Acúmulo de nutrientes por cultivares de alface em cultivo hidropônico no inverno

Abstract

Nutrient accumulation by lettuce cultivars under hydroponic culture in the winterThe performance of six lettuce cultivars of the American group, under hydroponic system "NFT" was evaluated in Marechal Cândido Rondon, Paraná State, Brazil. The experiment was performed from June to August 2001, in randomized blocks designed, with four replication and six treatments, constituted by cultivars Lorca, Tainá, Havem, Empire 2000, Lucy Brown and Kaesar. Yield of fresh mass and dry matter of the shoot, concentration and accumulation of macro and micronutrients were evaluated. 'Lorca' and 'Havem' presented larger production of fresh matter. These cultivars presented smaller concentration of Ca and Cu in relation to the others cultivars. The concentration of nutrients in the shoot was not different among cultivars for N, P, K and Mn. For Ca, Mg, Cu and Zn, bigger variation in the concentration was observed. No statistical difference was observed among cultivars for the extraction of N and P, while for the other evaluated nutrients, the cultivars Lorca, Havem and Empire 2000 were superior, being also the ones which produced more fresh and dry matter.

Crescimento de alface hidropônica sob diferentes intervalos de irrigação

“…Casaroli et al (2003), em cultivos nos meses de março a abril, obtiveram 334,6 g para a cultivar Regina, cultivada com 15 minutos entre as irrigações, enquanto que Lopes et al (2003) relatam 450,7 g para a cultivar Lucy Brown, com 10 minutos entre irrigações, em cultivo hidropônico de inverno. Assim, é possível observar que os nossos dados de produção de massa fresca foram consideravelmente inferiores aos relatados na literatura.…”

Monitoring, calibration and maintenance of optimized nutrient solutions in curly lettuce (Lactuca sativa, L.) hydroponic cultivation

“…In the hydroponic cultivation, roots received a balanced nutrient solution that contains water and all nutrients necessary for plant development (Barbieri et al, 2010). Compared with the conventional cultivation, the hydroponic system has advantages for the consumer, producer and environment, generating products with high quality, short cycle, higher yield, less use of water, agricultural inputs and labor (Paulus et al, 2012;Lopes et al, 2003). The NFT system is basically composed of a tank of nutrient solution, a pumping system, two cultivation channels and a system of return to the tank.…”

Manejo De Água Para Produção De Alface Em Ambiente Protegido

“…Apresenta elevados teores de vitaminas, destacando-se seu teor de vitamina A (LOPES et al, 2003) e de sais minerais, indispensáveis na dieta alimentar, além de possuir baixo teor de calorias, aconselhável nas dietas por ser de fácil digestão .…”