ABSTRACT Paddy rice production based on traditional soil management emits large amounts of methane (CH4) into the atmosphere. This study assessed the potential of no-tillage (NT) and winter cover crops (WCC) to mitigate net greenhouse gas (GHG) emissions in a subtropical paddy rice ecosystem. A long-term (20-yrs) experiment was evaluated regarding the effect of NT combined with winter fallow or three WCC (ryegrass, white oat, and birdsfoot trefoil) on seasonal CH4 -C and nitrous oxide (N2O-N) emissions and on soil […]

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 […]

Soybean can be a viable alternative crop for lowlands. However, soybean relies on biological nitrogen fixation, a process that is normally affected by soil flooding, depending on the macrosymbiont genotype. Moreover, the behavior of different bradyrhizobia strains in flooded soil is yet unknown. The present research aimed to evaluate the efficiency of Bradyrhizobium elkanii and Bradyrhizobium japonicum strains recommended for soybean in comparison to mineral nitrogen fertilization, in flooded soil. The experiment was carried out in a greenhouse, where soybean […]

The nutritional limitations of an organic soil supporting a lowland rice crop, cv. Inca, were identified in a greenhouse experiment in Lavras, State of Minas Gerais, from December, 1994, to June, 1995. Soil samples were collected in Northern Fluminense region. Treatments consisted of control (natural soil), complete (N, P, K, limestone, S, B, Co, Cu, Mo, and Zn) and complete lacking one of these nutrients at a time. At the grain maturation time, the treatments lacking N and K showed […]