Profitability and efficiency of fertilization in a corn/ soybean/corn system in a Latosol with improved fertility

Clério Hickmann, Álvaro Vilela de Resende, Carlos Alberto Silva, Julian Junio de Jesus Lacerda, Silvino Guimarães Moreira, Otávio Prates Conceição

Resumo


Currently, there are some doubts regarding fertilization dimensioning that aims at a high grain yield in soils with improved fertility in a crop rotation system. Thus, the objective of this study was to evaluate the yield and profitability resulting from different combinations of NPK fertilization and
the efficiency of these nutrients in sequential crops of corn/soybean/corn, in a Latosol with improved fertility, in a farm located in the region of Campo das Vertentes, Minas Gerais State, Brazil. Four doses of sowing fertilization and topdressing were compared, corresponding to approximate proportions of 25, 50, 100 and 150 % of the doses usually applied by farmers. Nutrients sources varied according to the inputs used in the farm for each crop. In a soil with improved fertility, corn is more responsive to
fertilization than soybean, with higher grain yield gains associated with N and K supply, while P is less limiting. The most profitable nutrients combination for this system involves increasing the amounts of N and K and reducing the amount of P in relation to the standard fertilization employed on the farm, providing a 14.3 % higher profit and higher average nutrient use efficiency.


Palavras-chave


Fertilizer use efficiency. Crop rotation. High grain yield. High-investment agriculture.

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DOI: http://dx.doi.org/10.18406/2316-1817v9n420171037

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Direitos autorais 2018 Revista Agrogeoambiental

Rev. Agrogeoambiental, Pouso Alegre, MG, Brasil. e-ISSN: 2316-1817

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