Open AccessProdutividade da alface americana submetida a diferentes lâminas de irrigação
Author(s) -
José Augusto de Freitas Lima,
Geraldo Magela Pereira,
Luciano Oliveira Geisenhoff,
Renato Carvalho Vilas Boas,
Wellington Gomes da Silva,
André Luiz Pereira da Silva
Publication year - 2012
Publication title -
semina. ciências agrárias
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.268
H-Index - 25
eISSN - 1679-0359
pISSN - 1676-546X
DOI - 10.5433/1679-0359.2012v33supl1p2681
Subject(s) - randomized block design , greenhouse , irrigation , horticulture , completely randomized design , environmental science , mathematics , yield (engineering) , zoology , agronomy , materials science , biology , metallurgy
With the aim of minimizing the difficulties faced by the producers on cultivating the crisphead lettuce (Lactuta sativa L), specifically those related to the lack of technical information about the quantity of water to be applied, a study was made in order to determine the effect of various water depths on crisphead lettuce yielding characteristics. The experiment was carried out at the Universidade Federal de Lavras (UFLA), from October to December 2008 in greenhouse. A randomized block design with five treatments and four repetitions was applied. The treatments, consisting of the five respective evaporation factors; , 0.30 EVm; 0.60 EVm; 0.90 EVm; 1.20 EVm; 1.50 EVm (evaporate depth), were done according to an evaporated depth of a reduced pan. The results showed that: The maximum commercial yield, 36.5 t ha(-1), was estimated by applying a 164.8 mm depth, which corresponded to a water reposition factor of 98 %; the highest water usage efficiency (962.45 kg ha(-1) mm(-1)) was attained when an irrigation depth of 50.10 mm (30%) was used