Now showing items 1-10 of 222
Determination of heavy metal contamination in the soil environment using ion-exchange membranes
An anion exchange resin membrane saturated with chelating agent (AEM-DTPA) was used to assess the bioavailability of four heavy metals, Cd, Cr Ni and Pb via direct in soil burial. Two soils with four contamination rates ...
Assessing nutrient availability variations in landscapes
A simple method was developed to assess the variability in nutrient availability in undulating landscapes using anion-exchange resin strip burial. Resin strips were buried in ten farm fields along transects at points in ...
Assessing soil K supply capacity for wheat growth
Chemical changes in cereal straw under two fallow systems and its relationship to nutrient availability
In recent years, conventional mechanical fallow has been partly replaced by herbicide-fallow on the prairies. With the chemical system of weed control, the straw is not mixed with the soil until seeding the following spring; ...
Determination of 2,4-d amine in soils using anion-exchange membranes
A new method for the quantitative determination of 2,4-D in soils by use of anion-exchange membranes with GC detection was developed. Preliminary investigation of ion-exchange properties of pure 2,4-D acid on the membranes ...
Characterizing soil phosphorus supply on aggrading and degrading management regimes
Practical concerns regarding P fertility usually focus on crop maturity and quality. However, on highly degraded soils P supply can be so low as to limit grain yield. A study of soils treated with conservation and conventional ...
Ion-exchange resin strips as plant root simulators
Ion-exchange resin strips have the potential to closely mimic the manner in which a plant root removes nutrient ions from the surrounding soil. A method was developed involving burial of resin strips in soil; followed by ...
Assessment of elemental S-sludge mixtures and waste gypsum as fertilizer sources
Two separate studies (soil incubation and growth chamber) were used to assess the release of plant available sulfate from two alternative sulfur sources: (1) combinations of finely ground elemental sulfur, dried digested ...
Chemical changes in standing cereal straw residues in chemfallow and its relationship to N, P, and S availability in two cropping systems
In recent years, conventional mechanical fallow has slowly shifted to chem-fallow on the prairies. With the chemical system of weed control, the straw is not mixed with the soil until seeding the following spring; meanwhile ...
Salinity and salt contamination assessment using anion-exchange resin membranes
Exchange resins have the ability to sorb ions directly from the soil solution and, thereby show promise as a method to assess plant available nutrients. In salt affected soils, knowing the relative levels of various anions ...