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- Title
Available Nitrogen and Responses to Nitrogen Fertilizer in Brazilian Eucalypt Plantations on Soils of Contrasting Texture.
- Authors
Pulito, Ana Paula; De Moraes Gonçalves, José Leonardo; Smethurst, Philip J.; Arthur Junior, José Carlos; Alvares, Clayton Alcarde; Tertulino Rocha, José Henrique; Hübner, Ayeska; De Moraes, Luiz Fabiano; Miranda, Aline Cristina; Kamogawa, Marcos Yassuo; Gava, José Luiz; Chaves, Raul; Silva, Claudio Roberto
- Abstract
Eucalyptus plantations have seldom responded to N fertilization in tropical and subtropical regions of Brazil. This implies that rates of N mineralization have been adequate to supply tree needs. However, subsequent crop rotations with low N fertilization may result in declining concentrations of organic and potentially mineralizable N (N0), and consequent loss of wood productivity. This study investigated (a) in situ N mineralization and N0 in soils of eucalypt plantations in São Paulo state, Brazil; (b) tree growth responses to N fertilizer applied 6-18 months after planting; and (c) the relationships between N0, other soil attributes and tree growth. We established eleven N fertilizer trials (maximum 240 kg ha-1 of N) in E. grandis and E. grandis x urophylla plantations. The soil types at most sites were Oxisols and Quartzipsamments, with a range of organic matter (18 to 55 g kg-1) and clay contents (8% to 67%) in the 0-20 cm layer. Concentrations of N0 were measured using anaerobic incubation on soil samples collected every three months (different seasons). The samples collected in spring and summer had N0 140-400 kg ha-1 (10%-19% total soil N), which were best correlated with soil texture and organic matter content. Rates of in situ net N mineralization (0-20 cm) ranged from 100 to 200 kg ha-1 year-1 and were not correlated with clay, total N, or N0. These high N mineralization rates resulted in a low response to N fertilizer application during the early ages of stand growth, which were highest on sandy soils. At the end of the crop rotation, the response to N fertilizer was negligible and non-significant at all sites.
- Subjects
BRAZIL; NITROGEN fertilizers; PLANTATIONS; CROP rotation; SOIL texture; OXISOLS; ARABLE land
- Publication
Forests (19994907), 2015, Vol 6, Issue 4, p973
- ISSN
1999-4907
- Publication type
Article
- DOI
10.3390/f6040973