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|Statement||by S.H. Anderson and H.V. Kazemi.|
|Series||Paper / American Society of Agricultural Engineers -- no. 88-2641., Paper (American Society of Agricultural Engineers) -- no. 88-2641.|
|Contributions||Kazemi, Hossein Varnamkhasti., American Society of Agricultural Engineers. International Winter Meeting|
|The Physical Object|
|Pagination||19 p. :|
|Number of Pages||19|
Download Field variability of atrazine leaching under no-till management
Therefore, a 3-year field study was conducted to determine the effect of reversing the tillage of 7-year-old NT and CT plots on the leaching of atrazine (6-chloro-N-ethyl-N'-(methylethyl)-1,3,5.
The most extreme tillage change (relative to moldboard plowing) is no-till. Since the environmental fate of pesticides used in such agronomic systems is not clearly known, our objective was to determine the persistence and leaching of atrazine, alachlor, and cyanazine beginning 3 years after annual applications at normal rates to no-till by: The objective of this study was to determine spatial variability of transport and degradation parameters for a bromide tracer and atrazine herbicide in a ha field of alluvial soils under no-till management.
The soil investigated was a Sarpy (mixed, mesic Typic Udipsamment) with surface texture varying from sand to by: 2 No-Till in Kansas: Impacts of No-till on Water Quality.
conventional tillage in the first runoff. event following spring planting. In subsequent runoff events, similar levels of water runoff occur with either tillage system. The greater water runoff in no-till in the first runoff event may be explained. by two different possibilities.
The first. Kazemi et al. () previously reported geostatistical ranges of 20 and 23 m for v, and of 12 and 24 m for the D of bromide in a ha alluvial field under no till management.
By contrast, Gupte. Total amounts of atrazine in the sampled profile (0- to cm depth) were also generally lower under no-till than conventional till. More leaching below 10 cm occurred under no-till than.
We investigated atrazine [2‐chloro‐4‐(ethylamino)‐6‐(isopropyl‐amino)‐s‐triazine] leaching, sorption, and desorption in a Brazilian Oxisol under no‐till (NT) and conventional (CON) agricultural specific objectives were (i) to infer characteristics of the sorption process (equilibrium vs.
nonequilibrium sorption, reversible vs. nonreversible sorption) from. Laboratory studies were conducted to evaluate effects of tillage reversal and rainfall on 14C-atrazine (2-chloro4-ethylaminoisopropylamino-s-triazi.
A field site was established at Beltsville, MD, in to assess the effect of conventional and no‐till cultural practices on the movement of pesticides into shallow groundwater.
Groundwater samples. Atrazine (2‐chloro‐4‐ethylamino‐6‐isopropylamino‐s‐triazine) transport was affected by the factors influencing the amount of preferential flow and by the time of storms relative to the time of herbicide application.
Atrazine movement in earthworm burrows was greatest when high‐intensity rainfall occurred shortly after application. The number of observations required to yield an estimate of the mean pore water velocity within a prescribed accuracy is shown to depend upon the nature and extent of the spatial variability of the field soil.
For the field examined, observations would allow the mean pore water velocity to be estimated within ±50% of its true value.
The reduction in atrazine Field variability of atrazine leaching under no-till management book is likely due to the slow release from the starch granules and subsequent diffusion into the son matrix where it is less subject to preferential flow processes.
In this study temporal variation of atrazine concentration andits downward movement in the corn root zone under two waterregimes in Daneshkadeh soil series (Fine, mixed, mesic,Calcixerollic Xerochrepts) were investigated.
We also assessedthe risk of soil and water contamination due to this herbicideapplication. Atrazine application rate was kg a.i./hafollowed by two irrigation treatments. The Monte Carlo risk assessment predicted that if mg/ of atrazine was applied at the experimental site on 1 Augustthen the mean cumulative mass per unit area of atrazine expected to leach below the root-zone (30 cm) by 18 January was 49 mg/, with a standard deviation of (Table 4).
Hutson's 27 research works with 1, citations and reads, including: Using expert systems and simulation modelling for land evaluation at farm level: A case Field variability of atrazine leaching under no-till management book from New York State.
