Volume 20, Number 4, May-June 2000
Page(s) 375 - 382
DOI: 10.1051/agro:2000134

Agronomie 20 (2000) 375-382

Germination behaviour of red rice (Oryza sativa L.) seeds in field and laboratory conditions

Francesco Vidotto - Aldo Ferrero

Dipartimento di Agronomia Selvicoltura e Gestione del Territorio, Università degli Studi di Torino, Via Leonardo Da Vinci, 44, 10095 Grugliasco (TO), Italy

(Received 7 February 2000; revised 4 April 2000; accepted 6 April 2000)


Two experiments were carried out in 1996-1998 to study (1) the germination behaviour of red rice seeds kept for different periods of time in field and laboratory conditions, and (2) the weed emergence behaviour in response to different burial depths. The first experiment was carried out considering mature red rice seeds of two biotypes which were exposed to field conditions and to 20 $^\circ$C, for different periods of time, and then tested for their germinability over 6 months. The time required for red rice seed to germinate in petri dishes depended on the storage conditions and proved to be inversely related to the storage duration. Immediately after harvesting, the red rice seeds required 180 days of permanence in petri dishes to germinate. This time was reduced to 20 days when the seeds were exposed for 30 days at 20 $^\circ$C or for 160 days in field conditions. The second experiment was conducted both in the greenhouse and in the field, placing seeds at different depths from 0 to 13 cm, in saturated and flooded soil conditions, and in loamy and clayey soil. The emergence was affected both by the depth of burial and the presence of a water layer on the soil surface, and occurred from a maximum depth of 10 cm. Most of the emergences were recorded in the 0-5 cm soil layer in saturated loamy soil (92-45%).

Keywords: rice / red rice germination / red rice emergence / weed


Germination de graines de riz rouge (Oryza sativa L.) en conditions de plein champ et de laboratoire. Le but de ce travail, réalisé de 1996 à 1998 était l'étude (1) de la germination des graines de riz rouge soumis en fonction des conditions de stockage et (2) de la capacité germinative à differentes profondeurs d'enfouissement. La première étude a consisté à soumettre des graines de riz rouge mures de deux biotypes à des conditions de plein champ et à 20 $^\circ$C pendant des périodes de différentes durées. On a ensuite testé leur capacité germinative pendant six mois. Le temps nécessaire à la germination du riz en boîtes de Petri dépendait des conditions de stockage et, en particulier, était inversement proportionnel à sa durée. Immédiatement après la récolte, le temps nécessaire à la germination des graines était de 180 jours. Dans la deuxième étude, réalisée en serre et en plein champ, on a enfoui des graines de 0 à 13 cm dans un sol limoneux et un sol argileux inondés ou saturés d'eau. L'émergence dépendait soit de la profondeur de l'enfouissement et de la présence d'une nappe d'eau à la surface du sol et avait lieu seulement à partir d'une profondeur maximum de 10 cm. Dans la plupart des cas, l'émergence était observée à partir de la couche 0-5 cm dans un sol limoneux saturé (92-45 %).

Mots clé : riz / germination du riz rouge / émergence du riz rouge / adventice

Correspondence and reprints: Francesco Vidotto

Communicated by Gérard Guyot (Avignon, France)

Copyright INRA, EDP Sciences 2000

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