Abstract
The objective of this work was to evaluate the influence of different doses of spent coffee grounds on soil microorganisms responsible for nutrient cycling and the development of corn crop under no-tillage. The trial was conducted in a field at the State Center for Agricultural Professional Education Fernando Costa, in a randomized block with 4 treatments, with increasing doses, 0, 3, 6 and 9 t ha-1 of coffee grounds. Microbial biomass carbon (CBM), baseline respiration (RBS), microbial and metabolic quotient (qMIC and qCO2), plant development (corn) and productivity were evaluated. At the dose of 9 t ha-1 of spent coffee grounds, there was an increase in organic matter and microbial biomass (219.01) and qMIC (1.5). With increased microbial activity, the development of the plant was 20% higher compared to the control, plant height (2.21) and stem diameter (2.99). Consequently, the productivity was 42 bags ha-1 higher than the control. Thus, we can conclude that spent coffee grounds can be a viable alternative for use as organic fertilizer in agriculture.
Highlights
IntroductionOriginating in Central America, it is cultivated in practically all regions due to its high productive potential, chemical composition and nutritional value, assuming the position of the most produced cereal in the world (Lopes et al, 2020)
Corn (Zea mays L.) has great economic importance in the world
The application of spent coffee grounds to 9 t ha-1 of corn crop showed an significant increase in organic matter in the soil and in the microbial population (SMBC) and qMIC compared to the other treatments (Table 3)
Summary
Originating in Central America, it is cultivated in practically all regions due to its high productive potential, chemical composition and nutritional value, assuming the position of the most produced cereal in the world (Lopes et al, 2020). Concerns have risen to create alternatives and appropriate technologies to reduce these impacts (Cavalcante et al, 2019). Among these alternative, technologies the use of organic residues as biological fertilizer has been proposed due to the high concentration of important nutrients for the development of the plant and its high content of organic matter, important in the biological activity of the soil (Kumar & Kumar, 2017)
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