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The performance of organic and conventional cropping systems in an extreme climate year

  • D.W. Letter (a1), R. Seidel (a1) and W. Liebhardt (a1)
Abstract
Abstract

The 1999 severe crop season drought in the northeastern US was followed by hurricane-driven torrential rains in September, offering a unique opportunity to observe how managed and natural systems respond to climate-related stress. The Rodale Institute Farming Systems Trial has been operating since 1981 and consists of three replicated cropping systems, one organic manure based (MNR), one organic legume based (LEG) and a conventional system (CNV). The MNR system consists of a 5-year maize–soybean–wheat–clover/hay rotation, the LEG of a 3-year maize–soybean–wheat–green manure, and the CNV of a 5-year maize-soybean rotation. Subsoil lysimeters allowed quantification of percolated water in each system. Average maize and soybean yields were similar in all three systems over the post-transition years (1985–1998). Five drought years occurred between 1984 and 1998 and in four of them the organic maize outyielded the CNV by significant margins. In 1999 all crop systems suffered severe yield depressions; however, there were substantial yield differences between systems. Organic maize yielded 38% and 137% relative to CNV in the LEG and MNR treatments, respectively, and 196% and 152% relative to CNV in the soybean plots. The primary mechanism of the higher yield of the MNR and LEG is proposed to be the higher water-holding capacity of the soils in those treatments, while the lower yield of the LEG maize was due to weed competition in that particular year and treatment. Soils in the organic plots captured more water and retained more of it in the crop root zone than in the CNV treatment. Water capture in the organic plots was approximately 100% higher than in CNV plots during September's torrential rains.

Copyright
Corresponding author
R. Seide (rita.seidel@rodaleinst.org).
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M.S. Clark , H. Ferris , K. Klonsky , W.T. Lanini , A.H.C. van Bruggen , and F.G. Zalom . 1998. Agronomic, economic, and environmental comparison of pest management in conventional and alternative tomato and corn systems in northern California. Agriculture Ecosystems and Environment 68 (1–2):5171.

J.F. Dormaar , C.W. Lindwall , and G.C. Kozub . 1988. Effectiveness of manure and commercial fertilizer in restoring productivity of an artificially eroded dark brown chermozemic soil under dryland conditions. Canadian Journal of Soil Science 68:669679.

L.E. Drinkwater , O.K. Letourneau , F. Workneh , A.H.C. Vanbruggen , and C. Shennan . 1995. Fundamental differences between conventional and organic tomato agroecosystems in California. Ecological Applications 5(4):10981112.

W.R. Eason , J. Scullion , and E.P. Scott . 1999. Soil parameters and plant responses associated with arbuscular mycorrhizas from contrasting grassland management regimes. Agriculture Ecosystems and Environment 73(3):245255.

R.A. Gerhardt 1997. A comparative analysis of the effects of organic and conventional farming systems on soil structure. Biological Agriculture and Horticulture 14(2):139157.

M.A. Liebig , and J.W. Doran . 1999. Impact of organic production practices on soil quality indicators. Journal of Environmental Quality 28(5): 16011609.

W. Lockeretz , G. Shearer , and D.H. Kohl . 1981. Organic farming in the Corn Belt. Science 211:540546.

L. Lohr , and L. Salomonsson . 2000. Conversion subsidies for organic production: results from Sweden and lessons for the United States. Agricultural Economics 22(2): 133146.

D.W. Lotter 2003. Organic agriculture. Journal of Sustainable Agriculture 21(4).

J.W. Moyer , L.S. Saporito , and R.R. Janke . 1996. Design, construction, and installation of an intact soil core lysimeter. Agronomy Journal 88:253256.

J.P. Reganold , A.S. Palmer , J.C. Lockhart , and A.N. Macgregor . 1993. Soil quality and financial performance of biodynamic and conventional farms in New Zealand. Science 260(5106):344349.

J.P. Reganold , J.D. Glover , P.K. Andrews , and H.R. Hinman . 2001. Sustainability of three apple production systems. Nature 410(6831):926930.

M.H. Ryan , G.A. Chilvers , and D.C. Dumaresq . 1994. Colonisation of wheat by VA-mycorrhizal fungi was found to be higher on a farm managed in an organic manner than on a conventional neighbour. Plant and Soil 160(1):3340.

G. Stanhill 1990. The comparative productivity of organic agriculture. Agriculture Ecosystems and Environment 30 (1–2): 126.

H. Weiss , and R.S. Bradley . 2001. What drives societal collapse? Science 291(5506):988.

A.T. Wells , K.Y. Chan , and P.S. Cornish . 2000. Comparison of conventional and alternative vegetable farming systems on the properties of a yellow earth in New South Wales. Agriculture Ecosystems and Environment 80(1–2):4760.

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American Journal of Alternative Agriculture
  • ISSN: 0889-1893
  • EISSN: 1478-5498
  • URL: /core/journals/american-journal-of-alternative-agriculture
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