Keywords : surge
Effect of surge and continuous irrigation method on some of the infiltration characteristics and ratio of water provision in the broad furrow
ANBAR JOURNAL OF AGRICULTURAL SCIENCES,
2012, Volume 10, Issue 1, Pages 128-143
A field experiment was conducted in a sandy loam soil containing 16.60% gypsum, to study the effect surge irrigation and continuous irrigation on some infiltration characteristics and on the ratio of water saving in broad furrow irrigation . Complete randomizing design ,with three replicates per treatment was used in this study ,and the important results were decreasing in the advance time water front in the case of continuous irrigation with significant differences with the passage of time from the first irrigation where it was 2.68 minutes and even tenth irrigation where became 2.43 minutes. and increased the time of advance phase with significant differences also in the case of surge irrigation with the passage of time from the first irrigation where it was 2.60 minutes ,and even eighth irrigation reaching 3.2 minutes . the total time for irrigation and the amount of water added are the least with significant differences in the case of surge irrigation until the eighth irrigation. providing high water when we follow the method of surge irrigation from the first irrigation, reaching 8.90% then decreased with time to 3.34%at the eighth irrigation with significant differences , and it is lack of irrigation in the ninth and tenth, and low rates infiltration in the case of surge irrigation during the time of irrigation reaching 18.66cm.h-1 compared with 20.26 cm.h-1 in the case of continuous irrigation ,but without significant differences. resulted in the passage of time with repeat irrigation to reduce the rates of infiltration with significant differences in both irrigation method for following .increase the rate of the advance pace of the water front with significant differences in both the second and third surge ,reaching 3.91 m.minutes-1 and 4.05 m.minutes-1 respectively ,compared with 2.62 m.minutes-1 of the first surge, and this is in the case of surge irrigation.
Results of this work indicate that the method of surge irrigation is also suitable for the broad furrow irrigation ,and this achieved through the saving of irrigation water ,for this we recommend using it when planting crops that are more successful in this type of furrow .
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 .