Volume of polyethylene bags for development of papaya seedlings in protected environments

Abstract

The objective of this study was to test container of polyethylene bags and protected environments on the papaya seedlings production, from May to August of 2008, in Aquidauana state of Mato Grosso do Sul (MS), Brazil. Five bags of polyethylene were used: 7.5 cm x 11.5 cm, 205.9 cm³; 8.4 cm x 10.6 cm, 238.1cm³; 10.0 cm x 16.5 cm, 525.2 cm³; 12.0 cm x 12.0 cm, 550.0 cm³ and 15.0 cm x 21.5 cm, 1539.8 cm³. These containers were placed in three protected environments: greenhouse; screened nursery with Sombrite® and screened nursery with Aluminet®. Because there is no replication of growing environment, each one was considered an experiment. For each cultivation environment, it was adopted a completely randomized design with eight replications of two plants each. Initially, data were submitted to analysis of individual variance of the container (for each cultivation environment), then performing the evaluation of the residual mean squares and the combined analysis of these environments for comparison of protected environments. The greenhouse and nursery with thermal reflector screen produced the best seedlings. The bags of 15.0 x 21.5 cm produced the best papaya seedlings. The Dickson Quality Index pointed the nursery with screen of thermal reflector as the environment that produced the most vigorous seedlings, when using the best container.

Clones, substrates and environments for seedlings of rubber tree rootstocks

“…According to OLIVEIRA et al (2012), plant ambience aims to identify the best weather conditions on production area and get better seedlings, yields and productivities. FARIA et al (2013) reported that the use of structures to protect the seedlings is very important when they are well managed, providing high quality plants with better adaptation to the field. COSTA et al (2010) explain that the different greenhouse environments use mostly the shading screens and plastic film.…”

Análise de crescimento e parâmetros fisiológicos em mudas de Dipteryx alata Vogel

“…Antoniazzi et al (2013), ao trabalhar com mudas de cedro (Cedrela fissilis Vell.) constataram que mudas Faria et al (2013), testando o volume de sacos de polietileno no desenvolvimento de mudas de mamoeiro em ambientes protegidos verificou que as mudas produzidas em sacos de menor volume sofreu com restrição ao desenvolvimento radicular e consequentemente, houve menor taxa do crescimento de impulso, assim como a disponibilidade de nutrientes nesses recipientes, resultado semelhante aos encontrados por Carvalho Filho et al 2003 2013, afirmam que mudas de espécies florestais e frutíferas obtêm melhores médias para as características avaliadas em recipientes de maiores volumes, portanto, quanto maior o volume do recipiente, menor é o número de replante, podendo ser associado então ao maior volume de raízes, diminuindo prováveis efeitos de seca que podem atingir o experimento.…”

Reflective material on cultivation benches and rice straw over the substrate in papaya seedling production

“…En períodos de mayor precipitación, el invernadero, en comparación con las pantallas, permite plantas más grandes con mayor número de hojas (Costa et al, 2011). En un período de temperatura media, tanto el invernadero agrícola como la pantalla negra promueven plántulas de calidad para el grupo 'Sunrise Solo' (Faria et al, 2013). La pantalla de sombreado bajo la película de polietileno promueve una mayor velocidad de emergencia de plántulas de papaya del grupo 'Formosa' (Silva et al, 2013) y la pantalla de sombreado de 18 y 35% origina plántulas con mayor altura de planta, diámetro de tallo, materia seca y el índice de calidad de Dickson que la pantalla de sombreado de 0 y 50% (Salles et al, 2019).…”