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Previous issue date: 2006-12-13 / The experiments were carried out in an experimental area of the Ponta Grossa State
University, Parana State, Brazil in winter (experiment 1) and spring (experiment 2) of
2005/2006, with the aim to evaluate the production of two crisphead lettuce (Lucy
Brown and Raider Plus) under five different environments of culture: thermo-reflective
screen (Aluminet 40%), diffusive screen (ChromatiNet 40%), natural environment,
low tunnel with polyethylene and under nonwowen protection (white polypropylene of
17 g/m2 grid). The experimental design for both experiments was a completely
randomized with four replications in a factorial scheme 5x2 (crop systems x cultivars).
For both the experiments where evaluated: the total, commercial head and outer
leaves fresh matter weight (BFT, BFCab and BFS- g/m2), and the outer leaves as
well as their total and marbetable head dry matter (BST and BSCab - g/m2). For
experiment 2 dry matter of the outer leaves, index of the foliar area of the outer
leaves (IAFS) and of the leaves of the commercial head (IAFCab) were also
evaluated. In the winter of Ponta Grossa, for both the cultivars, the crop systems qith
nonwowen protection and low tunnel it had an early harvest of 21 days. However, in
the spring, did not have difference in the cycle of the lettuce, independent of the
cultivar and the crop system. But, the commercial production were superior in relation
to the winter, possibly because of the more favorable climatic conditions for the
crisphead lettuce culture.
Keywords: Lactuca sativa, cultivars, protected cultivation, tunnel, polypropylene,
Aluminet, ChromatiNet / Estadual de Ponta Grossa, no inverno (experimento 1) e primavera (experimento 2)
de 2005/2006, com objetivo de avaliar a produção de duas cultivares de alface
americana (Lucy Brown e Raider Plus) sob cinco ambientes de cultivo: malha termorefletora
(Aluminet 40%), malha difusora (ChromatiNet 40%), ambiente natural, túnel
baixo com polietileno e agrotêxtil branco (17 g/m2 de gramatura). O delineamento
experimental para ambos os experimentos foi inteiramente casualizado, distribuídos
em esquema fatorial 5x2 (sistemas de cultivo x cultivares) com quatro repetições.
Para ambos os experimentos avaliaram-se: biomassa fresca total (BFT), biomassa
fresca da cabeça comercial (BFCab), biomassa fresca das folhas da “saia” (BFS),
biomassa seca da cabeça comercial (BSCab) e biomassa seca total (BST). Para o
experimento 2 avaliou-se também biomassa seca das folhas da saia (BSS), índice
de área foliar das folhas da “saia” (IAFS) e das folhas da cabeça comercial (IAFCab).
No inverno de Ponta Grossa, para ambas as cultivares, os sistemas de cultivo com
agrotêxtil e túnel apresentaram precocidade de 21 dias na colheita. Entretanto, na
primavera, não houve diferença entre o ciclo da alface, independente da cultivar e do
ambiente de cultivo. Porém, a produção comercial foi superior em relação ao
inverno, possivelmente devido às condições climáticas mais favoráveis a cultura da
alface americana.
| Identifer | oai:union.ndltd.org:IBICT/oai:tede2.uepg.br:prefix/2194 |
| Date | 13 December 2006 |
| Creators | Niesing, Priscila Cristina |
| Contributors | Otto, Rosana Fernandes, Reghin, Marie Yamamoto, Santos, Humberto da Silva |
| Publisher | UNIVERSIDADE ESTADUAL DE PONTA GROSSA, Programa de Pós-Graduação em Agronomia, UEPG, BR, Agricultura |
| Source Sets | IBICT Brazilian ETDs |
| Language | Portuguese |
| Detected Language | English |
| Type | info:eu-repo/semantics/publishedVersion, info:eu-repo/semantics/masterThesis |
| Format | application/pdf |
| Source | reponame:Biblioteca Digital de Teses e Dissertações da UEPG, instname:Universidade Estadual de Ponta Grossa, instacron:UEPG |
| Rights | info:eu-repo/semantics/openAccess |
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