Disponibilidade de água no solo para porta-enxertos de citros em ecossistema de tabuleiro costeiro

Abstract

À administração do Centro pelo apoio desde o início do curso em fevereiro de 1994. A Robson Oliveira pela ajuda inestimável em todas as fases do trabalho. Ao colega e pesquisador Roosevelt M. Prudente pela cessão do experimento de porta-enxerto. A José Roque de Jesus pela realização das filmagens das trincheiras. A Paulo Sérgio Santos da Mota pelo apoio durante a realização dos trabalhos no Campo Experimental de Umbaúba -CEU. Aos funcionários do CEU, Gilberto, Acácio, Raimundo e Milton pela dedicação com que executaram suas funções. Aos colegas pesquisadores do CP ATC Antônio Carlos Barreto, Evandro de A. Tupinambá e Maria de Lourdes da S Leal pelo apoio e colaboração.Ao pesquisador José Coelho A Filho pela descrição e análise morfológica do perfil. Ao Sr. Amâncio C. Santos pela ajuda na construção de vários equipamentos utilizados no trabalho de campo.-EMBRAPA-Instrumentação Agropecuária (CNPDIA):À administração do Centro pela cessão do Laboratório de imagens.A Lúcio André de Castro Jorge pela ajuda e orientação nos estudos sobre sistema radicular.A Ednaldo José Ferreira pela ajuda inestimável durante a aquisição e tratamento das imagens de raízes em computador.

Ability of Citrus Root System to Overcome a Strong Wax Layer

“…For instance, root distribution of five citrus rootstocks in a Gray Argisol of Coastal Tableland, [Volkamer lemon 'Palermo' and 'Catânia' (Citrus volkameriana Pasquale), 'Rangpur' lime (Citrus limonia Osbeck), 'Rough Florida' lemon (Citrus jambhiri Lush) and 'Cleopatra' mandarin (Citrus reshni Hort. ex Tan)], were spatially positioned on average 61% in the 0-0.20 m layer and 90% in the 0-0.40 m layer (Cintra et al, 1999). Similar results were obtained by Souza et al (2004), and Santana et al (2006), also in cohesive soils.…”

“…Cohesive horizons in soils of the Coastal Tablelands, with massive structure and hard to extremely hard consistency when dry, affect water dynamics and the distribution of roots, which are highly sensitive to the presence of cohesion (Souza et al, 2008). Consequently, the depth of the plant root system is reduced, by either the resistance to penetration (Silveira et al, 2010) aggravated by soil drying, or poor aeration (Cintra et al, 1999(Cintra et al, , 2000.…”

Root distribution of rootstocks for 'Tahiti' lime

“…In places where long drought periods occur, large root volume can be a negative characteristic. Cintra et al (1999; observed, in Northeastern Brazil, that the 'Cleopatra' mandarin and the 'Rough' lemon had large root systems, leading to accelerated use of the soil water stock and, consequently, to a longer period of hydric stress. However, studying 'Pera' orange trees, Cintra et al (2000) concluded that plant water loss depends also on leaf area and scion type.…”

“…In the case of citrus, rootstocks are responsible for important characteristics of the plants, like tolerance to hydric stress, to high soil acidity, and to high aluminium saturation (Pace & Araujo, 1986;. Performance of rootstocks in a certain environment is related to total volume, configuration, lateral distribution and depth of the root system (Cintra et al, 1999).…”

“…Growing rates, extension, distribution and total volume of roots consist fundamental information to improve management practices, such as local watering and tillage (Castle et al, 1989;Neves et al, 1998;Carvalho et al, 1999;Machado & Coelho, 2000). There are few studies on root systems of citrus rootstocks in Brazil, and most of the existing were performed in São Paulo (Montenegro, 1960;Vieira & Gomes, 1999), Rio de Janeiro (Pace & Araujo, 1986) and Sergipe (Cintra et al, 1999). This project characterizes the distribution of the root systems of six Citrus rootstocks under 'Tahiti' lime scions, considering chemical and physical aspects of a Typic Hapludox, in Northern State of Paraná, Brazil.…”