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Reclamation Experiments in the Sudan Gezira
Soil Reclamation in Northern India
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alkali soil alkaline ALLUVIAL SOIL application of gypsum applied base exchange bicarbonate calcareous calcium carbonate calcium chloride calcium clay calcium sulfate carbon dioxide chernozem chestnut soil climate columnar solonetz content of exchangeable cotton crop crust Cyperus deposited Diagram displace drainage evaporation exchangeable calcium exchangeable hydrogen exchangeable magnesium exchangeable sodium fertile field drains flooded grass ground water hectares high content high proportion impermeable improvement irrigation water layer less low salt content lower M. L. Mehta mainly material milligram-equivalents per liter movement of water organic matter particles percent percentage plant roots podzol present proportion of exchangeable proportion of sodium pumping Punjab R. C. Hoon rainfall reclamation region remove rice saline soils salty land Salty soils seepage shallow depth sodium chloride sodium clay sodium sulfate soil profile soils contain soils occur solodi solonchak solonetz soils soluble salts strongly alkaline subsoil sulfur topsoil vegetation water containing water table weakly acid