Abstract
The production of coffee seedlings in the south and southeast regions of Brazil is constrained by eventual frosts. The protection of coffee seedlings, which are grown by the utilization of containers and plastic coverings, was evaluated in Londrina , State of Parana, during the winter of 2000. The utilized plastic coverings were composed of single and double layers of black and white polyethylene. The seedlings produced in both materials were also evaluated in cold chamber, in order to verify the vulnerability of root system. The temperatures of leaves and root system were monitored by thermocouples connected to a data logger. The results of this experiment showed that plastic coverings of double layers were efficient to protect the seedlings against low night temperature of leaves. The seedlings produced in containers showed lower temperatures in the roots, which suggests more susceptibility to frost damages. Therefore, a special caution must be taken with seedlings grown in containers during the winter, in order to avoid frost damages
Highlights
A produção de mudas sadias e vigorosas é o primeiro passo para a formação de uma lavoura cafeeira produtiva
Mudas em tubetes de polietileno rígido sob sombrite cobertas com polietileno branco trançado e polietileno preto; 7
No experimento conduzido na câmara fria, observa-se que as temperaturas das folhas tanto em tubetes como em saquinhos foram muito próximas entre si, para cada teste avaliado (Figura 2)
Summary
Foram realizados dois experimentos com mudas de café Coffea arabica L., cultivar Tupi, com 5 a 6 pares de folhas, um conduzido no viveiro e outro em câmara fria. Mudas em saquinhos plásticos de polietileno sob sombrite cobertas com polietileno preto; 3. Mudas em saquinhos plásticos de polietileno sob sombrite cobertas com polietileno branco trançado e polietileno preto; 4. Mudas em tubetes de polietileno rígido sob sombrite cobertas com polietileno branco trançado e polietileno preto; 7. Sobre as mudas foram colocadas armações de metal, idênticas à utilizadas nas bandejas de tubetes, para suportar as coberturas plásticas. No período de 24 de julho a 15 de agosto de 2000 foi monitorada a temperatura foliar de uma planta de cada tratamento, utilizando sensores termopares cobre-constatã fixados em contato com a face abaxial das folhas (Morais et al, 2002). Foi monitorada a temperatura de folha em 4 plantas de cada tratamento, colocando sensores de termopares cobre-constatã em contato com a face abaxial das folhas. Os resultados referem-se à média das quatro plantas monitoradas
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