Desempenho de cultivares de alface na região de Manaus

Abstract

Performance of lettuce cultivars in Manaus regionIn the evaluation of vegetable cultivars, the high average yield in the competition assays associated to quality factors are utilized as criteria to recommend cultivars. In the present work we evaluated the lettuce cultivars Frisella, Deisy, Tender Green, Lollo Bionda, Itapuã 401, Marisa, Verônica, Banchu New Red Fire and Hortência under the climatic conditions of the region of Manaus, under protected and conventional cultivation. The evaluated characteristics were: total and commercial weight, plant diameter and height. The lettuce cultivars Marisa, Itapuã 401 and Hortência presented higher production in both environments adding Verônica with best production under conventional cultivation.

Productive and physiological performance of lettuce cultivars at different planting densities in the Brazilian Semi-arid region

“…Rodrigues et al (2008) also worked under conditions of high temperature in Manaus in the State of Amazonas, and observed a plant diameter of 13.6 cm in 'Crespa Lollo Bionda', similar to that found Mean values followed by the same lowercase letter in a column and uppercase letter on a line, do not differ by Scott-Knott test at 5% significance. in the present work for the same cultivar (14.06 cm).…”

“…This hypothesis may be strengthened by observing the results of net photosynthesis on these treatments, where plants of this cultivar, when grown at the spacing of 0.25 × 0.30 m, had the greatest rates for net photosynthesis, with a lower mean value seen at the spacing of 0.20 × 0.20 m. For Mondim (1989), larger spacings tend to give an increase in shoot fresh weight, mainly due to less competition between plants for light, water and nutrients. Rodrigues et al (2008) in Iranduba, Amazonas, and Santos et al (2009) Plants grown at larger spacings produced, on average, higher individual values for CFW and TFW. However, the smaller spacings were responsible for the largest average values for productivity, due to the larger number of plants per area.…”

Adaptação De Genótipos De Alface Crespa Em Condições Semiáridas

“…Ryder (1999) Considerando a forma de produção nacional de alface, nota-se a importância de se avaliar as cultivares em condições locais às quais serão plantadas em larga escala quanto à produtividade e características comerciais (RODRIGUES et al, 2008). Nesse contexto, objetivou-se avaliar o desempenho produtivo de cultivares de alface, do segmento varietal crespa, nas condições do Submédio do Vale do São Francisco.…”

Desempenho de cultivares de alface americana cultivadas com e sem mulching em período chuvoso da Amazônia

“…Temperaturas acima de 20 °C estimulam o seu pendoamento, que é acelerado à medida que esse fator climático aumenta, o que se torna mais crítico associado a dias longos (SANTI et al, 2010), resultando em colheita antecipada e plantas de baixa qualidade (ARAUJO et al, 2007;RODRIGUES et al, 2008). Na alface americana, o desenvolvimento ideal se dá em temperaturas na faixa de 15,5 a 28,3 °C (SANDERS, 1999;ARAÚJO et al, 2010).…”