AIR TEMPERATURE INSIDE THE CULTIVATION CHANNEL AND LETTUCE GROWTH AS A FUNCTION OF THE BENCH COVER MATERIAL ON THE NFT-HYDROPONICS SYSTEM
| Autor: | Maria Cristina Stolf Nogueira, Karen Maria Da Costa Mattos, Pedro Roberto Furlani, Luiz Roberto Angelocci |
|---|---|
| Jazyk: | angličtina |
| Rok vydání: | 2001 |
| Předmět: |
hidropônica
biology protected environment Materials Science (miscellaneous) Plastic sheet Fresh weight Mineralogy Lactuca hydroponics biology.organism_classification Hydroponics lcsh:S1-972 Horticulture Altitude Air temperature Environmental science Lactuca sativa L ambiente protegido lcsh:Agriculture (General) General Agricultural and Biological Sciences |
| Zdroj: | Bragantia, Vol 60, Iss 3, Pp 253-260 (2001) Bragantia v.60 n.3 2001 Bragantia Instituto Agronômico de Campinas (IAC) instacron:IAC Bragantia, Volume: 60, Issue: 3, Pages: 253-260, Published: 2001 |
| ISSN: | 1678-4499 0006-8705 |
| Popis: | Estudou-se o efeito de diferentes tipos de material de cobertura de mesas de cultivo hidropônico-NFT na temperatura do interior das canaletas e no crescimento da alface (Lactuca sativa L.), cv. Verônica. Em comparação ao tratamento-controle (tubos de polipropileno), utilizaram-se mantas de polietileno dupla face (branco e preto) e de Tetra-Pak®. O experimento foi realizado no Núcleo Experimental de Campinas, do Instituto Agronômico (22°54'S, 47°05'W, 674 m de altitude), usando-se mesas de cultivo com 24 m de comprimento, dividida em quatro blocos simétricos com os tratamentos distribuídos ao acaso. Sessenta termopares foram instalados no interior dos tubos para avaliar a temperatura interna do ar; armazenaram-se os sinais em um datalogger. Os valores medidos no interior dos tubos foram sempre superiores aos externos. Entretanto, nos tubos protegidos com Tetra-Pak®, os dados da temperatura interna do ar foram sempre de menor magnitude e, os de massa fresca de plantas de alface, superiores aos demais tratamentos. Essas diferenças foram estatisticamente significativas pelo teste de Tukey ao nível de 5%. No período noturno, nenhuma diferença de comportamento foi obtida entre os três tratamentos usados. This work was performed to study the effect of different types of covering material on the air temperature inside the cultivation channel and on the growth of lettuce (Lactuca sativa L.), plants cv. Verônica using closed NFT-hydroponics system. Two types of cover material were used: black and white double-faced plastic sheet and Tetra-Pak™. Uncovered polypropylene tubes were used as control. The experiment was carried out at Campinas Agronomic Experimental Station, São Paulo State, Brazil (22°54'S, 47°05'W, 674 m of altitude), using workbenches of 24 m long, divided in four symmetric blocks with treatments distributed at random. Sixty thermocouples were installed inside the tubes to measure the air temperature, being the signals collected by a datalogger. Air temperatures inside the cultivation channel were always higher than the outside. However, on the Tetra-Pak™ covered benches the values of temperature were lower and the fresh weight of the plants were higher in comparison to the double-faced plastic sheet and control treatments. These differences were statistically significant at P > 0.05 level. During the nighttime, the covering materials did not have any influence on the inside channel temperatures. |
| Databáze: | OpenAIRE |
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