Synopsis Maximum yields of 3.4 and 7.9 tons per acre of Ky. 31 fescue and Coastal bermuda, respectively, were obtained on Ruston loamy fine sand fertilized with up to 800 pounds of N per acre. Near maximum yields were obtained from 200 and 400 pounds of N per acre on fescue and Coastal bermuda, respectively. Coastal bermuda produced twice as much crude protein as fescue. Severe thinning of fescue stands occurred at the 400‐ and 800‐pound rates of N. Water soluble carbohydrate was considerably lower in fescue at these high rates of N.

Field investigations were i n i t i a t e d in 1971 to s t u d y t h e effect of a weat h e r e d fly ash sample on yield a n d n u t r i e n t c o n c e n t r a t i o n of corn (Zea mays L.) a n d on composition of displaced soil solutions, a n d to d e t e r m i n e rates of fly ash t h a t could be applied to soils w i t h o u t adversely affecting p l a n t growth. Application of w e a t h e r e d a s h at rates r a n g i n g from 18 to 288 metric t o n s / h a did n o t decrease corn grain yields on either Groseclose silt loam or Woodst o w n l o a m y fine sand. Corn grain yields were increased on t h e W o o d s t o w n soil in 1972 where c u m u l a t i v e rates of 216 a n d 288 metric t o n s / h a of fly ash were applied, which was a t t r i b u t e d in p a r t to increased soil moisture. P l a n t analysis d a t a i n d i c a t e d t h a t B a n d M n c o n c e n t r a t i o n s were not increased to toxic levels as h a d been r e p o r t e d in o t h e r investigations w i t h u n w e a t h e r e d fly ash. Soil solution d a t a verified t h a t toxic a m o u n t s of these elements were n o t released from t h e w e a t h e r e d a s h sample.Calcium c o n t e n t of displaced soil solutions was increased b y fly ash application b u t was n o t sufficiently high to effect increases in Ca c o n t e n t of corn tissue. T h e d a t a suggest t h a t t h e w e a t h e r e d fly ash u n d e r s t u d y could be applied to soils at c u m u l a t i v e rates of 288 m e t r i c t o n s / h a w i t h o u t inimically affecting crop growth.

The effect of three anaerobic swine waste lagoons on ground water quality was investigated in the Atlantic Coastal Plain region. The lagoons studied were located on high‐water‐table soils with different textures. Ground water was sampled from wells, with unperforated casings, located at depths to 6 m and distances to 30 m from the lagoons. These samples were taken monthly from September 1974 through January 1975, and bimonthly thereafter through November 1975. Ground water also was sampled in November 1975 from shallow wells with perforated casings located at distances to 36.6 m from two of the three lagoons. Constituents determined to investigate ground water contamination were density of fecal coliforms and concentrations of Cl, Cu, Mn, NH4‐N, NO3‐N, PO4‐P, and Zn.Chloride, NH4‐N, and NO3‐N concentrations in ground water samples indicated that seepage entered ground water from each of the three lagoons. Rupture of lagoon seals leading to seepage was attributed to drying of exposed subsoil or embankment soil during recession of lagoon liquid levels and to gas release from microbial activity in soil beneath the seal. Overall, a low level of ground water contamination occurred around a lagoon that was in operation for over 8 years in Myatt very fine sandy loam with a clay subsoil, and a lagoon that was in operation 1 mo prior to this investigation in Dragston fine sandy loam with a sandy clay loam subsoil. Ground water contamination in excess of recommended drinking water standards for Cl and NO3‐N occurred around the third lagoon. This lagoon was in operation for >8 years in a disturbed area consisting of predominantly sandy surface and subsurface soil. Ground water contamination in the embankment area of this lagoon was attributed to seepage and beyond the embankment area to ground water contamination from lagoon overflow.

Relatively high Cu concentrations occur in manure from hogs fed growth‐stimulating Cu levels. Concern exists that detrimental effects may occur in crop production from incorporation of the Cu‐enriched hog manure into agricultural soils. This research was conducted during three growth seasons to evaluate effects of Cu‐enriched hog manure applications on Cu availability, form, and mobility in one Alfisol and two Ultisols. Five field treatments applied to the three soils annually for 3 years were 33.6 and 67.2 metric tons/ha of wet manure from hogs on high‐Cu diets, Cu levels as CuSO4 equivalent to that in the manure, and a control. Copper concentrations in the hog feed ranged from 178 to 261 ppm during the 3 years. Amounts of Cu in manure used in the field experiments varied with Cu concentrations in the feed and ranged from 899 to 1,398 ppm. From 55.6 to 65.6 kg/ha Cu were incorporated into the soils over the 3‐years at the 67.2‐metric ton/ha manure rate. Application of these levels of Cu as either CuSO4 or Cu‐enriched hog manure did not decrease corn (Zea mays L.) grain yields on the three soils. In some cases, the Cu applications caused relatively small increases in Cu concentrations in corn ear leaves and grain. Diethylenetriaminepentaacetic acid (DTPA)‐extractable Cu data indicated that downward movement of Cu from Cu‐enriched hog manure application occurred in only one of the three soils. This soil contained relatively low amounts of clay and free Fe and Mn. Sequential Cu extraction data indicated that the applied Cu increased the potentially plant‐available soil Cu fractions and that a portion of the applied Cu reverted to relatively plant‐unavailable soil Cu forms.

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