ROOT DISTRIBUTION, NUTRIENT CONCENTRATION AND ACCUMULATION IN ‘GIGANTE’ CACTUS PEAR IRRIGATED WITH SALINE WATER

Varley Andrade Fonseca; Marcelo Rocha dos Santos; Sérgio Luiz Rodrigues Donato; João Abel da Silva; Cleiton Fernando Barbosa Brito

doi:10.1590/1983-21252022v35n222rc

Authors

Varley Andrade Fonseca Agriculture Sector, Instituto Federal de Educação, Ciência e Tecnologia Baiano, Guanambi, BA https://orcid.org/0000-0002-1562-2190
Marcelo Rocha dos Santos Agriculture Sector, Instituto Federal de Educação, Ciência e Tecnologia Baiano, Guanambi, BA https://orcid.org/0000-0003-0896-0359
Sérgio Luiz Rodrigues Donato Agriculture Sector, Instituto Federal de Educação, Ciência e Tecnologia Baiano, Guanambi, BA https://orcid.org/0000-0002-7719-4662
João Abel da Silva Agriculture Sector, Instituto Federal de Educação, Ciência e Tecnologia Baiano, Guanambi, BA https://orcid.org/0000-0001-5358-356X
Cleiton Fernando Barbosa Brito Agriculture Sector, Instituto Federal de Educação, Ciência e Tecnologia Baiano, Guanambi, BA https://orcid.org/0000-0001-9423-4980

DOI:

https://doi.org/10.1590/1983-21252022v35n222rc

Keywords:

Opuntia ficus-indica. Salinity. Nutrition.

Abstract

- In semiarid regions with greater climatic variability, including prolonged droughts and delayed rainy seasons, supplemental irrigation is critical to ensuring yields of forage cactus pear. The objective was to evaluate root distribution and nutrient concentration and accumulation in ‘Gigante’ forage cactus pear subjected to different irrigation regimes. Seven irrigation regimes were tested: no irrigation (rainfed); five liters of medium-salinity water, with an electrical conductivity (EC) of 0.75 dS m^-1, applied per linear meter every 15 days; 7% reference evapotranspiration (ETo) with a 15-d irrigation interval (II); 15% ETo with a 7-d II; 33% ETo with a 3-d II; 50% ETo with a 2-d II; and 100% ETo, irrigated daily — high-salinity water, EC of 3.6 dS m^-1, was used in the last five treatments. The treatments were laid out in a randomized block design with four replicates. Roots developed best in plants irrigated at 50% ETo with a 7-d II. Applying high-salinity water at 15% ETo with a 7-d irrigation interval promotes higher concentrations of P, Ca, Mg and S in cladodes of cactus pear. Applying high-salinity water at 33% ETo with a 3-d II promotes higher uptake/accumulation of P, Ca, Mg, S and Zn in cladodes of ‘Gigante’ forage cactus pear.

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Author Biography

Varley Andrade Fonseca , Agriculture Sector, Instituto Federal de Educação, Ciência e Tecnologia Baiano, Guanambi, BA

Departamento de Agronomia e área de ciência do solo

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