Showing papers by "Eduardo Fávero Caires published in 2013"
TL;DR: In this paper, the effect of plant residues and biochar on soil S mineralization was investigated for 90 days using a laboratory incubation experiment and the results indicated that the forms of S in the starting materials seem to drive S mineralisation.
94 citations
TL;DR: In this article, the authors evaluated the performance of corn and soybeans on an acid loamy soil under a long-term no-till system, in response to surface liming and as affected by genotypic tolerance to Al and water stress.
Abstract: Field studies have demonstrated that aluminum (Al) toxicity is low in no-till systems during cropping seasons that have adequate and well-distributed rainfall. This study evaluated the performance of corn (Zea mays L.) and soybean (Glycine max L. Merrill) on an acid loamy soil under a long-term no-till system, in response to surface liming and as affected by genotypic tolerance to Al and water stress. A field trial examined the effect of surface application of lime (0, 4, 8, and 12 Mg ha−1) on no-till corn and soybean nutrition and yield. Trials were also carried out in undisturbed soil columns taken from the unlimed and limed plots. Two hybrids/cultivars of corn and soybean, one sensitive and the other moderately sensitive to Al were grown at two soil moisture levels with and without water stress (50 % and 80 % water filled pore space). Alleviating soil acidity by liming improved nutrition and increased grain yields of corn and soybean. The benefits of liming on root length density, nutrient uptake and shoot biomass production of corn and soybean were more pronounced in Al-sensitive genotypes under water stress. The results suggest that plants exposed to drought stress under no-till systems are more affected by Al toxicity.
62 citations
TL;DR: In this article, the long and medium-term effects of the application of up to 12 Mg ha -1 of phosphogypsum (PG) as soil conditioner and source of Ca and S, in two field trials, conducted under no-till systems.
Abstract: This study reports long- and medium-term effects of the application of up to 12 Mg ha -1 of phosphogypsum (PG) as soil conditioner and source of Ca and S, in two field trials, conducted under no-till systems. One field trial was located in Ponta Grossa, state of Parana (PR), Brazil, on a loamy Oxisol, which received lime and PG applications in 1993. Another area of study was located in Guarapuava (PR), on a clayey Oxisol,which received PG in 2005. After thirteen years of surface-applied lime on the loamy Oxisol, we observed soil acidity reduction up to 80 cm depth, while PG effects Ca 2+ and S-SO 4 2contents were more pronounced at deeper soil layers. Sulfate distribution in soil profiles was mostly correlated with Fe d and Fe d -Fe o . However, there was no long-term effect of lime and PG additions on no-till maize (Zea mays) and wheat (Triticum aestivum) yields. An appreciable movement of SO 4 2-S to the subsoil was observed in soil samples from the clayey Oxisol after surface-applied PG. This was observed even in the medium term (3.5 years) and despite the higher adsorption capacity of sulfate. In this case, PG addition had positive benefits on maize and triticale ( X Triticosecale) yields due to the supply of Ca 2+ and SO 4 -2 -S to the plants.
52 citations