Produção de alface americana em solo e em hidroponia, no inverno e verão, em Jaboticabal, SP

Abstract

Embora seja reconhecida como planta típica de clima temperado, a alface possui cultivares melhoradas geneticamente com maior tolerância às temperaturas elevadas, o que possibilita seu cultivo todo o ano. Objetivou-se, com o presente trabalho, avaliar a produção de seis cultivares de alface do grupo americana, cultivadas no solo e em hidroponia, nas estações de inverno e verão. Os experimentos foram conduzidos em casa de vegetação, na UNESP, Jaboticabal, SP. O delineamento experimental utilizado foi o de blocos casualizados, com três repetições. A produção de massa fresca e seca da parte aérea das cultivares estudadas foi influenciada pela época (inverno ou verão) mas não o foi pelo sistema de cultivo (solo ou hidroponia). O cultivo de verão determinou redução de 28% no acúmulo de massa fresca, constituindo-se em época marginal à produção de alface em Jaboticabal, SP, considerando-se os sistemas de cultivo empregados.

Hydroponic cultivation of Physalis angulata L.: growth and production under nitrogen doses1

“…It is important to point out that hydroponics accelerated the phenological phases of P. angulata and that, at 40 DAT, the plant already bore ripe fruits, while, in a study carried out by Tanan (2015) with the same species in the field, only flower buds were observed at 40 DAT. Early vegetable production in hydroponic cultivation was also reported by Feltrim et al (2005) and Bione et al (2014), which may be explained by the easy absorption of the nutrient solution and decrease in the energy released for N assimilation. (Figure 2b).…”

Effect of Cadmium on <i>Lactuca sativa</i> Grown in Hydroponic Culture Enriched with Phosphate Fertilizer

“…It is rich mainly in vitamins A and C and minerals such as iron and phosphorus [12]. In 2010, the world production of lettuce was approximately 24 million metric tons, with a cultivation area of 1 million hectares [13] [14].…”

“…The inert film acted as the support system for the lettuce plants, through which the roots of the plants pass to reach the nutrient solution underneath. Finally, the bins were randomly placed in a greenhouse of controlled temperature between 20°C and 23˚C as the ideal temperature for lettuce development is 23˚C [12], exposed to sunlight and artificially lit with numerous fluorescent lamps 24 hours a day, every day.…”

Growth of hydroponic lettuce with optimized mineral and organomineral nutrient solutions

“…Working with hydroponic system and solution of Furlani (1995), Feltrim et al (2005) obtained CD of 23.14 cm, on average, cultivating in the winter the cultivars Lorca, Lucy Brown, Tainá, Great Lakes, Madona and Mesa 659. On the other hand, in the summer season, Feltrim et al (2009) found mean of 24.34 cm for the following crisp lettuce cultivars: Marisa, Verônica, Veneza Roxa and Vera.…”