Saber, R., Al-Kayssi, A. (2021). PREDICTION OF SOIL HARD-SETTING USING SOIL MOISTURE RETENTION DATA AND ITS RELATION WITH DEGREE OF GYPSIFEREOUS SOIL COMPACTNESS. Alustath, 19(2), 182-194. doi: 10.32649/ajas.2021.175872
R. K. Saber; A. A. Al-Kayssi. "PREDICTION OF SOIL HARD-SETTING USING SOIL MOISTURE RETENTION DATA AND ITS RELATION WITH DEGREE OF GYPSIFEREOUS SOIL COMPACTNESS". Alustath, 19, 2, 2021, 182-194. doi: 10.32649/ajas.2021.175872
Saber, R., Al-Kayssi, A. (2021). 'PREDICTION OF SOIL HARD-SETTING USING SOIL MOISTURE RETENTION DATA AND ITS RELATION WITH DEGREE OF GYPSIFEREOUS SOIL COMPACTNESS', Alustath, 19(2), pp. 182-194. doi: 10.32649/ajas.2021.175872
Saber, R., Al-Kayssi, A. PREDICTION OF SOIL HARD-SETTING USING SOIL MOISTURE RETENTION DATA AND ITS RELATION WITH DEGREE OF GYPSIFEREOUS SOIL COMPACTNESS. Alustath, 2021; 19(2): 182-194. doi: 10.32649/ajas.2021.175872

PREDICTION OF SOIL HARD-SETTING USING SOIL MOISTURE RETENTION DATA AND ITS RELATION WITH DEGREE OF GYPSIFEREOUS SOIL COMPACTNESS

ANBAR JOURNAL OF AGRICULTURAL SCIENCES
Article 5, Volume 19, Issue 2, December 2021, Pages 182-194    PDF (2.04 M)
Document Type: Research Paper
DOI: 10.32649/ajas.2021.175872
Authors
R. K. Saber* 1; A. A. Al-Kayssi2
1Department of Soil Sciences and Water Resources, College of Agriculture, Tikrit University, Iraq
2Tikrit University, College of Agriculture
Abstract
A laboratory experiment was carried out to predict soil hard-setting index (H-index) depending on soil moisture retension curve and its relationship soil degree of soil compactness (%DC) for seven soil samples with different gypsum content (62-443 g kg-1). Soil samples with (G2) 106, (G3) 153, (G4) 202, (G5) 245 and (G6) 337 g kg-1 gypsum content were prepared by mixing of surface soil layer soil with low gypsum content (G1) 62 g kg-1 with sub-surface with high gypsum content (G7) 443 g kg-1. The soil moisture retension curve of the soil samples were measured at tensions 0,5, 15, 33, 100, 500, 700, 1000 and 1500 kPa and at the soil bulk densities 1.2, 1.4, 1.6 and 1.8 Mg m-3. Soil hard setting (H-index),was determined according to van Genuchten-Mualem equation. The results indicate that soil hard setting index ( H-index) was negatively correlated with soil gypsum content. It decreases with increasing soil gypsum content. The soil bulk density was positively correlated with H-index, and Degree of soil compaction (%DC) was positively correlated with H-index for all gypsiferous soil samples.
 

 
Keywords
oil hard-setting; Degree of compaction; Gypsiferous soils
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