riverina branch australian society of soil science soil science soil management irrigation salinity cotton australia geology sodicity riverina soil acidity murray-darling basin soil database parna wind erosion soil organic matter agriculture soil mapping rice manure nitrogen mineralisation leaching geomorphology subplasticity crop rotation compost carbon dioxide hardsetting vertosol almond management horticulture technology nitrogen almond nitrification grain legumes environmental flows wetland watering social research archeology soil atlas soil test hydrology murrumbidgee irrigation area biochar root biology soil carbon
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