 40, 60, and 80 kg ha⁻¹ of P₂O₅). The crop production, soil organic matter fraction and enzymes were assessed in the 2014/2015 and 2015/2016 growing seasons. Contents of the total organic carbon, particulate organic carbon, humic acid, fulvic acid, and maize and soybean grain yield were positively influenced by the fertilizer application. Fertilization treatments did not affect the enzymes activities, but they showed positive correlations with particulate organic carbon.

KEYWORDS:

• Humic acid
• phosphatase
• Glycine max
• Zea mays

Acknowledgments

• The authors are grateful to the Coordenação de Aperfeiçoamento de Pessoal de Nível Superior - Brasil (CAPES) - Finance Code 001, The Empresa Brasileira de Pesquisa Agropecuária - Brasil (Embrapa) in fuction of the project of technological bases for the development of organomineral fertilizers in Brazil, and the Universidade Federal de Mato Grosso do Sul – UFMS/MEC – Brazil.

Disclosure statement

No potential conflict of interest was reported by the author(s).

Correction Statement

This article has been republished with minor changes. These changes do not impact the academic content of the article.