Combination of fresh and brackish waters for hydroponic lettuce production

被引：28

作者：

Soares, Tales M. ^{[1
]}

Duarte, Sergio N. ^{[2
]}

Silva, Enio F. F. ^{[3
]}

Jorge, Cristiano A. ^{[2
]}

机构：

[1] CCAAB UFRB, BR-44380000 Cruz Das Almas, BA, Brazil

[2] LER ESALQ, BR-13418900 Piracicaba, SP, Brazil

[3] DTR UFRPE, BR-52171900 Recife, PE, Brazil

来源：

REVISTA BRASILEIRA DE ENGENHARIA AGRICOLA E AMBIENTAL | 2010年 / 14卷 / 07期

关键词：

salinity; soilless cultivation; vegetables; groundwaters; irrigation;

D O I：

10.1590/S1415-43662010000700004

中图分类号：

S2 [农业工程];

学科分类号：

0828 ;

摘要：

Plants of crisphead lettuce cv. Veronica were grown under hydroponic conditions aiming to evaluate two types of combination of brackish and fresh waters: using the brackish waters to prepare nutrient solution (NS) and fresh water to replace the evapotranspiration loss (ETc) (Experiment I) and using the fresh water to prepare NS and the brackish waters to replace the ETc loss (Experiment II). A research structure was built up with 40 experimental units which simulated the nutrient film technique (NFT). The levels of water salinity were 0.585; 1.17; 1.755; 2.925 and 4.095 g L-1 NaCl. The lettuce yield (fresh shoot matter) decreased 10.9 and 3.91% for each unit increase in water salinity (g L-1 NaCl) in Experiments I and II, respectively. According to results obtained with the two types of combination of fresh and brackish waters, the use of brackish waters to replace ETc loss may increase the lettuce yield in comparison to using these waters to prepare the NS.

引用

页码：705 / 714

页数：10

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