The objective of this research was to express a fungal phytase gene in transgenic soybean cells to to study the potential for improving phosphorus utilization in soybean meal. A simple and inexpensive particle inflow gene gun was constructed and bombardment was optimized as assa…
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Although the main limitation of crop production in the arid and semiarid regions of Morocco is lack of sufficient rainfall, phosphorus (P) nutrient deficiencies also are major obstacle to maximum crop production. Fertilizer management is an important step in sustainability of cr…
Scope and methods of study. (1) Scale effects on phosphorus (P) loss and runoff depth from pastures were investigated by summarizing water quality data from 19 research projects. Spatial (area) and temporal (days after litter application) scales ranged from 0.5 to 80000 m2 and 1…
Experiments have been conducted on measuring the combined effects of (1) time after sludge application, (2) temperature of equilibration, and (3) soil properties (principally pH and texture) on P availability and chemical fractions. Plant-available P (measured by iron-oxide stri…
Paddy-soils in Java, Indonesia, have been intensively fertilized with phosphate for at least three decades through centralized government programs, which provide subsidized intensification packets to farmers. One side effect of these programs has been an excessive accumulation o…
Application of animal waste and biosolid to soil is a common practice and often builds soil phosphorus (P) levels in excess of crop needs, which is a concern for the deterioration of surface water quality. Manure amended treatment released more P but rate of release was slower t…
Optimization of phosphorus nutrition is a critical component of dryland cereal production. Soil moisture limits P uptake and wheat growth in aridic and xeric moisture regimes. Experiments were conducted to evaluate deep P placement and mycorrhizal inoculation as techniques for e…
Understanding how atoms interact is a fundamental aspect of chemistry, biology and materials science. There have been great advances in the knowledge of covalent and ionic bonding over the past twenty years but one of the major challenges for chemistry is to develop full underst…
A mesocosm experiment was carried out in a Norwegian fjord near Bergen in May 2006, with the main objective being the study of the effects of increasing concentrations of atmospheric CO2 (and associated effects such as increased acidification) on blooms of natural marine coastal…
The application of ICP-MS to the fields of proteomics and genomics has arisen in part due to its ability to detect and quantify trace levels of S and P, which are major constituents in proteins and nucleic acids respectively. The development of collision/reaction cell technology…
This thesis covers work carried out on algae bioreactors as a tertiary treatment process for wastewater treatment. The process was primarily assessed by the removal of Phosphorus and Nitrogen as an alternative to chemical and bacterial removal. Algal bioreactors would have the a…
Managed aquifer recharge (MAR) consists of artificially replenishing groundwater to facilitate reuse and/or the associated environmental benefits. Meanwhile, soil aquifer treatment (SAT) is a process of geo-purification designed and operated to improve the quality of the infiltr…
Little information is available on the early effects of manure P from poultry [both chicken (Gallus gallus domesticus) and turkey (Melleagris gollopavo)] on corn (Zea mays L.) production. This study assessed the effects of poultry manure application rates commonly used by Corn B…
Concerns about phosphorus (P) excretion into the environment from livestock and poultry in concentrated animal feeding operations (CAFOs) have made it necessary to examine alternative methods in which to reduce the amount of P that is excreted by the animal without impairing per…
Studies of broiler breeder diet modifications to reduce phosphorus (P) excretion have evaluated bird performance, but no studies have quantified the effects of P in the manure and the impacts to soil and plant availability once soil-applied. Four diets were formulated by factori…
The direct application of rock phosphate (RP) can be a good alternative to water-soluble P fertilizers. However, despite the extensive work done on RPs, there are no models to predict amounts of RP required. A study including both laboratory and field experiments was conducted t…
Cowpea (Vigna ungiculata L. Walp) is a major food and fodder legume in poor countries, particularly Sub-Saharan Africa countries. It is generally produced in sandy, acid soils, deficient in phosphorus (P) which severely limits its production. Because processed phosphate fertiliz…
Phosphorus (P) and zinc (Zn) deficiencies are common in calcareous soils. Calcareous soils make up some of the most productive agricultural lands in the Mandozai district of the Khost province in southeastern Afghanistan and little is known about the phosphorus and zinc fertilit…