Soil Science Society of America Journal · 2007
Changes in Soil pH, Organic Carbon, and Extractable Aluminum from Crop Rotation and Tillage
Godsey, C. B., Pierzynski, G. M., Mengel, D. B., Lamond, R. E.
Export
Changes in Soil pH, Organic Carbon, and Extractable Aluminum…
Abstract
Recent attention has focused on management of soil acidity in no‐till (NT) soils due to the limited movement of surface‐applied lime in these systems. Interactions of exchangeable Al and organic matter have been recognized for many years, but limited data exist investigating how these interactions should affect management decisions for NT soils. This study was conducted to identify effects of rotation and tillage on soil pH and soil organic carbon (OC) content and to determine the influence of soil pH and OC on KCl and CuCl 2 extractable‐Al (Al KCl and Al CuCl2 , respectively). Soil samples were collected to a depth of 15 cm, in 2.5‐cm increments, from a long‐term rotation and tillage study near Manhattan, KS. Soil pH and OC concentrations were influenced by rotation and tillage, especially in the surface 2.5 cm. Organic C concentrations were on average 2.3 g kg −1 greater with NT than with conventional tillage in the surface 15 cm of soil. Aluminum extracted with KCl and Al CuCl2 increased exponentially with decreasing soil pH. Copper chloride extractable‐Al values were on average 8% greater than Al KCl values. When using a regression model to predict the difference between Al CuCl2 and Al KCl , inclusion of OC explained only 4% more variability compared with inclusion of only soil pH in the model. A change in OC concentrations of 2.3 g kg −1 , as observed in this study, after reducing tillage would likely not alleviate Al toxicity if pH became very acidic (pH < 5).
Show all
Recent attention has focused on management of soil acidity in no‐till (NT) soils due to the limited movement of surface‐applied lime in these systems. Interactions of exchangeable Al and organic matter have been recognized for many years, but limited data exist investigating how these interactions should affect management decisions for NT soils. This study was conducted to identify effects of rotation and tillage on soil pH and soil organic carbon (OC) content and to determine the influence of soil pH and OC on KCl and CuCl 2 extractable‐Al (Al KCl and Al CuCl2 , respectively). Soil samples were collected to a depth of 15 cm, in 2.5‐cm increments, from a long‐term rotation and tillage study near Manhattan, KS. Soil pH and OC concentrations were influenced by rotation and tillage, especially in the surface 2.5 cm. Organic C concentrations were on average 2.3 g kg −1 greater with NT than with conventional tillage in the surface 15 cm of soil. Aluminum extracted with KCl and Al CuCl2 increased exponentially with decreasing soil pH. Copper chloride extractable‐Al values were on average 8% greater than Al KCl values. When using a regression model to predict the difference between Al CuCl2 and Al KCl , inclusion of OC explained only 4% more variability compared with inclusion of only soil pH in the model. A change in OC concentrations of 2.3 g kg −1 , as observed in this study, after reducing tillage would likely not alleviate Al toxicity if pH became very acidic (pH < 5).
Recent attention has focused on management of soil acidity in no‐till (NT) soils due to the limited movement of surface‐applied lime in these systems. Interactions of exchangeable Al and organic matter have been recognized for many years, but limited data exist investigating how these interactions should affect management decisions for NT soils. This study was conducted to identify effects of rotation and tillage on soil pH and soil organic carbon (OC) content and to determine the influence of soil pH and OC on KCl and CuCl 2 extractable‐Al (Al KCl and Al CuCl2 , respectively). Soil samples were collected to a depth of 15 cm, in 2.5‐cm increments, from a long‐term rotation and tillage study near Manhattan, KS. Soil pH and OC concentrations were influenced by rotation and tillage, especially in the surface 2.5 cm. Organic C concentrations were on average 2.3 g kg −1 greater with NT than with conventional tillage in the surface 15 cm of soil. Aluminum extracted with KCl and Al CuCl2 increased exponentially with decreasing soil pH. Copper chloride extractable‐Al values were on average 8% greater than Al KCl values. When using a regression model to predict the difference between Al CuCl2 and Al KCl , inclusion of OC explained only 4% more variability compared with inclusion of only soil pH in the model. A change in OC concentrations of 2.3 g kg −1 , as observed in this study, after reducing tillage would likely not alleviate Al toxicity if pH became very acidic (pH < 5).
Similar papers
Effects of conservation agriculture on physicochemical soil health in 20 maize‐based trials in different agro‐ecological regions across Mexico
Fonteyne et al. · 2021 · Land Degradation & Development
8 shared concepts
4 findings1 site
Lime movement through highly weathered soil profiles
Nunes et al. · 2019 · Environmental Research Communications
6 shared concepts
8 findings1 site
Modulation of the soil microbiome by long-term Ca-based soil amendments boosts soil organic carbon and physicochemical quality in a tropical no-till crop rotation system
Bossolani et al. · 2021 · Soil Biology and Biochemistry
7 shared concepts