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This article in AJ

  1. Vol. 82 No. 2, p. 295-301
     
    Received: Mar 15, 1989


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doi:10.2134/agronj1990.00021962008200020024x

Plant and Nitrogen Yield of Barley-Field Pea Intercrop in Cryoboreal-Subhumid Central Alberta

  1. R. C. Izaurralde ,
  2. N. G. Juma and
  3. W. B. McGill
  1. Dep. of Soil Science, Univ. of Alberta, Edmonton, Alberta, Canada T6G 2E3

Abstract

Abstract

Growing legumes with cereals may increase both yield and protein of livestock-feed crops as well as the quantity of N returned to soil. This study examined: (i) if barley-field pea intercropping has advantage over sole barley (Hordeum vulgare L.) for grain and N yield and (ii) the interactions between fertilizer N and seeding densities of barley and field pea (Pisum sativum L.). In 1986 and 1987, crop and N yields of barley and barley-pea were compared on a Malmo silt loam (Typic Cryoboroll) and a Breton loam (Typic Cryoboralf)- In 1987, fertilizer N (0 and 80 kg N ha−1) and seeding density (0, 86,172, 258 seeds m−2 of barley; and 0, 25, 50, 75 seeds m−2 of field pea) effects on intercrop yield were determined on the Malmo soil. In 1986, intercropped-barley yields at both sites were similar to sole crop yields due to low pea competition; but in 1987, they were 35 to 40% lower than sole crop yields. In three of four location-years, grain-N yield was higher in the intercrop than in sole barley. Nitrogen returned to soil in barley-pea residues was at least 22%higher than in barley straw. Of the intercrop components, only barley-straw yield increased when fertilized with 80 kg N ha−1. Peagrain yields were not affected by barley seeding rates; but barley yields decreased linearly when pea density increased from 0 to 75 seeds m−2. Fertilizer N did not interact with seeding densities of barley and pea. Area × Time Equivalent Ratios indicated an advantage of intercropping over sole cropping in N but not in plant yield. Barley-pea intercrops, each species seeded at half its sole rate, appear to increase N production in grain and straw over sole cropping under both soil-climate conditions.

Contribution from the Dep. Soil Science, Univ. of Alberta. Research supported by the Natural Sciences and Engineering Research Council (NSERC) of Canada.

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