Trees

, Volume 31, Issue 1, pp 285–297 | Cite as

Deep rooting of rainfed and irrigated orange trees in Brazil

  • Elisa Adriano
  • Jean-Paul Laclau
  • João Domingos Rodrigues
Original Article
First Online:
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Accepted:

Abstract

Key message

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.

Keywords

Deep roots Citrus Root density Root traits Tropical plantation 
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Notes

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).

Compliance with ethical standards

Conflict of interest

The authors declare that they have no conflict of interest.

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Copyright information

© Springer-Verlag Berlin Heidelberg 2016

Authors and Affiliations

  1. 1.Vegetal Production DepartmentUniversidade Estadual Paulista ‘Júlio de Mesquita Filho’BotucatuBrazil
  2. 2.CIRAD, UMR Eco&SolsMontpellierFrance
  3. 3.Departamento de Solos e Recursos AmbientaisUniversidade Estadual Paulista ‘Júlio de Mesquita Filho’BotucatuBrazil
  4. 4.Botany DepartmentUniversidade Estadual Paulista ‘Júlio de Mesquita Filho’BotucatuBrazil

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