@article{mueller_barbercheck_bell_brownie_creamer_hitt_hu_king_linker_louws_et al._2002, title={Development and implementation of a long-term agricultural systems study: Challenges and opportunities}, volume={12}, number={3}, journal={HortTechnology}, author={Mueller, J. P. and Barbercheck, M. E. and Bell, M. and Brownie, C. and Creamer, N. G. and Hitt, A. and Hu, S. and King, L. and Linker, H. M. and Louws, F. J. and et al.}, year={2002}, pages={362–368} }
 @article{blum_king_brownie_2002, title={Effects of wheat residues on dicotyledonous weed emergence in a simulated no-till system}, volume={9}, number={2}, journal={Allelopathy Journal}, author={Blum, U. and King, L. D. and Brownie, C.}, year={2002}, pages={159–176} }
 @article{muriuki_king_volk_2001, title={Nitrogen-15 recovery in soil incubated with potassium nitrate and clover residues}, volume={65}, ISSN={["0361-5995"]}, DOI={10.2136/sssaj2001.6551430x}, abstractNote={In the southeastern USA, legumes are used as green manure to meet crop N requirements of a following crop, but recovery is usually lower than from conventional fertilizers. We conducted a laboratory study for 26 wk under aerobic conditions to monitor recovery of 15N‐labeled KNO3 (fertilizer) and crimson clover (Trifolium incarnatum L.) residues (clover) in organic, inorganic, and microbial biomass N pools. Volatilization of NH3 from decomposing clover residues was monitored for 12 wk. Three hundred–gram samples of a Typic Kanhapludult soil were amended with N (0.051 mg N kg−1 dry soil in fertilizer and 0.049 mg N kg−1 dry soil in clover). A control with no N was also included. Although inorganic N (NH4, NO2, and NO3) accumulated throughout (fertilizer > clover > control), the rate of accumulation did not differ among treatments. Organic and microbial biomass N concentration did not differ among treatments, but applied N recovery in microbial biomass was greater in clover than fertilizer (P < 0.05) throughout. Ammonia volatilized was negligible. After 26 wk, applied N recovered in soil inorganic N was 66% for fertilizer and 40% for clover; in soil organic N, 18% for fertilizer and 50% for clover; and in microbial biomass N, 0.75% for fertilizer and 1.5% for clover. Applied N presumed denitrified was 16% in fertilizer and 10% in clover. We concluded that clover green manure can meet the N requirements of a following crop from the time of emergence in the southeastern USA.}, number={5}, journal={SOIL SCIENCE SOCIETY OF AMERICA JOURNAL}, author={Muriuki, AW and King, LD and Volk, RJ}, year={2001}, pages={1430–1436} }
 @article{white_sheffield_washburn_king_green_2001, title={Spatial and time distribution of dairy cattle excreta in an intensive pasture system}, volume={30}, ISSN={["0047-2425"]}, DOI={10.2134/jeq2001.2180}, abstractNote={ABSTRACT}, number={6}, journal={JOURNAL OF ENVIRONMENTAL QUALITY}, author={White, SL and Sheffield, RE and Washburn, SP and King, LD and Green, JT}, year={2001}, pages={2180–2187} }
 @article{stolf_cassel_king_reichardt_1998, title={Measuring mechanical impedance in clayey gravelly soils}, volume={22}, DOI={10.1590/s0100-06831998000200003}, abstractNote={Mechanical impedance of clayey and gravelly soils is often needed to interpret experimental results from tillage and other field experiments. Its measurement is difficult with manual and hydraulic penetrometers, which often bend or break in such soils. The purpose of this study was to evaluate the feasibility of a hand-operated "Stolf" impact penetrometer to measure mechanical impedance (soil resistance). The research was conducted in Raleigh, North Carolina, USA (35º 45'N, 78º 42'W, elevation 75 m). Corn was planted on April 19, 1991. Penetrometer measurements were taken on May 10, 1991, in 5 cm intervals to 60 cm at 33 locations on a transect perpendicular to the corn rows in each of four tillage treatments. The data permitted three-dimensional displays showing how mechanical impedance changed with depth and distance along the transect. The impact penetrometer proved to be a useful tool to collect quantitative mechanical impedance data on "hard" clayey and/or gravelly soils which previously were difficult to reliably quantify.}, number={1998}, journal={Revista Brasileira De Ciencia Do Solo}, author={Stolf, R. and Cassel, D. K. and King, L. D. and Reichardt, K.}, year={1998}, pages={189–196} }
 @article{king_hoag_1998, title={Reduced chemical input cropping systems in the southeastern United States. III, Economic analysis}, volume={13}, DOI={10.1017/s088918930000758x}, abstractNote={Abstract}, number={1}, journal={American Journal of Alternative Agriculture}, author={King, L. D. and Hoag, D.}, year={1998}, pages={12–27} }
