Amosse, Camille; Jeuffroy, Marie-Helene; Mary, Bruno and David, Christophe (2014) Contribution of relay intercropping with legume cover crops on nitrogen dynamics in organic grain systems. Nutrient Cycling in Agroecosystems, pp. 1-14.
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Document available online at: https://hal.archives-ouvertes.fr/hal-01173353
Summary
Nitrogen (N) management is a key issue in livestock-free organic grain systems. Relay intercropping with a legume cover crop can be a useful technique for improving N availability when two cash crops are grown successively. We evaluated the benefits of four relay intercropped legumes (Medicago lupulina, Medicago sativa, Trifolium pratense and Trifolium repens) on N dynamics and their contribution to the associated and subsequent cash crops in six fields of organic farms located in South-East France. None of the relay intercropped legumes affected the N uptake of the associated winter wheat but all significantly increased the N uptake of the succeeding spring crop, either maize or spring wheat. The improvement of the N nutrition of the subsequent maize crop induced a 30 % increase in grain yield. All relay intercropped legumes enriched the soil-plant system in N through symbiotic fixation. From 71 to 96 % of the N contained in the shoots of the legumes in late autumn was derived from the atmosphere (Ndfa) and varied between 38 and 67 kg Ndfa ha(-1). Even if the cover crop is expected to limit N leaching during wintertime, the presence of relay intercropped legumes had no significant effect on N leaching during winter compared to the control.
EPrint Type: | Journal paper |
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Keywords: | Relay intercropping (en), Legume cover crop (en), Leaching (en), Nitrate (en), N uptake (en), Organic farming (en), isotopic fractionation (en), winter-wheat (en), agricultural system (en), undersown crop (en), living mulche (en), catch crop (en), rhizobial strain (en), n-2 fixation (en), corn following wheat (en), natural-abundance (en) |
Subjects: | "Organics" in general |
Research affiliation: | France > INRAe - Institut national de recherche pour l’agriculture, l’alimentation et l’environnement |
ISSN: | ISSN: 1385-1314 |
DOI: | 10.1007/s10705-013-9591-8 |
Project ID: | HAL-INRAe |
Deposited By: | PENVERN, Servane |
ID Code: | 41658 |
Deposited On: | 12 Aug 2021 10:37 |
Last Modified: | 12 Aug 2021 10:37 |
Document Language: | English |
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