Forms of phosphorus in an oxisol under different soil tillage systems and cover plants in rotation with maize

Revista Brasileira de Ciência do Solo

Arminda Moreira De Carvalho²  Mercedes Maria Da Cunha Bustamante¹  Zayra Azeredo Do Prado Almondes¹  Cícero Célio De Figueiredo¹ 

[1] ,Embrapa CerradosPlanaltina DF ,Brazil

关键词: organic matter;    available phosphorus;    phosphorus sequential fractionation;    organic phosphorus;    inorganic phosphorus;    matéria orgânica;    fósforo disponível;    fracionamento sequencial de fósforo;    fósforo orgânico;    fósforo inorgânico;   

DOI  :  10.1590/S0100-06832014000300029

来源: SciELO

【 摘 要 】

Phosphorus fractions play a key role in sustaining the productivity of acid-savanna Oxisols and are influenced by tillage practices. The aim of this study was to quantify different P forms in an Oxisol (Latossolo Vermelho-Amarelo) from the central savanna region of Brazil under management systems with cover crops in maize rotation. Three cover crops (Canavalia brasiliensis, Cajanus cajan (L.), and Raphanus sativus L.) were investigated in maize rotation systems. These cover crops were compared to spontaneous vegetation. The inorganic forms NaHCO3-iP and NaOH-iP represented more than half of the total P in the samples collected at the depth of 5-10 cm during the rainy season when the maize was grown. The concentration of inorganic P of greater availability (NaHCO3-iP and NaOH-iP) was higher in the soil under no-tillage at the depth of 5-10 cm during the rainy season. Concentrations of organic P were higher during the dry season, when the cover crops were grown. At the dry season, organic P constituted 70 % of the labile P in the soil planted to C. cajan under no-tillage. The cover crops were able to maintain larger fractions of P available to the maize, resulting in reduced P losses to the unavailable pools, mainly in no-tillage systems.

【 授权许可】

CC BY   
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