ABSTRACT Soil acidity is one of the main factors that reduces productivity in agricultural crops, and it is corrected with materials that neutralize acidification. Among soils affected by acidity are those of volcanic origin. At least 30 % of agricultural soils in Chile are of volcanic origin, and acidity correction practices must be constantly performed. This study aimed to evaluate the effectively of two materials that may neutralize soil acidification and increase yield production in Chilean volcanic soils. An experiment […]

The production and storage of construction and demolition residues (CDR) consist in an important environmental issue because they represent more than 50 % of total solid waste that has been produced in large and medium-sized urban centers. However, as limestone is one of the major raw materials used in cement and hydrated lime products in the preparation of concrete and mortar, recycling this material can, in principle, provide a subproduct with potential to be applied to correct soil acidity. This […]

Fertilizers and lime can carry several micronutrients as residual impurities, which can become a source of these elements for crops. This study quantified the concentrations of Zn, Cu, Fe, Mn, and Ni in fertilizers and lime sold in northeastern Brazil. The effect of these inputs on the indirect micronutrient supply to crops was evaluated. Extracts were obtained from 24 fertilizer and 26 lime samples, using the method 3051A (USEPA) and atomic absorption spectrophotometry for elemental analysis. A fertilizer sample (SRM […]

In Brazil extensive areas are covered with pine forests, planted for pulp and paper production. This industry generates solid alkaline waste, such as dregs. The application of this dregs to forest soils is an alternative for soil acidity correction and plant nutrient supply, as well as a solution for its proper disposal. The purpose of this study was to compare the residual effect of surface application of dregs and dolomitic lime on (a) changes in the physical and chemical properties […]

Continuous agricultural production in the Amazon region requires correction of soil acidity and understanding of the long-term interactions of liming with chemical soil properties. The objective of this study was to evaluate the immediate and residual effects of lime on annual crop production and soil properties of medium-textured Oxisols in the Brazilian Amazon. Field experiments were conducted at two locations in the Northeast of Pará from 2003 to 2008, one in the county of Terra Alta and the other in […]

Especially under no-tillage, subsuface soil acidity has been a problem, because it depends on base leaching, which has been associated with the presence of low molecular weigth organic acids and companion anions. The objective of this study was to evaluate exchangeable base cation leaching as affected by surface liming along with annual urea side-dressing of maize and upland rice. Treatments consisted of four lime rates (0, 1500, 3000, and 6000 kg ha-1) combined with four nitrogen rates (0, 50, 100, […]

The application of gypsum can make Al unavailable to plants and provide soil nutrients, improving conditions for high crop yields. This study evaluated the chemical characteristics of Red Latosol, with or without exchangeable Al as influenced by gypsum rates (0, 1000, 2000, 3000, 4000, and 5000 kg ha-1) applied to the soil surface, and the effect of gypsum on mineral nutrition and wheat and soybean yields under no-tillage. Gypsum was applied to the surface six months after liming. Six and […]

In Rio Grande do Sul State (RS), Southern Brazil, aluminum saturation in many areas under no-till system is high and base saturation low in the 0.10-0.20 m layer (subsurface), which may reduce the grain yield of annual crops. The objective of this study was to evaluate if the occurrence of high aluminum saturation and low base saturation in the subsurface, under a no-till system, represents a restrictive environment for crop production, as well as to evaluate forms of lime incorporation […]

The water-soluble organic compounds of plant residues released on the soil surface can improve the subsoil fertility, due to the neutralization of acidity and Ca and Mg transport. An experiment was conducted at the Instituto Agronomico do Parana (IAPAR), Londrina, to evaluate the effect of water-soluble organic compounds of plant extracts on the chemical characteristics of a dark Red Latosol (Typic Haplortox), on soil samples in columns. The treatments consisted of: distilled water, lime incorporated in the 0-5 cm soil […]

Soil acidity is one of the most important constraints to agricultural production in the tropics. For this reason, the objective of this research was to evaluate the effects of soil liming on the performance of guava (Psidium guajava L.) trees. The experiment took place at the Citrus Experimental Station in Bebedouro, state of São Paulo, Brazil. The soil was a Typic Haplustox (V = 26 % in the 0 to 20 cm layer) between August 1999 and July 2006. The following doses of limestone were […]