Now showing items 21-30 of 116
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 ...
Phosphorus loading and environmental analysis in manured Saskatchewan soils
Phosphorus (P) is a key element in plant nutrition, but excessive amounts can accumulate in the soil if manure P application rates exceed crop uptake over time. Risk of potential P movement and contamination of surface ...
Effect of winter feeding systems on soil nutrients
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 ...
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 ...
Leaf analysis as a guide to sulfur fertilization of legumes
Tissue analysis is a diagnostic tool which can be used in identifying S deficiencies and predicting S fertilizer requirements of crops. A water extraction procedure for removal and measurement of inorganic sulfate in plant ...
Spring wheat response to zinc and copper applied to eroded soils
A response to added N and P was not observed in a growth chamber experiment using soils sampled from eroded knolls. Subsequent soil tests indicated very low levels of available copper and zinc in some of the soils. A second ...
Use of ion-exchange membranes in routine soil testing
We developed and assessed a method for simultaneous ·extraction of plant available nitrogen, phosphorus, sulfur, and potassium using anion- and cation-exchange membranes (ACEM). The technique was found to be highly suitable ...