Sycios angulatus is an annual creeping plant spread in the areas along the watercourses, which have been more and more frequently reported as troublesome weed in spring crops. This research was aimed at evaluating the time required for germination of S. angulatus seeds in laboratory conditions and determining the evolution in time of main biometrical traits in field conditions. Weed germination was tested over 5 months continuously keeping mature seeds on wet sand in petri dishes at 25°C. Growing behaviour was studied in field after transplanting of weed plants at the stage of 3-4 leaves. S. angulatus seed germinations occcurred from 15 to 140 days from the beginning of the experiment following a sigmoidal function. The cumulated leaf surface was about 5,000 cm2 /plant at 50 days after transplanting (DAT) and 17,000, 83 days after. More than 80% of the leaf surface was related to leaves belonging to the first order branches. Leaf dimensions significantly varied according to the order of the branch on which were inserted, with the following ranking: stem > first order branching> second order branching. The number of internodes ranged from 47 (stem) to 267 (first order branching) with an average length of 17.9 cm. Each plant produced on average more than 600 inflorescences. The epigean portions reached an average dry matter of 490 g, 50% of which represented by stem and branchings, 40% by leaves and 10% by inflorescences.
Germination and growing behaviour of Sicyos angulatus L.
FERRERO, Aldo;VIDOTTO, Francesco
2002-01-01
Abstract
Sycios angulatus is an annual creeping plant spread in the areas along the watercourses, which have been more and more frequently reported as troublesome weed in spring crops. This research was aimed at evaluating the time required for germination of S. angulatus seeds in laboratory conditions and determining the evolution in time of main biometrical traits in field conditions. Weed germination was tested over 5 months continuously keeping mature seeds on wet sand in petri dishes at 25°C. Growing behaviour was studied in field after transplanting of weed plants at the stage of 3-4 leaves. S. angulatus seed germinations occcurred from 15 to 140 days from the beginning of the experiment following a sigmoidal function. The cumulated leaf surface was about 5,000 cm2 /plant at 50 days after transplanting (DAT) and 17,000, 83 days after. More than 80% of the leaf surface was related to leaves belonging to the first order branches. Leaf dimensions significantly varied according to the order of the branch on which were inserted, with the following ranking: stem > first order branching> second order branching. The number of internodes ranged from 47 (stem) to 267 (first order branching) with an average length of 17.9 cm. Each plant produced on average more than 600 inflorescences. The epigean portions reached an average dry matter of 490 g, 50% of which represented by stem and branchings, 40% by leaves and 10% by inflorescences.
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