Author

John A. Shaffer

Observed names: J. A. SHAFFER, J. A. Shaffer, J.A Shaffer, J.A. Shaffer, JOHN A. SHAFFER, John A Shaffer

Institution: Pennsylvania State University

Observed institutions: Pennsylvania State University, Agricultural Research Service, United States Department of Agriculture

OpenAlex ID: A5110165497

Evaluation of soil organic carbon under forests, cool-season and warm-season grasses in the northeastern US

1999 · M.D Corre, R.R Schnabel, et al. · Soil Biology and Biochemistry · 98

Denitrification in a Grassed and a Wooded, Valley and Ridge, Riparian Ecotone

1996 · R. R. Schnabel, L. F. Cornish, et al. · Journal of Environmental Quality · 71

Switchgrass and Big Bluestem Responses to Amendments on Strongly Acid Soil

1988 · G. A. Jung, J. A. Shaffer, et al. · Agronomy Journal · 55

Warm‐Season Grass Diversity in Yield, Plant Morphology, and Nitrogen Concentration and Removal in Northeastern USA

1990 · G. A. Jung, J. A. Shaffer, et al. · Agronomy Journal · 54

Effects of Soil and Nitrogen on Water Use Efficiency of Tall Fescue and Switchgrass Under Humid Conditions

1988 · W. L. Stout, G. A. Jung, et al. · Soil Science Society of America Journal · 50

Performance of ‘Grasslands Puna’ Chicory at Different Management Levels

1996 · Gerald A. Jung, John A. Shaffer, et al. · Agronomy Journal · 39

Forage Dry Matter Accumulation and Quality of Turnip, Swede, Rape, Chinese Cabbage Hybrids, and Kale in the Eastern USA1

1986 · G. A. Jung, R. A. Byers, et al. · Agronomy Journal · 35

Uptake of a Hydrologic Tracer (Bromide) by Ryegrass from Well and Poorly‐Drained Soils

1995 · R. R. Schnabel, W. L. Stout, et al. · Journal of Environmental Quality · 32

Current European corn borer, Ostrinia nubilalis, injury levels in the northeastern United States and the value of Bt field corn

2013 · Eric W Bohnenblust, James A Breining, et al. · Pest Management Science · 26

Performance of Switchgrass and Bluestem Cultivars Mixed with Cool‐Season Species1

1985 · G. A. Jung, J. L. Griffin, et al. · Agronomy Journal · 25

Filter, inoculum and time effects on measurements of biodegradable water soluble organic carbon in soil

2002 · R.R. Schnabel, C.J. Dell, et al. · Soil Biology and Biochemistry · 20

Soil water conditions and yield of tall fescue, switchgrass, and Caucasian bluestem in the Appalachian Northeast

1986 · W. L. Stout, G. A. Jung, et al. · Journal of Soil and Water Conservation · 20

Denitrification Distributions in Four Valley and Ridge Riparian Ecosystems

1997 · RONALD R. SCHNABEL, JOHN A. SHAFFER, et al. · Environmental Management · 19

Estimation of Botanical Composition in Alfalfa/Ryegrass Mixtures by Near Infrared Spectroscopy

1990 · J. A. Shaffer, G. A. Jung, et al. · Agronomy Journal · 19

Sward Dynamics and Herbage Nutritional Value of Alfalfa‐Ryegrass Mixtures

1991 · G. A. Jung, J. A. Shaffer, et al. · Agronomy Journal · 16

Fall Management Effects on ‘Grasslands Matua’ Prairie Grass Production and Sward Characteristics

1994 · Gerald A. Jung, John A. Shaffer, et al. · Agronomy Journal · 14

Effect of temperature and water variables on the juvenile growth of lucerne and red clover

1994 · W. A. KENDALL, J. A. SHAFFER, et al. · Grass and Forage Science · 14

Root and shoot characteristics of prairie grass compared to tall fescue and smooth brome grass during establishment

1994 · J. A. Shaffer, G. A. Jung, et al. · New Zealand Journal of Agricultural Research · 12

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Planting Date and Seeding Rate Effects on Morphological Development and Yield of Turnip

1993 · G. A. Jung, J. A. Shaffer · Crop Science · 12

Quantitative effects of soil depth and soil and fertilizer nitrogen on nitrogen uptake by tall fescue and switchgrass

1991 · W.L. Stout, T.E. Staley, et al. · Communications in Soil Science and Plant Analysis · 12

Comparison of ‘Grasslands Puna’ Chicory and Orchardgrass for Multiple Harvests at Different Management Levels

2000 · Lisa A. Holden, Gabriella A. Varga, et al. · Agronomy Journal · 11

Planting and Harvest Date Effects on Productivity and Root/Shoot Quotient of Four Brassica Cultivars

1995 · Gerald A. Jung, John A. Shaffer · Agronomy Journal · 11

Harvest Frequency and Cultivar Influence on Yield and Protein of Alfalfa‐Ryegrass Mixtures

1996 · Gerald A. Jung, John A. Shaffer, et al. · Agronomy Journal · 10

Evaluating SPUR model for predicting animal gains and biomass on eastern hill land pastures

1990 · W.L. Stout, L.C. Vona, et al. · Agricultural Systems · 10

Harvest frequency effects on forage yield and quality of rapes and rape hybrids*

1988 · G. A. JUNG, J. A. SHAFFER, et al. · Grass and Forage Science · 10

Works count: 32

Citation count: 729

H-index: 15

I10-index: 25