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Early-maturing annual legumes: an option for cover cropping in rainfed olive orchards

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Abstract

Cover cropping is a major challenge in the sustainable management of rainfed olive orchards. From a 5 year study (2009–2014), the effect of a mixture of early-maturing and self-reseeding annual legumes (Legs) grown as a cover crop in a rainfed olive orchard was compared with a cover of natural vegetation fertilized with 60 kg nitrogen (N) ha−1 year−1 (NV +N), and a cover of natural vegetation not fertilized (NV −N). The study took place in NE Portugal. The following were assessed: (1) the performance of the covers by measuring ground cover percentages, dry matter yields and N content in aboveground biomass; (2) the soil fertility through chemical and microbiological assays and by growing plants in pot experiments; and (3) the nutritional status of olive trees and olive yields. Legumes gave higher ground-cover percentages, produced more biomass and accumulated more N in shoots in comparison to natural vegetation, whether fertilized or not. The results showed intense biological activity [microbial carbon (C) and N, CO2–C evolved in a laboratory incubation, metabolic quotient, total culturable fungi and bacteria, and acid phosphatase activity] in the 0–10 cm soil layer of the treatments producing more biomass (Legs and NV +N). However, soil available N was greater in soil samples from the Legs plot. N recoveries by turnip (Brassica rapa var. rapa L.) and rye (Secale cereale L.) grown in pot experiments were 84.4 and 60.2 mg pot−1 in soil samples from the Legs treatment and 29.4 and 27.1 mg pot−1 and 14.2 and 13.6 mg pot−1, respectively in NV +N and NV −N plots. Sown legumes appeared less effective in increasing organic C than natural vegetation. Nevertheless, in the Legs plot the increase of easily mineralizable C was proportionally higher than the increase of total organic C, which may mean that a more reactive pool of organic C is created, which may reduce the turnover of organic C and N in the soil. In the 10–20 cm soil layer, total organic C was significantly lower in Legs (14.0 g kg−1) than in NV −N (22.1 g kg−1) and N +NV (25.2 g kg−1) treatments, likely due to a priming effect caused by mineral N coming from the surface layer. Two years after the trial started, the N nutritional status of the olive trees was significantly higher in Legs than in natural vegetation plots even when 60 kg N ha−1 year−1 was applied. The cumulative olive yields in NV −N and NV +N plots were only 58.6 and 77.7 % in comparison to those found in the Legs plot, if only the last four harvests were considered, which were those influenced by the ground-cover treatments (2010–2013).

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Acknowledgments

Supported by PRODER under the project OlivaTMAD – Rede Temática de Informação e Divulgação da Fileira Olivícola em Trás-os-Montes e Alto Douro - Medida 4.2.2.2. The authors also thank Rita Diz, Ana Veiga Pinto, David Cabral and José Rocha for laboratorial assistance.

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Authors and Affiliations

  1. Mountain Research Centre, Polytechnic Institute of Bragança, Campus de Santa Apolónia, Ap. 1172, 5301-855, Bragança, Portugal

    M. Ângelo Rodrigues, Ermelinda L. Pereira, Isabel Q. Ferreira, Sara Freitas & Margarida Arrobas

  2. Escola Superior de Desenvolvimento Rural, Universidade Eduardo Mondlane, Vilankulos, Mozambique

    Paulo Dimande

  3. CITAB, Universidade de Trás-os-e Alto Douro, Quinta de Prados, 5000-801, Vila Real, Portugal

    Carlos M. Correia & José Moutinho-Pereira

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  1. M. Ângelo Rodrigues
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Correspondence to M. Ângelo Rodrigues.

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Rodrigues, M.Â., Dimande, P., Pereira, E.L. et al. Early-maturing annual legumes: an option for cover cropping in rainfed olive orchards. Nutr Cycl Agroecosyst 103, 153–166 (2015). https://doi.org/10.1007/s10705-015-9730-5

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