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vol.22 número1ALTERAÇÕES NO SISTEMA RADICULAR E CONCENTRAÇÃO DE FÓSFORO EM TREMOÇO AZUL PROVOCADAS POR ALUMÍNIO índice de autoresíndice de assuntospesquisa de artigos
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Ciência Rural

versão impressa ISSN 0103-8478

Resumo

SCHNEIDER, Flávio Miguel; BURIOL, Galileo Adeli  e  ESTEFANEL, Valduíno. OCCURENCE AND DURATION OF DAILY MINIMUM TEMPERATURES INJURIOUS TO FECUNDATION OF RICE FLOWERS IN SANTA MARIA, RS. III: OCCURENCE PROBABIUTIES OF THE DURATION WITH LOW TEMPERATURES. Cienc. Rural [online]. 1992, vol.22, n.1, pp.1-10. ISSN 0103-8478.  https://doi.org/10.1590/S0103-84781992000100001.

Using daily minimum, maximum and at 21:00 hours temperatures observed during December, January, February and March registred in the main weather station located in Santa Maria, RS, the probabilities of occuring the maximum number of hours with air temperatures ≤ 10, 11 , 12, 13, 14, 15, 16 and 17,0°C was determined as well as the sequency of consecutive days with at least on hour with air temperatures ≤ 15, 16 and 17,0°C. These probabilities were obtained for every decade of December, January, February and March. The results indicated that the risks of occuring temperatures considered as damaging to fecundation of rice flowers is much lower in the 2° and 3° decades of February. Therefore seeding or cultivar choice should be done in such a way that flowering occurs during the second and third decade of February.

Palavras-chave : rice; cold; risk; occurence probability.

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