SOIL CRUSTING AND ITS EFFECT ON SEEDLING EMERGENCE | ||||
| Journal of Soil Sciences and Agricultural Engineering | ||||
| Article 7, Volume 27, Issue 6, June 2002, Page 4249-4254 PDF (2.04 MB) | ||||
| Document Type: Original Article | ||||
| DOI: 10.21608/jssae.2002.255144 | ||||
 View on SCiNiTO | ||||
| Author | ||||
| s. s. AI-Oud | ||||
| Soils and Water Dept., College of Agric. and Vet. Medicine, King Saud University Branch, AL-Gassim" Saudi Arabia' | ||||
| Abstract | ||||
| Crusting is commonly found in arid and semi-arid regions, As water evaporates, soil surface becomes charged with relatively high concentration of sodic salts; and consequently with a high ESP. The crust formation is due to two compiementary mechanisms: (1) mechanical breakdown of soil aggregates by beating action of raindrop, followed by compaction of a thin layer at soil surface: and (2) chemical dispersion of clay which depends on soil ESP and electrolyte concentration of applied water. Low organic matter content, high ESP, and high silt content make soil surface sustainable to crusting, Soil crust has an adverse effect on soil characteristics such as: . infiltration' and gas exchange. It also restrict the emergence of seedtinqs .. | ||||
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