Now showing items 1-10 of 11
Interpreting potential plant availabitily of N based on soil supply indicies
Soil supply of nitrogen is the most intensively studied of all nutrient cycles. Prior to the widespread use of fertilizers, economically viable agriculture was dependent solely on the soils ability to supply N. From 1945 ...
Assessing soil K supply capacity for wheat growth
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 ...
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 ...
Soil organic matter content and nutrient turnover in thin Black Oxbow soils after intensive conservation management
Cultivation and frequent fallowing has a significant impact on soil organic matter (SOM) concentration and soil bulk density. Conservation tillage systems, such as direct seeding, minimize mixing and disturbance of the ...
Are barley yields on eroded calcareous soils restricted by low zinc supply?
Calcareous knolls are often relatively unproductive locations in a field landscape. This may be attributed to lack of moisture as well as limited nutrient supplies. A growth chamber study was initiated to investigate the ...
Developing simplified synergistic relationships to model topsoil erosion and crop yield
Topsoil is highly enriched with organic matter, which provides a valuable source of plant nutrients as well as a favorable rooting environment. Over time, erosion processes selectively remove the organic matter-rich fine ...
Simulated Productivity Lost by Erosion (SimPLE): model development, validation, and use
Productivity lost due to soil erosion can be estimated by existing computer simulation models such as EPIC, NTRM and CENTURY. However, these models require extensive input data and, to date, have had limited success in ...