Avaliação de cultivares de alface crespa produzidas em - Unesp
Avaliação de cultivares de alface crespa produzidas em - Unesp
Avaliação de cultivares de alface crespa produzidas em - Unesp
Create successful ePaper yourself
Turn your PDF publications into a flip-book with our unique Google optimized e-Paper software.
xi<br />
Palavras-chave: ambientes, <strong>cultivares</strong>, cultivo s<strong>em</strong> solo, Lactuca sativa L.,<br />
sist<strong>em</strong>a hidropônico-NFT<br />
EVALUATING CRISPY LETTUCE CULTIVARS PRODUCED UNDER THE NFT-<br />
HYDROPONIC SYSTEM IN TWO TYPES OF ENVIRONMENTALS IN RIBEIRÃO<br />
PRETO, STATE OF SÃO PAULO, BRAZIL<br />
SUMMARY - Due to changes in feeding habits, lettuce consumption has<br />
been increasing and must be supplied daily throughout the year. As a result, many<br />
producers have adopted hydroponics’ cultivation. In spite of this, many cultivars are<br />
not yet adapted to this technology. The objective of this study was to evaluate the<br />
performance of five lettuce cultivars grown in two environmentals in NFT (“Nutrient<br />
Film Technique”) hydroponic syst<strong>em</strong> in the period from Feb/06 to Apr/07 2006 in<br />
Ribeirão Preto, state of São Paulo, Brazil. To accomplish this, cultivars Pira Roxa,<br />
Pira Vermelha, Locarno, Crespona gigante, and Verônica were evaluated in<br />
conventional and climatizated greenhouse in the NFT syst<strong>em</strong>. A randomized-block<br />
experimental <strong>de</strong>sign was used, consisting of five cultivars in three blocks. Harvest<br />
was performed 61 days after seeding. Evaluations were ma<strong>de</strong> for fresh and dry<br />
mass of the aerial part, st<strong>em</strong>, and roots; number of leaves larger than 10 cm; and<br />
total number of leaves. Cultivar Crespona gigante in fresh weight and dry matter of<br />
the aerial part did not differ from cultivar Verônica, but it was superior to th<strong>em</strong><br />
cultivars Pira Roxa, Pira Vermelha and Locarno.The cultivars Pira Roxa and Pira<br />
Vermelha suggested a better adaptation, showing better resistance to bolting.<br />
There was no significant effect of the cultivars × environments interaction,<br />
<strong>de</strong>monstrating that the cultivars had similar behaviors in both environments. There<br />
was a larger consumption of water by the lettuce plants un<strong>de</strong>r the conventional<br />
greenhouse conditions in comparison to the acclimated one, probably due to their<br />
higher t<strong>em</strong>peratures and lower air relative humidities. The extraction of nutrients by<br />
leaves lettuce plants (average five to cultivate) obeyed to the followed the<br />
<strong>de</strong>creasing or<strong>de</strong>r: K>N>Ca>Mg>P>S>Fe>Mn>Zn>Cu.