Influence of liming on the spatial and temporal variability of Mehlich-1 extractable Fe in a rice field

Abstract:

The spatial variability and temporal stability of Fe extracted by Mehlich-1 was investigated on an acid rice soil, a typic Plintacualf, under different lime doses and redox potential (Eh) conditions in Corrientes, Argentina. Soil was sampled firstly in aerobic conditions, before sowing and then twice more in anaerobic conditions, i.e. 4 and 8weeks after flooding. Three liming treatments were imposed: control (without any lime addition) and two dolomite doses (625 and 1250kgha−1). Ninety-six samples were taken for each sampling period and dolomite treatment. Flooding caused a decrease in Eh and an increase in pH. Increasing dolomite dose produced pH increase, while it enhanced Eh decrease, both in aerobic and in anaerobic conditions. Mehlich-1 extractable Fe was 4 to 12 times higher 8weeks after flooding than in aerobic conditions. Increasing dolomite amendment slightly decreased Mehlich-1 extractable Fe in …

Año de publicación:

2011

Keywords:

Fuente:

google