الفهرس 
IntroductionOnly 14 pages are availabe for public view
 |  | from | 173 |  |  |
| | | from | 173 | | |
Abstract
The status of the available ( TPA-extraetrable) micronutrients (Fe,
Mn, Zn and Cu) in the soil under sali ity condition was investigated. Studies
envalved a survey study of 48 soil samples, 40 plant samples (barley and
cabbag) and 20 saline water sample collected from parts of Egypt irrigated
with saline waters, and relating resul s of salinity with micronutrients in soils
and plants. It also envolved 3 greenh use pot experiments (60-day duration)
under conditions of variable salinity an organic matter additions.
Experiment 1 envolved irrigati sorghum plant grown in a non-saline
clay loam with a non-saline water a d a saline water (EC of 0.32 and 4.01
dS/m respectively).
Experiment 2 envolved cultiva ing sorghum plant in a non-saline soil
(the same soil of experiment 1) and a line soil (both being clay loam, with
EC of saturation extrac( of: 3.16 dSI and 12.20 dS/m) both irrigated with
the non-saline water (of 0.32 dS/m).
Experiment 3 envotved cultivatin barley plant in a non saline clay soil
(EC= 1.35 dS/m ”saturation extractfl
) i igated with two agricultural drainage
waters (a diluted and non diluted sali e drainage water) having salinity
levels of 7.22 and 14.36 dS/m. resp ively and under no-leaching (LO)or
different leaching fractions; (half of th leaching (l1) or full value of the
leaching (l2) requirements); leachates were collected (ymere leaching was
allowed). A treatment having irrigation ’th distilled water (Withno leaching)
was conducted.
Results may be summarized as Ii
1. Survey study:
Soils irrigated with ’cultural drainage water and well .
water) showed greater! available Fe. no trend with regard to Mn, Zn or
Cu. Increased Fe availability was 8S!~ated mostly with soil organic matter
followed by soil salinity.
-------~--------- I ------~~ ~ .__
110
2. Pot experiments:
2.1. Dry weight of plants and micronutrient uptake:
Salinity of irrigation water decreased dry weight of sorghum or barley
plants and also decreased uptake of micronutrients.
2.2. Iron in soil and leachate.
Irrigating the non-saline soil with saline water gave greater available
Fe, while the saline soil irrigated with non-saline water contained less
inherent available Fe. Under irrigation with saline waters and leaching
conditions, soils conta(ned less available Fe, and more intense leaching
was associated with gre~ter amount of Fe found in leachates.
2.3. Manganese in soil and leachate.
There was more available Mn in the soil irrigated with saline water.
The lower contents of available Mn in the saline soil was a reflection of the
basic differences between the two soils. Under conditions of irrigation with
saline water, the soil contained more available Mn. Allowing leaching caused
a decrease in soil available Mn and leachates contained more Mn.
2.4. Zinc in soil and leachate.
There was less available Zn in the soil under irrigation with saline
water, as well as lower’ contents of available Zn in the saline soil. The
successive increasing of water salinity caused more available Zn in the soil,
while under leaching conditions there-was less availab,e Zn due to more Zn
removal from the soil.
2.5. Copper in soil and leachate.
There was slightly less available Cu in the soiUrrigated with saline
water. The saline soil Contained higher available Cu. .Under irrigation with
saline water and leachinQconditions1 less available Cu was found. This was
due to the losses of Cu by leaching.