Browse on keywords: water quality ID
Search results on 05/25/13
356. Anon.. 1989. Fine-tuning mix water.. Agrichemical Age, October 1989.
Herbicide performance can be greatly affected by the quality of the tank mix water. Water-soluble post emergent herbicides, such as glyphosate and phenoxys, seem to be most sensitive. Three factors are important: water pH; cation concentration; and suspended solids. Post-emergent herbicides perform best when the tank mix is acidic. Optimum for phenoxys and glyphosate is pH 3-4. Hard water will reduce activity when herbicides are mixed and stored for many hours. Cation effects on deactivation are as follows: most severe - Fe++, Fe+++, Al+++; severe - Ca++, Zn++; moderate - Mg++; minimal - K+, Na+. Water with suspended dirt or organic matter will bind with many herbicides.
433. Anon.. 1980. Groundwater quality in North Idaho.. USGS Water Resources Investigations Open File Report 80-596.
Map shows sites tested for nitrate nitrogen and resulting ranges; very few values above 1ppm.
1095. Brown, D.B., D. McCool, R. Papendick, and L. McDonough. 1985. Herbicide residues from winter wheat plots: effect of tillage and crop management.. J. Environ. Science 14:521-532.
Studied the magnitude and persistence of residues of metribuzin and bromoxynil octanoate in winter wheat plots under various tillage management. Herbicide loss was greatest where erosion was high. Herbicide runoff was extended under winter conditions in eastern WA, and there was little movement or degradation of herbicides when the ground was frozen. The half life of metribuzin was 102-112 days.
1308. Choi, K.L., S.S. Que Hee and R.G. Sutherland. 1976. 2,4-D levels in the south Saskatchewan river in 1973 as determined by a GLC method.. J. Environ. Sci. Health, Bll(2), 175-183.
2,4-D levels in the South Saskatchewan River near Saskatoon in 1973 at the height of the spraying season, and at harvest time were determined by a method involving direct GLC analysis, alkaline hydrolysis, followed by n-butylation of the liberated free acid after acidification of the alkaline solution, and confirmed by subsequent n-octylation. GC/MS also confirmed the presence of 2,4-D. 2,4-D was detected during the spraying season but not at harvest time or in river mud samples. The average level was ca. 2ug of acid equivalent to 2,4-D per liter of river water at the height of the spraying season.
1485. Crosby, J.W. and R.M Chatters. 1965. Water dating techniques as applied to the Pullman-Moscow groundwater aquifer. WSU College of Engineering Research Division Bull. #296.
Most groundwater dates from late Pleistocene glaciation. No measurable recharge in Moscow area in recent times. Pullman area has about 108 million gal/yr recharge, roughly 10% of current (1965) useage. Indicates low likelihood of ag chemical movement to primary aquifers. T: date analysis for specific wells.
3401. Johnson, L.C. and M. Molnau. 1975. Hydrograph and water quality relationships for two Palouse cropland watersheds.. ID Agr. Expt. Sta. Research Bull. #87.
Nitrate levels in streamflow appear linked to sub-surface drainage; high rates of surface runoff diminished nitrate levels. T: streamflow, water analysis.
6957. USDA. 1978. Palouse cooperative river basin study.. SCS, FS, ESCS - USDA.
Excellent summary of soil erosion problem and possible management approaches in the Palouse; extensive data on land use, soil erosion, future scenarios; history of agriculture in the area; bibliography.
10157. Wohld, M.. 1991 Mar.. Sidehill tiling successfully reducing erosion.. Washington Farmer-Stockman, p. 10A.
Installation of hillside tiles has been reducing erosion for some Missouri Flat Creek farmers by removing excess water from hillsides to drainage channels. The Palouse Conservation District plans to evaluate the practice. If benefits can be documented, sidehill drainages could become a practice which would qualify for state water quality improvement cost-sharing funds.