caa a22 4500 477111599 CHVBK 20180405111610.0 cr unu---uuuuu 170330e19960301xx s 000 0 eng 10.1007/BF00015412 doi (NATIONALLICENCE)springer-10.1007/BF00015412 Mechanism of crust formation on a soil in central Iran [Elektronische Daten] [Mostafa Eghbal, Mohammad Hajabbasi, Hossein Golsefidi] Crust formation on soils around Isfahan reduces infiltration and seedling emergence in cultivated lands. Mechanism of crust formation on local soils was investigated under field condition. Soil and crust samples from a field under furrow irrigation were taken for physical, chemical and micromorphological analysis. Seedling emergence of sugar beets (Beta vulgaris) reduced by 50% due to crust forming after the first irrigation. Rise of water table, increase of exchangeable sodium percentage to 6.4, and higher silt content resulted in higher susceptibility of soil to crust formation. Crust forming inside furrows was thicker and usually consisted of 3 layers as compared to a thinner crust formed on beds with only 2 layers. Layers found in crusts of Lavark soil generally had less sand and more silt and fine clay compared to the overall Ap horizon. Silt and fine clay in the middle M2 layer of crust forming on furrows were increased from 51.6 and 5.6 to 59.8 and 21.1 percent respectively. Percolation of finer particles through and inside the pores created layers that were denser and less porous. Chemical dispersion of particles together with physical deterioration of surface structure by long period of mechanized agriculture in the area are probably the main reasons for crust formation. ei]B E Clothier Kluwer Academic Publishers, 1996 Beta vulgaris nationallicence crust formation nationallicence infiltration nationallicence micromorphology nationallicence seedling emergence nationallicence Eghbal Mostafa College of Agriculture, Isfahan University of Technology, Isfahan, Iran aut Hajabbasi Mohammad College of Agriculture, Isfahan University of Technology, Isfahan, Iran aut Golsefidi Hossein College of Agriculture, Isfahan University of Technology, Isfahan, Iran aut Plant and Soil Kluwer Academic Publishers; gopher://gopher.wkap.nl 180/1(1996-03-01), 67-73 0032-079X 180:1<67 1996 180 11104 https://doi.org/10.1007/BF00015412 text/html Onlinezugriff via DOI 1 research-article jats NATIONALLICENCE 856 40 https://doi.org/10.1007/BF00015412 text/html Onlinezugriff via DOI NATIONALLICENCE 700 1- Eghbal Mostafa College of Agriculture, Isfahan University of Technology, Isfahan, Iran aut NATIONALLICENCE 700 1- Hajabbasi Mohammad College of Agriculture, Isfahan University of Technology, Isfahan, Iran aut NATIONALLICENCE 700 1- Golsefidi Hossein College of Agriculture, Isfahan University of Technology, Isfahan, Iran aut NATIONALLICENCE 773 0- Plant and Soil Kluwer Academic Publishers; gopher://gopher.wkap.nl/ 180/1(1996-03-01), 67-73 0032-079X 180:1<67 1996 180 11104 Metadata rights reserved Springer special CC-BY-NC licence nationallicence BK010053 XK010053 XK010000 NATIONALLICENCE NATIONALLICENCE NL-springer