Resumoo trabalho foi realizado com o objetivo de avaliar a resposta produtiva de duas cultivares de alface (vera e lídia), em três ambientes de cultivo (sob agrotêxtil branco, sob agrotêxtil natural e em ambiente aberto), no inverno/ primavera de 2005. os materiais de agrotêxtil branco e natural, ambos de polipropileno, tinham 17 e 15 g m -2 de gramatura respectivamente. utilizou-se o delineamento experimental de blocos casualizados, com os tratamentos dispostos em parcelas subdivididas, com quatro repetições. a testemunha foi constituída por parcela sem proteção das plantas com agrotêxtil (ambiente aberto). Foram avaliadas as produtividades total e comercial da cabeça, o número de folhas por cabeça, a porcentagem de folhas descartadas e o comprimento e a fitomassa seca do caule das plantas de alface. Para as características avaliadas verificou-se efeito significativo dos fatores de forma isolada. Embora não tenha sido constatada diferença significativa entre os tipos de agrotêxtil na produtividade, ambos os resultados com esses materiais foram superiores à testemunha, independentemente da cultivar. Para a época de inverno/primavera da região estudada, o uso de agrotêxtil de coloração branca ou natural é recomendável para as cultivares vera e lídia proporcionando aumento na biomassa fresca da cabeça comercial e melhor aproveitamento das folhas. palavras-chaves:Lactuca sativa l., polipropileno, gramatura. aBstRactYield ResPonse oF lettuCe undeR PRoteCt Cultivation with no woven FilMs the experiment was carried out with the aim of evaluate the yield response of two lettuce cultivars (vera and lídia), in three different cultivation environment (under white no woven row cover, under natural no woven row cover and in open environments), between winter and spring 2005. the white and natural no woven's materials (both polypropylene) present 17 and 15 g m -2 grammature, respectively. the experimental design was a randomized blocks, with the treatments arranged in split plot, with four replications. the control was composed by a plot of plants without the row cover protection (open environment). it were evaluated the total and commercial yield of lettuce crop, number of leaves, percentage of discarded leaves, the length and dry biomass of the stalk of the lettuce crops. There was significance effect of the factors in an isolated way, for all the features evaluated. Although the types of no woven did not present significant difference between no woven types to productivity, both results with these materials were higher than the control plots, regardless of the cultivars. For the winter/spring season, the use of no woven of white coloring or natural is recommended for lettuce cultivars vera and lídia providing an increase of the fresh biomass of the commercial head and better use of the leaves.
-Experiments were carried out in Ponta Grossa -PR, Brazil, in the winter and spring/summer periods with iceberg lettuces cultivars Lucy Brown and Raider Plus. The objectives were to assess the lettuce productive responses and the intensity of the microclimate modifications in five cropping systems as under shade nets Aluminet 40-O ® (AL) and ChromatiNet Vermelha ® 40 (CR), a low tunnel covered with transparent polyethylene (TU), direct cover white nonwoven (NW) and natural conditions (NT). A complete randomized design was used for both the experiments with five treatments placed in a 5x2 factorial arrangement (cropping systems x cultivars) and four replications. The photosynthetically active radiation and air temperature were monitored by installing probes in a datalogger system. In the winter both cultivars under NW and TU produced 21 days earlier compared to the other environments but they presented fresh commercial head similar to NT at the end of the cycle and superior to CR and AL. In the spring/summer there was no difference in the lettuce cycle regardless of the cultivar and the cropping systems. The Lucy Brown cultivar presented smaller sized heads for the winter cropping but did not differ from Raider Plus during the spring/summer. The mean air temperature of the air under NW was higher than in the other environments in both experiments. The use of the different covering materials reduced the photosynthetically active radiation available to the plant but did not prevent commercial head production of Iceberg lettuce.
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