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Germinação e formação de mudas de coqueiro irrigadas com águas salinas Germination and seedling formation of coconut irrigated with saline waters

By Francisco J. L. Marinho, Hans R. Gheyi and Pedro D. Fernandes

Abstract

O cultivo de coqueiro vem crescendo no Nordeste, com aumento de produtividade, quando irrigado. Sendo comuns na região águas salinas e se considerando a carência de dados de pesquisa de salinidade em coqueiro anão-verde (Cocos nucifera L.), objetivou-se, através deste trabalho, avaliar os efeitos da irrigação com águas salinas (CEa = 2,2, 5, 10, 15 e 20 dS m-1) sobre a germinação e o crescimento inicial de plântulas, até 120 dias após semeadura (fase I), estendendo-se a avaliação, posteriormente, após repicagem para o viveiro, quando passaram a ser irrigadas com água de CEa = 2,2 dS m-1, durante 120 dias (fase II), estudando-se o efeito residual dos níveis de salinidade aplicados na fase I. Em ambos os experimentos, o delineamento foi inteiramente casualizado, com quatro repetições. As águas salinas foram preparadas com adição de NaCl comercial. Na primeira fase, o incremento da CEa não influenciou significativamente a germinação que variou de 80 a 97,5%, porém afetou a velocidade de germinação e o crescimento das plântulas; na fase de sementeira, a salinidade afetou a fitomassa total a partir de 5,4 dS m-1; o sistema radicular foi a variável mais afetada pela salinidade. Na fase II, as plantas oriundas de germinação sob condições de alta salinidade, após passarem a ser irrigadas com água de 2,2 dS m-1, cresceram no mesmo ritmo daquelas germinadas sem estresse salino.<br>The coconut cultivation is growing in the Northeast Brazil with increase in productivity under irrigated conditions. Saline waters are commonly found in this region and considering the lack of data related to salinity on dwarf-green coconut (Cocos nucifera L.), this work had the objective of evaluating the effects of the irrigation with saline waters (ECw = 2.2, 5, 10, 15 and 20 dS m-1) on the germination and the initial growth of seedlings until 120 days after sowing (phase I), extending the evaluation, later, after transplanting in the nursery, when seedlings were irrigated with water of ECw = 2.2 dS m-1, for another 120 days (phase II), studying the residual effect of the applied salinity levels in the phase I. In both the experiments a completely randomized design was used with four replications. The saline waters were prepared with the addition of commercial NaCl. In the first phase, the increment of ECw did not influence the germination significantly, which varied from 80 to 97.5%, however, it affected the germination speed and the growth of the seedlings; in the germination phase the salinity affected the total phytomass starting from 5.4 dS m-1; the root system was the most affected variable by the water salinity. In the phase II, the plants germinated under conditions of high salinity when irrigated with water of 2.2 dS m-1 maintained the rhythm of growth similar to those germinated without saline stress

Topics: Cocos nucifera, estresse salino, fitomassa, Cocos nucifera, salinity stress, phytomass, Agriculture (General), S1-972, Agriculture, S, DOAJ:Agriculture (General), DOAJ:Agriculture and Food Sciences
Publisher: Universidade Federal de Campina Grande
Year: 2005
DOI identifier: 10.1590/S1415-43662005000300007
OAI identifier: oai:doaj.org/article:320519b796aa47e582a1db27fc1df0de
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