We used lab and field experiments to determine biochar impacts on atrazine leaching under increasingly heterogeneous soil conditions. Application of pine chip biochar (commercially pyrolyzed between and °C) reduced cumulative atrazine leaching by 52% in homogenized (packed) soil columns (p = ).
• Atrazine is a preemergence and postemergence herbicide for control of many annual broadleaf and some grass weeds in corn.
• Atrazine is moderately persistent in the soil. As a result, it is subject to field loss for a longer time period.
• Atrazine can leach downward through the soil profile and enter groundwater used as drinking water. Isensee A.R., Sadeghi A.M. () Interactions of tillage and rainfall on atrazine leaching under field and laboratory conditions, Chemosph – Google Scholar Isensee A.R., Nash R.G., Helling C.S.
() Effect of conventional vs. no-tillage on pesticide leaching to. Reducing tillage intensity through the implementation of conservation practices is a way to reach a more sustainable agriculture. Reducing tillage is indeed an efficient way to control soil erosion and to decrease production costs.
Nonetheless, the environmental impact of reduced tillage is not well known because conservation techniques may induce strong changes in soil physicochemical. Delphin JE, Chapot JY () Leaching of atrazine, metolachlor and diuron in the field in relation to their injection depth into a silt loam soil.
Chemosphere – Google Scholar Doran G, Eberbach P, Helliwell S () The mobility of thiobencarb and fipronil in two flooded rice-growing soils.
1 and 2 under no-till management and Fields 3 and 4 under tillage. All tillage systems were under continuous corn produc-tion, and rye (Secale cereale. L.) was planted in the fall as a winter cover crop.
The two tilled fields were plowed to =17 cm every spring, incorporating corn and rye plant residues. Tillage most affects the large pore spaces, including macropores, which dominate percolation through field soils. Rain events are expected to promote post‐tillage changes in pore geometry.
Pore‐geometric influences on macropore transport were examined under multiple rains, in a Kingsbury clay soil under no‐till (NT) and plow‐till (PT). Factors affecting the preferential flow of water and atrazine through earthworm burrows under continuous no-till corn.
Journal of Environmental Quality, 22 Herbicide leaching under tilled and no-tillage fields. Journal of the American Soil Science Spatial-temporal variability of preferential flow in a clay soil under no-till and plow.
ELSEVIER Journal of Contaminant Hydrology 20 () JOURNAL OF contaminant Hydrology Nitrogen and water management strategies to reduce nitrate leaching under irrigated maize J.S. Schepers *, G.E. Varvel, D.G. Watts Soil Scientists, USDA-Agricultural Research Seruice and Agronomy Department; and Agricultural Engineer, Biological Systems Engineering.
A methodology is developed to quantify the uncertainty in a pesticide leaching assessment arising from the spatial variability of non-georeferenced parameters.
A Monte Carlo analysis of atrazine leaching is performed in the Dyle river catchment (Belgium) with pesticide half-life (DT50) and topsoil organic matter (OM) content as uncertain input parameters.
Atrazine DT50 is taken as a non. A precision agriculture system defined by two main management zones was implemented from to wheat (Triticum aestivum. L.) and soybean in 60% of the field, and corn and soybean in the remaining 40%. The system included no-till, cover crops, atrazine split-applications based on weed pressure, variable rates of nitrogen (N).
A study was carried out in a loamy soil to evaluate the degradation of atrazine and metolachlor under laboratory-controlled and field-variable conditions as a function of temperature and soil moisture content.
In laboratory trials, metolachlor showed fast degradation, with half-lives from to days in a temperature range from 5 to 35 °C at % of field capacity, whereas in the same.
We conducted this study to determine the three-dimensional variability of atrazine and chloride movement within a small volume of soil (2, cm 1) under field conditions. A 1-m 2 area of Williamson silt loam (coarse-silty, mixed, mesic, Typic Fragiochrept) was sprayed uniformly with atrazine ( kg ai/ha) and chloride (80 kg/ha).
