Data/hora: 12/06/2024 13:22:42

Provedor de dados: | 65
País: | Brazil
Título: | Phosphorus fractions in soil after successive crops of Pinus taeda L. without fertilization
Autores: | Gatiboni,Luciano Colpo; Vargas,Cristiane Ottes; Albuquerque,Jackson Adriano; Almeida,Jaime Antonio; Stahl,James; Chaves,Djalma Miller; Brunetto,Gustavo; Dall’Orsoletta,Daniel João; Rauber,Luiz Paulo.
Data: | 2017-01-01
Ano: | 2017
Palavras-chave: | Forest rotations; Successive crops; Phosphorus fractionation; Labile phosphorus.
Resumo: | ABSTRACT: Pinus cultivation without fertilization is a common practice in southern Brazil, which can induce a decline in the availability of phosphorus (P) in the soil. The purpose of this study was to evaluate the changes in phosphorus fractions in a Humic Cambisol subjected to continuous Pinus taeda L. cultivation without fertilization. Two forest stands were evaluated, after 16 years of Pinus cultivation (1st crop) and 49 years (3rd crop), when soil samples were collected (layers 0-10, 10-20, 20-40, 40-60, and 60-80cm) from six trenches per forest. In soil samples, the P contained in organic (Po) and inorganic (Pi) forms was determined by sequential chemical fractionation. Labile inorganic P fractions remained unchanged after the different cultivation periods. However, the labile organic fractions declined from the first to the third cycle (from 70.6 to 39.8mg dm-3 in the 0-10cm layer), indicating that these forms influence the buffering capacity of labile Pi. The moderately labile organic P acted as a P drain, increasing its percentage of the total, from 34.7 to 56.3%, from the first to the third crop. Soil cultivation for 49 years with Pinus taeda resulted in a reduction of the organic P content, indicating that for this soil use, this P form should be used to diagnose P availability and fertilization requirements.
Tipo: | Info:eu-repo/semantics/article
Idioma: | Inglês
Identificador: | http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-84782017000700302
Editor: | Universidade Federal de Santa Maria
Relação: | 10.1590/0103-8478cr20160595
Formato: | text/html
Fonte: | Ciência Rural  v.47 n.7 2017
Fonte: | info:eu-repo/semantics/openAccess