The objectives of this were to investigate the response of Lupinus albus sp. to
phosphate rock (PR) as a source of phosphorus (P) nutrition, and to study the role organic
acid (Citric and Malic) in phosphorus dissolution from PR. Tow experiments we
re
conducted: 1) A greenhouse pot experiment, in order to study the response of white lupin
to the application of PR and Triple super phosphate TSP at three application rates (100-
450-800 ppm). 2)- A laboratory experiment in order to study the role of Citric and Malic
acids concentration and initial pH in P- release from PR. The results showed that Lupinus
albus sp. was able to use PR for P-nutrition, and has a relative agronomic effectiveness of
61% when compared to TSP. The possible Exuded organic acids such as Citric and Malic
were responsible for PR dissolution due to tow mechanisms: 64% of PR dissolution was
due to pH decrease in the rhizosphere area, and 34% due to chelating of calcium cations.
PR dissolution was increased by the increase organic acid concentration, but decreased
when the initial pH value increased. Dissolution was always more pronounced with citric
than malic acid.
The consequent dissolution of the state they were in before the contract, if it is impossible that jazz judgment for compensation, has been dealt with in our research that the role of monetary inflation in the impossibility of thus retroactivity to t
he dissolution of the contract, we show the impact of inflation on monetary impact under the dissolution of the contract, where we concluded that inflation, according, to a certain percentage, estimated the trial judge, being the cause of the impossibility of retroactivity to the dissolution of the contract, and the judge be assisted by experienced economic in this regard, if it is decided that he may rule for compensation, and latter may be be a response to the real value of the monetary commitment without a numerical value, and this is not a re probably compensation for contractors to pre- contract dissolved but compensation for the impossibility of retroactivity to the dissolution of the contract.
In this work, Ck85 carbon steel was subjected to cyclic heat
treatment.
Process that consisted of cyclic short-duration (3.4 minutes)
holding at 800 C (above Ac3 temperature) followed by forced air
cooling. After 8 cycles (about a total 1 hour du
ration of heating and cooling cyclic), the microstructure mostly contained fine ferrite
grains and spheroidzed cementite. This microstructure possessed
an excellent combination of strength and ductility. The disintegration of lamellar pearlite through dissolution of cementite
at boundaries lamellar during short-duration holding above Ac3
temperature, and the generation of lamellar defects during nonequilibrium forced air cooling were the main reasons of
accelerated spheroidization. The strength initially increased mainly
due to the presence of finer microconstituents (ferrite and pearlite)
and then marginally decreased with the elimination of lamellar
pearlite and appearance of spheroid cementite in the microstructure.
A pot experiment was conducted to evaluate the relative agronomic
effectiveness (RAE%) of a Syrian phosphate rock when it is added alone and as
mixture with elemental sulfur with three different ratios (PR:S) (2:1) (5:1) (8:1)
and compared with tr
iple superphosphate. The main results of this study
showed that Ain Layloun phosphate rock was not effective for direct use by
Rye grass when used alone, but it became effective when mixed with elemental
sulfur. The relative agronomic effectiveness was varied following mixing ratios,
it was 50%, 76% and 87% in (8:1), (5:1) and (2:1) (PR:S) mixing ratios
respectively. This is due to the increase of available soil phosphorus content
which is related to the increase of phosphate rock solubility due to decrease of
pH derived from oxidation of sulfur by Thiobacillus spp.