The primary goal of this research was to better understand the magnitude and temporal dynamics of DRP export from an artificial drain line and the variability of subsurface DRP leaching within a long‐term, no‐till field.
Dissolved reactive P in drain line. Spatial variability of atrazine sorption parameters and other soil properties in a podzoluvisol Diederik Jacques a,), Christophe Mouvet b, Binayak Mohanty c, Harry Vereecken d, Jan Feyen a a Institute for Land and Water Management, Katholieke Uni˝ersiteit Leu˝en, Vital DecosterstraatB.
Total amounts of atrazine in the sampled profile (0- to cm depth) were also generally lower under no-till than conventional till. More leaching below 10 cm occurred under no-till than conventional till, particularly in and when rain fell soon after application. Variation in soil atrazine levels among years was related to timing and.
In no-till farming, crop residues are left on the surface, where the nutrients that result from their decay can leach into the soil. This leaching process is far more thorough than you might imagine.
ATRAZINE LEACHING IN KENT COUNTY, MICHIGAN By DJ. Holtschlag and C.L. Luukkonen ABSTRACT A steady-state model of pesticide leaching through the unsaturated zone was used with readily available hydrologic, lithologic, and pesticide characteristics to estimate the vulnerability of the near-surface aquifer to atrazine contamination from.
Atrazine can travel (seep or leach) through soil and can enter ground water which. not be applied within 66 feet of the points where field surface water runoff enters Do not apply under conditions that favor runoff or wind erosion of soil containing. Atrazine can travel (seep or leach) through soil and can enter ground water which may be used as drinking water.
Atrazine has been found in ground water. Users are advised not to apply atrazine to sand and loamy sand soils where the water table (ground water) is close to the surface and where these soils are very permeable, i.e., well drained.
observed (patrazine leaching and dissipation rate in different soil profiles in the four sampling regions were high and significant. Therefore, there is a high risk of atrazine pollution in groundwater resources of the region. Key words: Atrazine, Soil, Shiraz, Dissipation rate, Pesticide fate.
Pang L, Close ME () A field tracer study of attenuation of atrazine, hexazinone and procymidone in a pumice sand aquifer.
Pest Management Scie Pang L, Close ME, Watt JPC, Vincent KW () Simulation of picloram, atrazine, and simazine leaching through two New Zealand soils and into groundwater using HYDRUS-2D. Field-scale data did show some differences in discharge between this field during the conventional period and other fields with no-till management systems.
However, different bio-physical characteristics of the fields (i.e., slope, slope length, and depth to clay) and differences in management prior to the experiment may have affected the. Research Project: Long-term Management of Water Resources in the Central Mississippi River Basin Location: Cropping Systems and Water Quality Research Annual Report.
Objectives (from AD): Objective 1: Determine linkages between stream water quality and field characteristics through field and watershed scale studies. 1a: Improve the Phosphorus (P) Index on claypan soils. removed from a field site that had been under no-till management since To remove field cores, a cm diameter cylinder was pushed into the ground and excavated.
The soil cores were subsequently trimmed to a 3-cm depth in the laboratory. During the coring, excavation, and column length reduction, attempts were made to keep surface liter. The field site is located in a flat valley (mean slope less than ‰) with a clay soil of marine origin in eastern Sweden.
The experimental field ( ha) with 28 plots (24 m × 20 m) was tile-drained in to m depth (8 m spacing). 9 Twenty-four of these plots were used in the.The herbicide atrazine is used extensively throughout the United States, and is a widespread groundwa-ter and surface water contaminant.
Biochar has been shown to strongly sorb organic compounds and could be used to reduce atrazine leaching. We used lab and ﬁeld experiments to determine biochar impacts on atrazine leaching under increasingly.
Free Online Library: Study of the bioremediation of atrazine under variable carbon and nitrogen sources by mixed bacterial consortium isolated from corn field soil in Fars province of Iran.(Research Article, Report) by "Journal of Environmental and Public Health"; Health, general Atrazine Environmental aspects Waste management Bacteria Bioremediation Methods.