Knudsen, Marie Trydeman; Hauggaard-Nielsen, Henrik; Joernsgaard, Bjarne and Jensen, Erik Steen (2004) Comparison of interspecific competition and N use in pea–barley, faba bean–barley and lupin–barley intercrops grown at two temperate locations. Journal of Agricultural Science, 142 (6), pp. 617-627.
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Mixed intercropping of spring barley (Hordeum vulgare L.) with field pea (Pisum sativum L.), faba bean (Vicia faba var. minor L.) or narrow-leafed lupin (Lupinus angustifolius L.) was compared to sole cropping in two field experiments at different locations, on a sandy loam soil and a sandy soil, in Denmark in 2001.
Grain legumes were dominant in intercrops on the sandy loam soil, except for lupin, whereas barley was dominant in intercrops on the sandy soil site. Combined intercrop grain yields were comparable to grain yields of the respective sole cropped grain legume or sole cropped, fertilized barley on each soil site. On the sandy loam soil, pea-barley and faba bean-barley intercrops increased the proportion of plant N derived from N2 fixation in grain legumes and increased the barley grain N concentration (1.7–2.2 mg/g) compared to sole cropping. However, the later maturity of faba bean compared to barley caused problems at harvest. The grain N concentration of intercropped barley was increased where grain legumes were dominant intercrops and not on the sandy soil site. Lupin-barley intercrops did not show intercropping advantages to the same degree as faba bean and pea, but lupin constituted a more stable yield proportion of the combined intercrop yield over locations.
Furthermore, the study indicates that the natural level of 15N abundance at certain locations might not always be sufficient to ensure a reliable estimate of N2 fixation using the 15N natural abundance method.
|EPrint Type:||Journal paper|
|Keywords:||intercropping, pea, lupin, faba bean, barley, fixation, 15N stable isotope methodology|
|Subjects:||Crop husbandry > Crop combinations and interactions|
|Research affiliation:||Denmark > DARCOF II (2000-2005) > I. 5 (GENESIS) Production of grain legumes and cereals for animal feed|
|Deposited By:||Hauggaard-Nielsen, Senior Scientist, phD, Cand. agro Henrik|
|Deposited On:||08 Dec 2004|
|Last Modified:||02 Aug 2012 10:46|
|Refereed:||Peer-reviewed and accepted|
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