Impact of soil amendments on metribuzin and DCPA half-lives and mobility into agricultural runoff water

Abstract

The retention and behavior of two herbicides, metribuzin [4-amino-6-tert-butyl-4, 5-dihydro-3-methylthio-1, 2, 4-triazin-5-one] and DCPA [1,2,3,5, dimethyl] ester, in runoff and seepage water from agricultural fields were investigated. The objectives of this investigation were to: (i) determine the dissipation and half-life (T 1/2 ) of metribuzin and DCPA herbicides in soil under three management practices: chicken manure (CM), sewage sludge (SS), and no-mulch native soil (NM); (ii) monitor herbicides residues in runoff and infiltration water following addition of soil amendments; and (iii) determine the impact of soil amendments on the transport of NO 3 , NH 4 , and PO 4 from soil into surface and subsurface water. Half-life (T 1/2 ) values of metribuzin were 24, 18, and 12 d in CM, SS, and NM treatments, respectively. Similarly, T 1/2 values of DCPA were greater in CM and SS incorporated soil (45.8 and 52.2 d, respectively) compared to NM native soil (26.2 d). Addition of CM and SS to native agricultural soil increased water infiltration, lowering runoff water volume and herbicide residues in runoff following natural rainfall events. We concluded that soil amendments could be used to intercept pesticide-contaminated runoff from agricultural fields. This practice might provide a potential solution to pesticide contamination of surface and seepage water from farmlands.

Mapping Land Used After Bricks Mining Area at Potorono Village Banguntapan Yogyakarta

“…The activity miners will be stopped after found hard layers conditions, its can not be used for the manufacture of bricks with bulk Dencity >1.4 g/cm 3 . The Farmers in the productive land will use rice cultivation with input high nutrient from the amelioration and has similar good water, while in the area post mining nothing irrigation condition is insufficient for paddy soil then the farmers land use cultivator with dryland plants i.e chili, zea mays and beans (Antonious et al, 2014;He et al, 2012;Johnson et al, 2010;Kato et al, 2012;Wick et al, 2013). To According farmers post mining was used any ameliorant source organic manure not so good production in the field.…”

“…The mining was done in the village Potorono is brick mine, the soil was taken from top soil until subsoil by mine. Mining was carried out continuously will cause damage to land, soil losse on the top soil until sub soil was taken effect in soil degradation on quality became production of crops would be lower (Antonious et al, 2014). Mining on productive land leads to lower crop production, declining soil nutrients and organic matter, losse clay content, and increased bulk density (Costantini & Lorenzetti, 2013).…”

Reducing Herbicide Residues from Agricultural Runoff and Seepage Water

“…In soil, biodegradation of DCPA into tetrachlorophthalic acid, which is extremely mobile in the environment, is slow [90]. Work carried out by Antonious et al [30] revealed that runoff water volume from no-mulch soil (200,000 L plot −1 ) was significantly greater than runoff from soil amended with chicken manure and sewage sludge-amended soils (45,000 and 85,000 L plot −1 , respectively). This might be due to reduced bulk density and increased soil interspaces after addition of soil amendments that increased water infiltration into the soil column toward the vadose zone (the unsaturated water layer below the plant root), reducing surface water runoff from chicken manure and sewage sludge incorporated soil.…”

“…Addition of soil amendments such as chicken manure and sewage sludge to native agricultural soil increased water infiltration, lowering runoff water volume and herbicide residues in runoff following natural rainfall events. Studies revealed that increasing soil organic matter by the addition of soil amendment to native soil reduced the transport of dimethyl tetrachloroterephthalate (DCPA, dacthal) herbicide down the land slope into runoff water [30]. The use of sewage sludge in land farming could become a useful technique for trapping herbicides such as trifluralin [31] and dimethazone [32,33], metribuzin [30], and napropamide [34].…”

“…Studies revealed that increasing soil organic matter by the addition of soil amendment to native soil reduced the transport of dimethyl tetrachloroterephthalate (DCPA, dacthal) herbicide down the land slope into runoff water [30]. The use of sewage sludge in land farming could become a useful technique for trapping herbicides such as trifluralin [31] and dimethazone [32,33], metribuzin [30], and napropamide [34]. In addition to soil amendments, slot-mulch techniques (biobeds or biofilters-a cavity in the ground filled with a mixture of composted organic matter, topsoil, and a grass layer on top) provide a potential solution to herbicide contamination of surface waters arising from agricultural fields.…”