 @article{crozier_king_volk_1998, title={Tracing nitrogen movement in corn production systems in the North Carolina Piedmont: A nitrogen-15 study}, volume={90}, ISSN={["0002-1962"]}, DOI={10.2134/agronj1998.00021962009000020009x}, abstractNote={Abstract}, number={2}, journal={AGRONOMY JOURNAL}, author={Crozier, CR and King, LD and Volk, RJ}, year={1998}, pages={171–177} }
 @article{blum_king_gerig_lehman_worsham_1997, title={Effects of clover and small grain cover crops and tillage techniques on seedling emergence of dicotyledonous weed species}, volume={12}, DOI={10.1017/s0889189300007487}, abstractNote={Abstract}, number={4}, journal={American Journal of Alternative Agriculture}, author={Blum, Udo and King, L. D. and Gerig, T. M. and Lehman, M. E. and Worsham, A. D.}, year={1997}, pages={146–161} }
 @article{miner_gutierrez_king_1997, title={Soil factors affecting plant concentrations of cadmium, copper, and zinc on sludge-amended soils}, volume={26}, ISSN={["0047-2425"]}, DOI={10.2134/jeq1997.00472425002600040009x}, abstractNote={Establishment of maximum cumulative metal loading rates of sludge require metals in soils be related to metal concentrations in plants grown on those soils. The relationship between plant concentrations of Cd, Cu, and Zn and soil properties on sites of long-term municipal sludge application were evaluated. Swiss chard (Beta vulgaris L.) and lettuce (Lactuca sativa L.) were planted on five fields (Typic Hapludults) with known sludge disposal history. After harvest, tobacco (Nicotina tabacum L.) following swiss chard and peanut (Arachis hypogea L.) following lettuce were planted in the same plots. Extractable Cd, Cu, and Zn (Mehlich-3, 0.05 M DTPA, 0.05 M EDTA), clay, humic matter, organic C, and pH were determined on a composite 20-cm depth soil sample and Mehlich-3 extractable metals were determined by 15-cm increments on a 60-cm depth sample from each plot. Tissue concentrations of Cd, Cu, and Zn were measured near harvest maturity (swiss chard and lettuce) or shortly after anthesis (tobacco and peanut). Simple linear regressions were poor between plant metal concentration and soil-extractable metal for all extractants. Inclusion of soil properties in the best-fit multivariate regression models improved the relationship for metal concentration in plants. Values for R 2 ranged from 0.30 to 0.96 with the poorest correlations obtained for Cu in lettuce and peanut. Best-fit models for all other crop-extractant-metal combinations had R 2 > 0.83. Metals extracted by the three extractants were correlated with each other so their inclusion in models describing plant concentrations of heavy metal in this study gave similar results.}, number={4}, journal={JOURNAL OF ENVIRONMENTAL QUALITY}, author={Miner, GS and Gutierrez, R and King, LD}, year={1997}, pages={989–994} }
 @article{king_1994, title={Reduced chemical input cropping systems in the southeastern United States. II. Effects of moderate rates of N fertilizer and herbicides, tillage, and delayed cover plow-down on crop yields}, volume={9}, DOI={10.1017/s0889189300005920}, abstractNote={Abstract}, number={4}, journal={American Journal of Alternative Agriculture}, author={King, L. D.}, year={1994}, pages={162} }
 @article{king_buchanan_1993, title={Reduced chemical input cropping systems in the southeastern United States. I. Effect of rotations, green manure crops and nitrogen fertilizer on crop yields}, volume={8}, DOI={10.1017/s0889189300004999}, abstractNote={Abstract}, number={2}, journal={American Journal of Alternative Agriculture}, author={King, L. D. and Buchanan, M.}, year={1993}, pages={58} }
 @article{king_hajjar_1990, title={THE RESIDUAL EFFECT OF SEWAGE-SLUDGE ON HEAVY-METAL CONTENT OF TOBACCO AND PEANUT}, volume={19}, ISSN={["1537-2537"]}, DOI={10.2134/jeq1990.00472425001900040018x}, abstractNote={Abstract}, number={4}, journal={JOURNAL OF ENVIRONMENTAL QUALITY}, author={KING, LD and HAJJAR, LM}, year={1990}, pages={738–748} }
 @article{king_dunlop_1982, title={APPLICATION OF SEWAGE-SLUDGE TO SOILS HIGH IN ORGANIC-MATTER}, volume={11}, ISSN={["0047-2425"]}, DOI={10.2134/jeq1982.00472425001100040011x}, abstractNote={Abstract}, number={4}, journal={JOURNAL OF ENVIRONMENTAL QUALITY}, author={KING, LD and DUNLOP, WR}, year={1982}, pages={608–616} }
 @article{king_1982, title={LAND APPLICATION OF UNTREATED INDUSTRIAL-WASTE WATER}, volume={11}, ISSN={["0047-2425"]}, DOI={10.2134/jeq1982.00472425001100040016x}, abstractNote={Abstract}, number={4}, journal={JOURNAL OF ENVIRONMENTAL QUALITY}, author={KING, LD}, year={1982}, pages={638–644} }