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Deep rooting of rainfed and irrigated orange trees in Brazil

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Fine roots of orange trees reached a depth of approx. 6 m in a sandy tropical soil. Root area index was more responsive to irrigation than leaf area index.

Abstract

Although the crucial role of deep rooting on the hydraulic functioning of tropical trees has been pointed out, studies dealing with root development below 2 m are still scarce. Our study aimed to gain insight into the fine root traits of rainfed and irrigated orange trees down to the root front in deep tropical soils. Irrigation was applied during dry periods, only 3–15% more than the annual amounts of water supplied by rain. Fine roots were sampled down to a depth of 8 m on four dates in a randomized block design. The effects of soil depth and irrigation on major fine root traits, total fine root length and the relationship between leaf area index (LAI) and root area index (RAI) were studied. The total fine root mass was 728 g m−2 in rainfed plots and 536 g m−2 in irrigated plots during the driest period (Sept/Oct 2012). Across the four sampling dates, the mean depth of the root front was 6.1 m in rainfed plots and 5.5 m in irrigated plots close to the trees, and approximately 4.5 m in the inter-row covered by Brachiaria decumbens plants. LAI was little influenced by irrigation (about 4.5 m2 m−2), but mean RAI was 19.1 m2 m−2 in rainfed plots and 13.7 m2 m−2 in irrigated plots. Small irrigation rates reduced root development in very deep soil layers, and increased fruit production by 9% during the dry year. Deep rooting provides access to water stored in deep soil layers during the rainy season, and thus might have an important functional role during dry periods in tropical orange orchards.

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Acknowledgements

We acknowledge the staff of the Itatinga Experimental Station (ESALQ-USP), in particular Rildo Moreira e Moreira, the staff of the Real Farm, as well as Floragro Apoio à Pesquisa (http://www.floragroapoio.com.br) for their technical support. The study was funded by FAPESP—Fundação de Amparo à Pesquisa do Estado de São Paulo (http://www.fapesp.br, 2012/03342-7).

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Authors and Affiliations

  1. Vegetal Production Department, Universidade Estadual Paulista ‘Júlio de Mesquita Filho’, Botucatu, SP, CEP 18610-300, Brazil

    Elisa Adriano

  2. CIRAD, UMR Eco&Sols, 2 Place Viala, 34060, Montpellier, France

    Jean-Paul Laclau

  3. Departamento de Solos e Recursos Ambientais, Universidade Estadual Paulista ‘Júlio de Mesquita Filho’, Botucatu, SP, CEP 18610-300, Brazil

    Jean-Paul Laclau

  4. Botany Department, Universidade Estadual Paulista ‘Júlio de Mesquita Filho’, Botucatu, SP, CEP 18618-970, Brazil

    João Domingos Rodrigues

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  1. Elisa Adriano
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Correspondence to Jean-Paul Laclau.

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Communicated by K. Noguchi.

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Adriano, E., Laclau, JP. & Rodrigues, J.D. Deep rooting of rainfed and irrigated orange trees in Brazil. Trees 31, 285–297 (2017). https://doi.org/10.1007/s00468-016-1483-5

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