A Study of Certain Physical Properties of a Vertisol in the Gezira Area, Republic of Sudan

Abedine, A. Zein El; Robinson, Glenn H.; Tyego, J.

doi:10.1097/00010694-196911000-00009

Cited by 14 publications

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“…A constant supply of Ca 2 + ions from Ca-zeolites in these soils most likely helps maintain a better drainage system. Because of such natural endowment with a soil modifier, no ill effects of high ESP (>15) in crop production in the vertisols of Gezira in Sudan (El Abedine et al, 1969;Robinson, 1971) and in Tanzania (Ahmad, 1996) were observed. In addition, some vertisols of the AD climate of western India produce deeply rooted crops such as cotton under rain fed conditions comparable to those of the Typic Haplusterts of the SAM climate of central India.…”

Section: Potassiummentioning

confidence: 99%

Vertisols of tropical Indian environments: Pedology and edaphology

2012

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This article appeared in a journal published by Elsevier. The attached copy is furnished to the author for internal non-commercial research and education use, including for instruction at the authors institution and sharing with colleagues. Other uses, including reproduction and distribution, or selling or licensing copies, or posting to personal, institutional or third party websites are prohibited. In most cases authors are permitted to post their version of the article (e.g. in Word or Tex form) to their personal website or institutional repository. Authors requiring further information regarding Elsevier's archiving and manuscript policies are encouraged to visit: http://www.elsevier.com/copyright

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Section: Potassiummentioning

confidence: 99%

Vertisols of tropical Indian environments: Pedology and edaphology

2012

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“…Improved aeration is quickly followed by development of new green leaves and increased ET until low total soil moisture at the end of a cycle again reduces ET. However, Abedine et al (1969) measured retentivity of these soils on a pressure plate and concluded that an air/water balance between 0*3 and 4 bar suction was not favourable to plant growth. It is noteworthy that the limited breakage of 23 March was not detrimental to soil aeration, because little water seeped on the surface, but the first stage of daily ET was 8-8 mm and the second dropped to 6-2 mm.…”

Section: Junementioning

confidence: 99%

Evapotranspiration Measured by a Neutron Probe on Sudan Gezira Vertisols

Fadl

1978

Ex. Agric.

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Daily measurements of moisture by neutron probe showed an erratic pattern of ET in the Sudan Gezira, attributed to the redistribution of water and development of cracks in a drying profile. However, dividing an irrigation cycle into periods of 3-5 days revealed a unique trend of ET that was consistently low in the early period, increased to a maximum in the middle, and fell off" at the end. Roots suffer from anaerobic conditions for about 5 days after flooding but subsequent drying and cracking improves soil aeration that leads to final depletion of profile moisture and depression of ET.

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Dynamics of cracking and swelling clay soils: Displacement of skeletal grains, optimum depth of slickensides, and rate of intra-pedonic turbation

Yaalon

Kalmar

1978

Earth Surf. Process.

117

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SUMMARYGrumusols (Vertisols), though having a uniformly high clay content with depth, commonly exhibit a coarsening upward in the sand fraction, either of skeletal grains or of nodules. The non-uniform way in which the wetting front advances in swelling clay soils, with preferred advance and swelling around the coarse grains, produces upward directional forces and uplifting of the grains, thus producing the observed textural differentiation in the coarse fraction.From observations of slickenside distribution in the profile, and using published data on the ratio of lateral to vertical stresses and swelling pressure distribution with depth, a concept of optimum depth for slickensides is developed. Generally at 15&200cm, below the depth of cracking, this depth depends in part on climatic conditions. Below the optimal depth increased overburden pressure and smaller moisture variations restrain the extent of swelling and deformation, above it drying produces cracks and obliterates large slickensides, though a strong bimasepic microfabric remains.The extent of intrapedonic turbation was estimated from measurements of the volume of cracks and of surface material falling into the cracks. It indicates a turnover time of several hundred to a few thousand of years. This agrees with the known increase of radiocarbon ages of organic matter (MRT) with depth which in Vertisols (Grumusols) is only slightly slower than in non-turbating Udolls (Chernozems) and Udalfs (Lessives). The moderate rate of homogenization due to intrapedonic turbation does not prevent the development of a normal organic carbon profile and it is slower than the upswelling of coarse grains by upward directional forces. The development of shear planes and slickenside structures is a rapid process and not dependent on turbation.

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A Study of Certain Physical Properties of a Vertisol in the Gezira Area, Republic of Sudan

Cited by 14 publications

References 0 publications

Vertisols of tropical Indian environments: Pedology and edaphology

Vertisols of tropical Indian environments: Pedology and edaphology

Evapotranspiration Measured by a Neutron Probe on Sudan Gezira Vertisols

Dynamics of cracking and swelling clay soils: Displacement of skeletal grains, optimum depth of slickensides, and rate of intra-pedonic turbation

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