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Intercropping and fertilization strategies to progress sustainability of organic cabbage and beetroot production

Shanmugam, Sindhuja; Hefner, M.; Labouriau, R.; Trinchera, Alessandra; Willekens, Koen and Kristensen, Hanne Lakkenborg (2022) Intercropping and fertilization strategies to progress sustainability of organic cabbage and beetroot production. European Journal of Agronomy, 140, pp. 1-14.

[thumbnail of Shanmugam et al 2022_EJA_Intercropping and fertilization of cabbage and beetroot.pdf] PDF - English

Document available online at: https://doi.org/10.1016/j.eja.2022.126590


Sustainably increasing organic vegetable crop productivity is needed to meet growing demands, considering replacement of conventional animal manures with alternative fertilizers. We investigated the effects of intercropping (IC) and different organic fertilization strategies, and their interactions, on the plant-soil system. A 2-year IC field experiment with white cabbage and beetroot was conducted with two compost-supplemented fertilization strategies (animal-based AF+C; plant-based PF+C) and one control with pig slurry (CONT). Root growth was measured with the minirhizotron method. Overall productivity of intercropping (IC) was lower or similar to that of monocropping (MC) systems with a land equivalent ratio of 0.8 in 2018 and 1.0 in 2019. IC affected rooting intensity in only few soil layers: at harvest (2018), beetroot IC had higher rooting intensity compared to beetroot MC in 0.25–0.75 m soil layer. Mycorrhizal colonization of beetroot roots was increased by 37 % under IC. CONT crops had the highest yield and nitrogen (N) accumulation in 2018. In 2019, yield, N and phosphorous (P) accumulation and soil enzyme activity were higher in the PF+C and CONT conditions than with AF+C. Potential N mineralization was 24–37 % higher under PF+C compared to CONT and AF+C, whereas hot water extractable P was highest under animal-based fertilization strategies (CONT: 8.66 mg kg−1, AF+C: 8.56 mg kg−1) compared to PF+C: 7.99 mg kg−1. Benefits of productivity and N-use-efficiency from complementary root growth and resource use were not found in cabbage-beetroot IC. Instead, displacement of sowing/planting dates in the second year decided the dominating species, supported by mycorrhiza in beetroot. This management practice reduced the level of competition and increased the overall productivity of the IC system compared to 2018. The plant-based fertilization strategy had higher soil fertility as indicated by potential N mineralization and similar P use efficiency and can replace pig slurry. The methods of IC and fertilization strategy interacted only on potential N mineralization. Long-term improvements are expected with compost-supplemented fertilization strategies owing to their high organic carbon and N inputs.

EPrint Type:Journal paper
Agrovoc keywords:
fertilisers -> fertilizers
vegetable crops
nitrogen balance
Subjects: Soil > Soil quality
Crop husbandry > Crop combinations and interactions
Crop husbandry > Composting and manuring
Soil > Nutrient turnover
Crop husbandry > Production systems > Vegetables
Environmental aspects
Research affiliation: Denmark > Organic RDD 4 > ClimateVeg
European Union > CORE Organic > CORE Organic Cofund > SUREVEG
Denmark > AU - Aarhus University > Faculty of Science and Technology > Department of Food Science
Denmark > GUDP
Denmark > Innovation Fund Denmark
European Union > CORE Organic > CORE Organic Cofund
European Union > Other projects, departments, etc.
Deposited By: Kristensen, Ph.D. Hanne Lakkenborg
ID Code:52153
Deposited On:21 Dec 2023 09:48
Last Modified:21 Dec 2023 09:48
Document Language:English
Refereed:Peer-reviewed and accepted

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