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Intercropping wheat and barley with N-fixing legume species: a method for improving ground cover, N-use efficiency and productivity in low input systems

  • M. P. Reynolds (a1), K. D. Sayre (a1) and H. E. Vivar (a2)

Two cereal cropping systems are described which, through the introduction of a leguminous intercrop, increased productivity, nitrogen output and ground cover of the systems in the absence of added nitrogen fertilizer. Nitrogen-fixing legumes were cultivated between rows of wheat or barley grown at low levels of soil nitrogen, and mostly under rainfed conditions, in Mexico between 1989 and 1992. None of the legumes tested reduced yields of the cereal crop in comparison to controls where cereal yields were in the range of 1–4 t/ha, while the extra total biomass from legumes in some cases more than doubled productivity. Different legume crops were tested to demonstrate the adaptability of the system to the varying needs of farmers. The intercropped legumes achieved dry biomass yields as high as 6·5 t/ha in the case of a sequentially cropped forage crop of hairy vetch, or 1·4 t/ha of dry beans plus 3·5 t/ha of green residue in the case of Vicia faba. Total biomass in the intercropped situation gave land equivalent ratios as high as 1·54. Light measurements inside the crop canopies indicated that the intercropped systems intercepted a higher proportion of the incident solar radiation than the cereal monocrop, presumably accounting for the large differences in total biomass produced. In addition, with leaf nitrogen levels of 3·8%, it is assumed that the intercropped legumes fixed considerably more nitrogen than was removed by the wheat crop. The potential of the system to stabilize erodible soils by increasing ground cover as well as by raising inputs of soil organic matteris discussed.

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R. H. Bray & L. T. Kurtz (1945). Determination of total organic and available forms of phosphorus in soils. Soil Science 59, 3945.

G. P. Gillman & E. A. Sumpter (1986). Modification to the compulsive exchange method for measuring exchange characteristics of soils. Australian Journal of Soil Research 24, 6166.

R. C. Izaurralde , N. G. Juma & W. B. McGill (1990). Plant and nitrogen yield of barley-field pea intercrop in cryoboreal-subhumid central Alberta. Agronomy Journal 82, 295301.

L. Jones & R. O. Clements (1993). Development of a low input system for growing wheat (Triticum vulgare) in a permanent understorey of white clover (Trifolium repens). Annals of Applied Biology 123, 109119.

S. C. Mason , D. E. Leihner & J. J. Vorst (1986). Cassava cowpea and cassava-peanut intercropping. III. Nutrient concentrations and removal. Agronomy Journal 78, 441444.

F. Ofori & W. R. Stern (1987). Cereal–legume intercropping systems. Advances in Agronomy 41, 4190.

J. S. Papadakis (1941). Small grains and winter legumes grown mixed for grain production. Journal of the American Society of Agronomy 33, 504511.

M. S. Reddy & R. W. Willey (1981). Growth and resource use studies in an intercrop of pearl millet/groundnut. Field Crops Research 4, 1324.

J. S. Tomar , A. F. MacKenzie , G. R. Mehuys & I. Alli (1988). Corn growth with foliar nitrogen, soil-applied nitrogen, and legume intercrops. Agronomy Journal 80, 802807.

C. van Kessel , P. W. Singleton & H. J. Hoben (1985). Enhanced N-transfer from a soybean to maize by vesicular arbuscular mycorrhizal (VAM) fungi. Plant Physiology 79, 562563.

A. Walkley (1947). A critical examination of a rapid method for determining organic carbon in soils: effect of variations in digestion conditions and of inorganic soil constituents. Soil Science 63, 251263.

F. S. Watanabe & S. R. Olsen (1965). Test of an ascorbic acid method for determining phosphorus in water and NaHCO3 extracts from soil. Soil Science Society of America Proceedings 29, 677678.

J. G. White & T. W. Scott (1991). Effects of perennial forage-legume living mulches on no-till winter wheat and rye. Field Crops Research 28, 135148.

J. C. Zadoks , T. T. Chang & C. F. Konzak (1974). A decimal code for the growth stages of cereals. Weed Research 14, 415421.

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The Journal of Agricultural Science
  • ISSN: 0021-8596
  • EISSN: 1469-5146
  • URL: /core/journals/journal-of-agricultural-science
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