IMPACT4SOIL OpenAire Bielefeld Academic Search Engine (BASE) Crossref Microsoft Academic Graph Soil Research unspecified 2012-11-12 <p> The aim of this study was to assess the long-term changes in some key soil chemical properties at the completion of three long-term trials in south-eastern Australia and the relationship between those soil properties. From a soil organic matter perspective, the build-up of carbon (%C) requires an accumulation of nitrogen (%N), and the build-up of %C and %N fertility comes at the cost of soil acidity. Rotation, tillage, and stubble practices combine to alter the quantity, quality (C￢ﾀﾉ:￢ﾀﾉN), and the depth distribution of organic matter in a soil, but the three soil chemical properties reported here seem to also be in quasi-equilibrium at the three long-term sites. The consequence is that if the build-up of soil organic matter leads to soil acidification, then the maintenance of agricultural production will require liming. The emission of CO2 when limestone reacts with soil acids, plus the C cost of limestone application, will negate a proportion of the gains from C sequestration as organic matter in soil. Such cautionary information was doubtless unforeseen when these three long-term trials were initiated. </p> 2. Zero hunger 0401 agriculture, forestry, and fisheries soil acidification 04 agricultural and veterinary sciences 15. Life on land 630 organic matter Conyers, Mark, Newton, Philip, Condon, Jason, Poile, Graeme, Mele, Pauline, Ash, Gavin, 2012-01-01 journalpaper <p> The aim of this study was to assess the long-term changes in some key soil chemical properties at the completion of three long-term trials in south-eastern Australia and the relationship between those soil properties. From a soil organic matter perspective, the build-up of carbon (%C) requires an accumulation of nitrogen (%N), and the build-up of %C and %N fertility comes at the cost of soil acidity. Rotation, tillage, and stubble practices combine to alter the quantity, quality (C￢ﾀﾉ:￢ﾀﾉN), and the depth distribution of organic matter in a soil, but the three soil chemical properties reported here seem to also be in quasi-equilibrium at the three long-term sites. The consequence is that if the build-up of soil organic matter leads to soil acidification, then the maintenance of agricultural production will require liming. The emission of CO2 when limestone reacts with soil acids, plus the C cost of limestone application, will negate a proportion of the gains from C sequestration as organic matter in soil. Such cautionary information was doubtless unforeseen when these three long-term trials were initiated. </p> Three Long-Term Trials End With A Quasi-Equilibrium Between Soil C, N, And Ph: An Implication For C Sequestration 10.1071/sr12185 https://doi.org/10.1071/sr12185