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

Brunini, O.; Lisbão, R. S.; Bernar-DI, J. B.; Fornasier, J. B.; Pedro Júnior, M. J.

doi:10.1590/S0006-87051976000100019

Resumos

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.

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.

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

Base temperature for lettuce in a heat-unit system

O. Brunini^I,^*; R. S. Lisbão^II; J. B. Bernar-DIII, ^{^*}; J. B. Fornasier^II,^*; M. J. Pedro Júnior^III,^*

^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.

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LITERATURA CITADA

Recebido para publicação em 12 de janeiro de 1976.

Referências bibliográficas

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.
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.
3. CASSERES, E. Produccion de hortalizas. Lima, Peru, Instituto Interamericano de Ciências Agrícolas de La OEA, 1966. p.126-127.
4. HOLMES, R. M. & ROBERTSON, G. W. Heat units and crop growth. Ottawa, Canada Department of Agriculture, 1959. 35p.
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.
6. KNOTT, J. E. Handbook for vegetable growers. New York, John Wiley, 1957. 238p.
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.
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.
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.
10. VALLI, V. J. Biometeorological factors as predictors of agronomic maturity of peanuts. AGMET, 1965 (Technical Note 6)
11. WANG, J. Y. A critique of the heat unit approach to plant response studies. Ecology 41(4):785-790, 1960.
12. WANG, J. Y. The influence of seasonal temperature ranges on pea production. J. Am. Soc. hort. Sci. 80:436-448, 1961.
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.

*

Com bolsa de suplementação do C.N.Pq.

Datas de Publicação

Publicação nesta coleção
11 Mar 2009
Data do Fascículo
1976

Histórico

Recebido
12 Jan 1976

This work is licensed under a Creative Commons Attribution-NonCommercial 4.0 International License.

[1] 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.

[2] 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.

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

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

[5] 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.

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

[7] 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.

[8] 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.

[9] 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.

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

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

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

[13] 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.