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Reduced chemical input cropping systems in the southeastern United States. I. Effect of rotations, green manure crops and nitrogen fertilizer on crop yields

Published online by Cambridge University Press:  30 October 2009

Larry D. King  and
Marc Buchanan
Larry D. King
Affiliation:
Professor, Department of Soil Science, North Carolina State University, Raleigh, NC 27695-7619;
Marc Buchanan
Affiliation:
Assistant Professor, Board of Environmental Studies, University of California, Santa Cruz, CA 95064.
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Abstract

Interest in reducing purchased chemical inputs to reduce production costs and avoid possible environmental damage prompted this 7-year study. Two management systems, current management practices (CMP) and reduced chemical inputs (RCI), were evaluated for four crop sequences from 1985 through 1992: continuous grain sorghum; continuous corn; a 2-year rotation of corn and double-cropped winter wheat and soybean; and a 4-year rotation of corn, winter wheat/soybean, corn, and red clover hay (changed in 1989 to a 3-year rotation of corn, red clover hay, and wheat/soybean). No-till planting and recommended rates of fertilizer and pesticides were used in the CMP system. In the RCI system, N was supplied by a crimson clover green manure crop or the red clover in the rotation. Weed control was by chisel plowing, disking, and cultivation.

Crimson clover top growth accumulated from 70 to 180 kgN/ha, red clover from 77 to 130 kg N/ha. Rotating crops increased corn yield with CMP but not with RCI. lndry years, corn yields were low (less than 3000 kg/ha), corn did not respond to fertilizer N, and yields generally were higher with CMP than with RCI. With adequate rain, yield of all RCI treatments were the same as yield in CMP continuous corn receiving no fertilizer N. Johnsongrass competition was the main reason for low yields in the RCI treatments. Soybean yields were higher with CMP in 4 years and higher with RCI one year. Wheat and grain sorghum yields were higher with CMP than with RCI. A dramatic decline in johnsongrass in sorghum was noted in 1989, and several plots remained relatively free of johnsongrass through 1992.

Management decisions made during the experiment included the degree of input reduction in RCI; whether to either end or modify unproductive treatments; whether to use newly available varieties and pesticides; whether to suspend the experiment to eliminate johnsongrass; and how to add new treatments while retaining the original treatments.

Keywords

crop rotationcurrent management practice
Type
Articles
Information
American Journal of Alternative Agriculture , Volume 8 , Issue 2 , June 1993 , pp. 58 - 77
Copyright
Copyright © Cambridge University Press 1993

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References

1.Anderson, J.R., and Wagger, M.G. (eds). undated. Corn production systems in North Carolina. N.C. Agric. Extension Service, Raleigh.Google Scholar
2.Andrews, R.W., Peters, S.E., Janke, R.R., and Sahs, W.W.. 1990 Converting to sustainable farming systems. In Francis, C.A., Flora, C.B., and King, L.D. (eds). Sustainable Agriculture in Temperate Zones. John Wiley and Sons, New York, N.Y. pp. 281–313.Google Scholar
3.Bremner, J.M., and Mulvaney, C.S.. 1982 Nitrogen - total. In Page, A.L. (ed). Methods of Soil Analysis. Part 2. Chemical and Microbiological Properties. 2nd ed. Agronomy Monograph 9. Amer. Soc. Agronomy and Soil Sci. Soc. Amer., Madison, Wisconsin, pp. 595–641.Google Scholar
4.Crozier, C.R. 1992 Tracing nitrogen movement in North Carolina Piedmont corn production systems using N pool size analysis and 15N tracing. Ph.D. dissertation. N.C. State University, Raleigh.Google Scholar
5.Hanway, J.J., and Weber, C.R.. 1971a. Dry matter accumulation in eight soybean (Glycine max (L.) Merrill) varieties. Agronomy J. 63:227–230.Google Scholar
6.Hanway, J.J., and Weber, C.R.. 1971b. Accumulation of N, P and K by soybean (Glycine max (L.) Merrill) plants. Agronomy J. 63:406–408.CrossRefGoogle Scholar
7.Hargrove, W.L. 1986 Winter legumes as a nitrogen source for no-till grain sorghum. Agronomy J. 78:70–74.CrossRefGoogle Scholar
8.Kamprath, E.J., Broome, S.W., Raja, M.E., Tonapa, S., Baird, J.V., and Rice, J.C.. 1973 Nitrogen management, plant population and row width studies with corn. Tech. Bull. No. 217. North Carolina Agric. Exp. Sta., Raleigh.Google Scholar
9.Liebhardt, W.C., Andrews, R.W., Culik, M.N., Harwood, R.R., Janke, R.R., Radke, J.K., and Rieger-Schwartz, S.L.. 1989 Crop production during conversion from conventional to low-input methods. Agronomy J. 81:150–159.Google Scholar
10.Lockeretz, W., Shearer, G., Sweeney, S., Kuepper, G., Wanner, D., and Kohl, D.H.. 1980 Maize yields and soil nutrient levels with and without pesticides and standard commercial fertilizers. Agronomy J. 72:65–72.Google Scholar
11.Lockeretz, W., Shearer, G., and Kohl, D.H.. 1981 Organic farming in the Corn Belt. Science 211:540–547.Google Scholar
12.Moll, R.H., Kamprath, E.J., and Jackson, W.A.. 1987 Development of nitrogen-efficient prolific hybrids of maize. Crop Sci. 27:181–186.Google Scholar
13.National Research Council. 1989 Alternative Agriculture. Board on Agriculture. National Academy Press. Washington, D.C.Google Scholar
14.Olsen, S.R., and Somers, L.D.. 1982 Phosphorus. In Page, A.L. (ed). Methods of Soil Analysis. Part 2. Chemical and Microbiological Properties. 2nd ed. Agronomy Monograph 9. Amer. Soc. Agronomy and Soil Sci. Soc. Amer., Madison, Wisconsin, pp. 403–430.Google Scholar
15.Sahs, W.W., and Lesoing, G.. 1985 Crop rotations and manure versus agricultural chemicals in dryland grain production. J. Soil and Water Conservation 40:511–516.Google Scholar
16.Touchton, J.T., Gardner, W.A., Hargrove, W.L., and Duncan, R.R.. 1982 Reseeding crimson clover as a N source for no-tillage grain sorghum production. Agronomy J. 74:283–287.Google Scholar
17.U.S. Dept. of Agriculture. 1980 Report and Recommendations on Organic Farming. U.S. Govt. Printing Office, Washington, D.C.Google Scholar
18.Watson, D.D. (ed). 1986–1990 North Carolina Agricultural Statistics. North Carolina Dept. of Agriculture and U.S. Dept. of Agriculture, Raleigh.Google Scholar