ABSTRACT Given the increase in crop yields and the expansion of agriculture in low fertility soils, deficiency of micronutrients, such as iron, in plants grown in tropical soils has been observed. The aim of this study was to evaluate Fe availability and Fe uptake by corn (Zea mays L.) plants in 13 different soils, at two depths. Iron was extracted by Mehlich-1, Mehlich-3, and CaCl2 (Fe-CC) and was fractionated in forms related to low (Feo) and high (Fed) crystallinity pedogenic […]

Four experiments were conducted simultaneously in a Alluvial Soil, a Low-Humic Gley, a Humic Gley and an artificially drained bog soil with the objective of evaluating the influence of liming and manure applied in previous bean crop on residual effects of phosphorus fertilization, extractor efficiency and acid phosphatase activity in aired soils before flooding in the prediction of P availability to rice cultivated after flooding. After the bean harvest, replicates of each treatment for each soil were mixed and 3.2 kg […]