Keywords : gypsiferous soil
ANBAR JOURNAL OF AGRICULTURAL SCIENCES,
2013, Volume 11, Issue 2, Pages 226-240
Experiment was conducted at Al-Anbar university, Ramadi city to study the effects of fuel oil and shenmblan plant on some hydraulic properties of the gypsum soil . After dilution with benzene, fuel oil was mixed with soil in the ratio of 1 and 2 % based on soil dry weight. The plant was air dried and sieved through 2 cm diameter sieve and mixed with the soil in the ratio of 2, 4 and 6 % based on soil dry weight. Fuel and shenmblan plant mixed soil was incubated at field capacity for 30 days. Control was let without any addition.
Horizontal water infiltration was estimated . Soil water diffusivity and Weighted Mean diffusivity was calculated. Unsaturated hydraulic conductivity as a function of volume moisture content. Data of distance of wetting front development with time were used for estimation of soil water permeability .Sorptivity was estimated from data of horizontal water infiltration in soil columns.
Results could be briefed as follows:
Soil water diffusivity and weighted mean diffusivity decreased when fuel oil and shenmblan plant were added. The decrease continued with increase in fuel oil and shenmblan plant ratios. unsaturated hydraulic conductivity decreased as fuel oil and shenmblan plant ratios increased. Addition of fuel oil and shenmblan plant caused a decrease in soil Penetrability to water . This decrease continued with increasing the ratios of fuel oil and shenmblan plant. Permeability value was 2.4980 cm/min1/2 for control and became 2.2084 and 2.1598 cm/min1/2 for l and 2 % fuel oil treatments, respectively, and 2.3160, 2.1916 and 1.8648 cm/min1/2 for 2 , 4 and 6 % of the shenmblan plant treatments , respectively . Sorptivity decreased when fuel oil and shenmblan plant were added .The value was 1.9057 cm/min1/2 for control, and became 1.8461 and 1.8095 cm/min1/2 for land 2 % fuel oil treatments, respectively, and 1.5414, 1.4705 and 1.2463 cm/min1/2 for 2, 4 and 6 % of the shenmblan plant treatments, respectively.
ANBAR JOURNAL OF AGRICULTURAL SCIENCES,
2007, Volume 5, Issue 1, Pages 33-39
A. I. Al-Abaid
College of agriculture / Anbar University
This research is performed at Anbar University site in gypsiferous soil classified as Gypsiorthids (37 % gypsum).to study the effect of cycle ratio time on infiltration behavior in surge infiltration state .at a steady time (2 minute )with continuity the second surge (8 h. ). Three ratios 1/4, 1/8 and 1/16were chosen to realize which minimize of them will achieve more success than the others to irrigation water under this system as compared to continues infiltration.
The experiment is designed in accordance with randomized complete block design (RCBD) with three replicates by using double rings infiltrometer.
The results showed that the infiltration rate doesn’t have constant decline in the gypsiferous soil as compared to normal behavior of other soils. The infiltration rate in the continues infiltration state decreased till 120 minutes reaching 7.40 cm.h-1 then it increase reaching 13.53cm.h-1 at the end of the test (8 h.).but in surge infiltration the infiltration rate decreases to 16.80 cm.h-1 after 120 minutes at the ratio 1/4 then reaches 19.77 cm.h-1 at the end of the test. At ratio 1/8 the decreasing occurs after 3 minutes to 13.80 cm.h-1 ,and continued to increase reaching 59.47 cm.h-1 at end of test .While at ratio 1/16 it reaches 9 cm .h-1 after 5 minutes and it increases till it reaches 27.40 cm.h-1 at the end of test .
One of the important results in this study is that the surge cumulative infiltration for the three ratios (161.63, 330.17 and 181.07 cm) higher than continues cumulative infiltration(91.38 cm only). This indicates that these ratios un successful in water discharge in this gypsiferous soil .The results also showed that the infiltration rates is not steady along measurement time , it start with high rates then decrease ,and increase continuously till final measurement with fluctuating in declination and in increasing.
The results showed that the basic infiltration rate for surge infiltration is higher than the continues infiltration at significant deferent’s showing the following results :19.77, 59.47 and 27.40 cm.h-1 respectively ,while it was 13.53 cm.h-1 for continues infiltration.
The pausing infiltration time for surge infiltration is ceases for one minute only in second surge beginning of one replicate of the ratio:1/4 and 1/16 .