Effect of urea and polymer-coated urea on N content of soil and leaves of maize cultivated in Brazilian Cerrado

Autor(es)

Kaneko, Flavio Hiroshi ^[1] ; Ferreira, Joao Paulo ^[2] ; Freitas Leal, Aguinaldo Jose ^[1] ; Castello Branco van Cleef, Eric Haydt ^[1] ; Galati, Vanessa Cury ^[1] ; Arf, Orivaldo ^[3]

Afiliação do(s) autor(es)

^[1] Fed Univ Triangulo Mineiro UFTM, BR-38280000 Iturama, MG - Brazil

^[2] Univ Ctr Padre Albino UNIFIPA, BR-15809444 Catanduva, SP - Brazil

^[3] Sao Paulo State Univ UNESP, BR-15385000 Ilha Solteira, SP - Brazil

• Tipo de documento: Artigo Científico
• Fonte: SOIL & TILLAGE RESEARCH; v. 209, MAY 2021.
• Citações Web of Science: 0

Resumo

The development of technologies that provide rational and sustainable use of nitrogen fertilizers is among the priorities of agronomic research in 21st century. Therefore, the objective of this study was to evaluate the effects of conventional urea or polymer-coated urea (PCU) on soil mineral nitrogen (N) content, plant dry mass and leaf N content in maize (Zea mays L.), cultivated in two seasons (first and second-crop) and in two regions of the Brazilian Cerrado (Chapadao do Sul-MS and Selvria - MS). The treatments consisted of the combination of two sources of N (conventional urea or polymer-coated urea) and five doses of N (0, 45, 90, 135 or 180 kg ha(-1)), in a randomized complete block design, with a 2 x 5 factorial scheme with four replications. The following parameters were evaluated: soil mineral N content (NH4+, NO3- and total mineral N), plant dry mass and leaf N content. Although the PCU did not change the NH4+, NO3- and total mineral N content in the soil, nor the dry mass of the plants, it provided, on average, higher N content in the leaves, when compared to CU. The increasing rates of N linearly increased the levels of NH4+, NO3- and total mineral N content in the soil, as well as the dry mass of the plants and the N content in the leaves, regardless of N source or study location. (AU)

• Processo FAPESP: 11/00315-6 - Inoculação com Azospirillum brasilense, fontes e doses de nitrogênio na cultura do milho em duas épocas de semeadura
• Beneficiário: Flávio Hiroshi Kaneko
• Modalidade de apoio: Bolsas no Brasil - Doutorado