This research is done in an experiment by plaster in the
circumstances of Homs. The aim of this paper to study the effect of
adding four different levels of phosphogypsum as much as (0.00,
6.72, 13.44, 20.16)ton / hectare (three replicates for eac
h treatment)
on bulk density and structure stability for clay soil has taken from
(Kattina).
The results showed improvement in the stability of the structure of
soil specially (0.25-1)mm, increasing in aggregation degree ,
increasing of the rate of total porosity ,air filled porosity in
comparison to the control at the two levels(13.44, 20.16)ton/hectare
and also by increasing the added level . Whereas the dispersion
ratio , and Bulk density were decreased when increasing the level
of phosphogypsum at the same two levels.
The main achieved results in this study showed , a significant
increase in aggregation degree in the soil when increasing the ratio
of the added phosphogypsum at the levels( 6.72, 13.44, 20.16) in
comparasion with control .
In other way the dispersion ratio was decreased and had negative
relationship when increasing the level of the added
phosphogypsum in comparasion with control .
This study was conducted at Darya and Abe Jerash regions to study some Physical properties of the two soil types such as: soil depth, soil texture, bulk density, Specific weight and Porosity. Results showed that Bulk density average decreased and the
total porosity increased in the soil of Darya compared to soil of Abe Jerash, due to the high percentage of clay in the first type compared to the second one. Bulk density average in general, increased in both soils with depth.
Presence of a strong and positive relationship between the Specific weight and the percentage of sand in the soil of Darya and it was
also strong but inverse in the soil of Abe Jerash, but the relationship was. The coefficient of determination was high for
silt with Specific weight in the soil of Darya, while this factor
was low in the soil of abe Jerash, indicating the high quality of the regression equation that represents the relationship between the two variables in soil of Darya.
The study has shown that the apparent bulk density of soil increases with the increase
of compression and moisture during press. The maximum rate of increase in depth was 0 –
20 cm that amounted 0.38g/cm3 at compression by 257.44-kilopascal and moi
sture
average at compression by 19.03% (equal to 60% of the field capacity average of the soil)
in comparison with the non-existence of compression. In addition, the size of the pores
bigger than 50 microns decreased at the same above compression and above moisture in
depth of zero – 20 cm by 20.20%. The size of pores bigger than 10 microns decreased by
20.65% in comparison with the non-existence of compression. While it was noted that the
the maximum loss of root yield that amounted 17.52%, at compression by 257.44
kilopascal, and moisture 19.03%.
In this search, has been studied set of practical experiences for compacting several
metal powders composed a metallic alloy based iron from powders with a proposed
geometric shapes (cylindrical). Several tests were done in order to reach the relat
ionship
between the final apparent density for the compact with a sintering time, and study
changing the geometric dimensions of the final compact after the completion of sintering
process during different time periods.
The tests and Measurement results had been demonstrated that sintering time affect
positively on the apparent density of the final compact which Manufactured by technique
metal powders, and thus will increase its strength, where proportionality is directly
proportional access even to a certain extent. And also its effect was an obvious shrinking
diameters samples used in the tests. And changing (increase or decrease) in height samples.
Search has shown the great importance of the follow-up studying and analyzing the
relationships which associate that variables of metal powders technique each other, and
their different effect on the final compact.
The effect of clay soil treatment with two levels of tobacco west compost and
organic fertilizer (15 and 30 ton/ h), in addition to mineral fertilizer treatment, with three
replicates of each treatment on some physical properties (Aggregate size di
stribution, main
weight diameter, bulk density and porosity) and chemical properties (Organic carbon,
humic and volvic acid and humification index for big and small soil aggregates was
studied.
The results showed that tobacco west compost and organic fertilizer were effective in
increment of soil content of organic carbon, which reached (20 and 26%) for organic
fertilizer, and (39 and 45%) for compost compared to the control, conducing to ameliorate
soil physical properties, where The main weight diameter, stable aggregate rate and soil
porosity were increased. Whereas, bulk density decreased significantly in both treatments
compared to the control. Compost treatment affect soil physical properties more than
organic fertilizer.Mineral fertilizer decreased soil content of organic carbon compared to
the control.
Humic and volvic acids contents were between 2.12 and 74.3 mg/kg aggregates in
the control,and compost treatments alternatively in macro aggregates (> 2mm). Wile,
volvic acid values were between 0.93 mg/kg in control for small aggregates (< 0.25), and
3.17 mg/kg aggregates in mineral fertilizer treatment for (0.25 – 2) aggregates.
Humification index values were less than 2 in macro aggregates, while it was bigger than 2
in small aggregates.
A research was carried out at Al-Sanouber research station in
Lattakia in 2013/2014 season ,The research included six treatments
with four replicates for each treatment. Six treatments used of
OMWW (0 , 10 , 20 , 30 , 40 , 50) l/m2. The OMWW has b
een
added 40 days before planting. Samples of soil have been taken
before adding OMWW, then after one and two months from
planting, and at the end of the season in order to make some
physical and chemical analysis and also to know the concentration
of some micro elements .
أجريت التجرية الحقلية في محطة بحوث المريعية بدير الزور لمدة خمس سنوات (2003-2008) حيث تم اضافة الفوسفوجبسيوم بمعدلات مختلفة
