13.07.2015 Views

Service Contract No 2007 / 147-446 Strategic ... - Swaziland

Service Contract No 2007 / 147-446 Strategic ... - Swaziland

Service Contract No 2007 / 147-446 Strategic ... - Swaziland

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Many factors intervene in determining the impacts of agriculture on water quality, e.g.amount of product applied in relationship to absorbing capacity; form of application (e.g.application of fertiliser through a drip system will minimise run-off); soil characteristics (typeof soil, compaction, erosion); irrigation system in use; drainage systems; distance to waterbodies; presence of riparian vegetation; rainfall (periodicity, volume and intensity); time ofapplication (applications during the dry season will have less impact) and properties of thepollutants (more soluble components such as nitrate and sulphate tend to be more mobile,whilst less-soluble ones like phosphate and ammonium are relatively immobile throughleaching).Run-off refers to surface drainage, whereas leaching refers to subsurface drainage. In thecase of subsurface drainage, it is the soluble chemical products (leachates) that are carried,affecting chemical composition of deeper soil strata or groundwaters, or flushing thesepollutants into waterways.As well the degree of contamination of water bodies will depend on the physico-chemicalcharacteristics of the products used (e.g. toxicity levels, oxygen demand) and the dilutionprovided by the receiving water body. Table 16 below shows the agrochemical productcomponents commonly used in sugar cane farming in <strong>Swaziland</strong>.Table 16:Agrochemical components commonly used in the Swazi sugar industryRipeners Garlon 4 (triclopyr) Velpar DF (hexazinone)Ethrel (Ethepon) Gramoxone (paraquat) Veloxytril(ioxynil+bromoxynil)Fusilade Forte (fluazifop-Pbutyl)HexazinoneFertilisersVolley 125EC Lumax (mesotrione+S-metol.+terbuthyl) OrganicFungicides MCPA (methoxone) Green manure cropsEria (limited use) Merlin (isoxaflutole) StillageHerbicides Metrad (diuron + metribuzin) Mill ashAcetochlor Metribuzin Kraal manureAlachlor MSMA Chicken manureAmetrynParabat 500 + Extreme Plus(pendim+chlori-ethl-metribuzin)InorganicAtrazine Pendimethalin Ammonium sulphateAuthority (sulfentrazone) Roundup (glyphosate) Di-ammoniumphosphateDiuron Servian (halosulfuron) Mono-ammoniumphosphateEptam Super (EPTC) Tebusan (tebuthiuron) Muriate of potashExtreme Plus (chlorimuronethyl+ metribuzin)Terbo (terbuthylazine+bromoxynil)Potassium chlorideFalcon Gold (metolachlor) Tolla (metolachlor) Single superphosphateFusilade Forte (fluazifop-Pbutyl)Touchdown Forte (glyphosate trimesium)UreaRDMU (<strong>Strategic</strong> Environmental Assessment of the National Adaptation Strategy) - Page 93

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