SciELO - Scientific Electronic Library Online

 
vol.35 issue1Effects of boron on sugar cane cultivated in six soils of Piracicaba county: I. plant cropEvaluation of assimilable boron and response tests to this element by the sunflower biological method in soils cultivated with sugar cane author indexsubject indexarticles search
Home Pagealphabetic serial listing  

Services on Demand

Journal

Article

Indicators

Related links

Share


Bragantia

Print version ISSN 0006-8705On-line version ISSN 1678-4499

Bragantia vol.35 no.1 Campinas  1976

http://dx.doi.org/10.1590/S0006-87051976000100019 

Temperatura-base para alface cultivar "white boston", em um sistema de unidades térmicas

 

Base temperature for lettuce in a heat-unit system

 

 

O. BruniniI, *; R. S. LisbãoII; J. B. Bernar-DIII, *; J. B. FornasierII, *; M. J. Pedro JúniorIII, *

ISeção de Climatologia Agrícola
IISeção de Hortaliças Diversas
IIISeção de Climatologia Agrícola, Instituto Agronômico

 

 


SINOPSE

Através de um sistema de unidades térmicas, estudou-se o efeito da temperatura média do ar sobre o desenvolvimento de alface (Lactuca sativa L.), cultivar "white boston".
Os resultados evidenciaram que a temperatura-base de desenvolvimento dessa hortaliça varia com o estádio de desenvolvimento da cultura, sendo igual a 6°C para a fase germinação-transplante, e 10ºC para a fase transplante-colheita.
Observou-se que o desenvolvimento da planta em função da temperatura média do ar não é linear, pois atinge um máximo em torno de 22°C e após isso a taxa do desenvolvimento é decrescente.


SUMMARY

The effect of mean air temperature on the development of lettuce (Lactuca sativa L.) variety White Boston was determined in a heat-unit system.
The results showed that the base temperature is function of the stage of development of the crop. The base temperature for the phase: emergence-transplant was 6°C and for the phase transplant-harvest was 10°C.
It was observed that there is not a linear relationship between crop development and mean air temperature because the growth rate had a maximum at 22°C and it decreased after this value.


 

 

Texto completo disponível apenas em PDF.

Full text available only in PDF format.

 

 

LITERATURA CITADA

1. ALLISON, J. C. S. Use of the day-degree summation technique for specifying flowering times of maize varieties at different localities in Southern Africa. Rhod. J. agr. Res. 1:22-28, 1963.         [ Links ]

2. ARNOLD, C. Y. The determination and significance of the base temperature in a linear heat unit system. J. Am. Soc. hort. Sci. 74:430-445, 1959.         [ Links ]

3. CASSERES, E. Produccion de hortalizas. Lima, Peru, Instituto Interamericano de Ciências Agrícolas de La OEA, 1966. p.126-127.         [ Links ]

4. HOLMES, R. M. & ROBERTSON, G. W. Heat units and crop growth. Ottawa, Canada Department of Agriculture, 1959. 35p.         [ Links ]

5. KATZ, Y. H. The relationship between heat unit accumulation and the planting and harvesting of canning peas. J. Am. Soc. Agron. 44:74-78, 1952.         [ Links ]

6. KNOTT, J. E. Handbook for vegetable growers. New York, John Wiley, 1957. 238p.         [ Links ]

7. LANA, E. P. & AABOR, E. S. The value of the degree-hour summation system for estimating planting schedules and harvest dates with sweet corn in Iowa. Iowa State College J. Sci. 26(1):99-109, 1951.         [ Links ]

8. LINDSEY, A. A. & NEWMAN, J. E. Use of official weather data in spring time. Temperature analysis of an Indiana phenological record. Ecology 37(4):812-823, 1956.         [ Links ]

9. NUTTONSON, M. Y. Wheat-climate relationships and the use of phenology in ascertaining the thermal and photo-thermal requirements of wheat. Washington, Amer. Inst, of Crop Ecology, 1955. 388p.         [ Links ]

10. VALLI, V. J. Biometeorological factors as predictors of agronomic maturity of peanuts. AGMET, 1965 (Technical Note 6)        [ Links ]

11. WANG, J. Y. A critique of the heat unit approach to plant response studies. Ecology 41(4):785-790, 1960.         [ Links ]

12. WANG, J. Y. The influence of seasonal temperature ranges on pea production. J. Am. Soc. hort. Sci. 80:436-448, 1961.         [ Links ]

13. WARNOCK, S. J. & ISAACS, R. L. A linear heat unit system for tomatoes in California. J. Am. Soc. hort. Sci. 94(6):677-678, 1969.         [ Links ]

 

 

Recebido para publicação em 12 de janeiro de 1976.

 

 

* Com bolsa de suplementação do C.N.Pq.

Creative Commons License All the contents of this journal, except where otherwise noted, is licensed under a Creative Commons Attribution License