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African Crop Science Journal
African Crop Science Society
ISSN: 1021-9730 EISSN: 1021-9730
Vol. 4, No. 1, 1996, pp. 63-70
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Bioline Code: cs96041
Full paper language: English
Document type: Research Article
Document available free of charge
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African Crop Science Journal, Vol. 4, No. 1, 1996, pp. 63-70
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Chivinge, O.A.; Mashingaidze, A.B. & Mutsvairo, M.
Résumé
L'effet du temps de germination de l'Acanthospermum
hispidum DC et de sa duree de competition avec le soja
(Glycine max (L.) etait etudie en champ au cours des saisons
de pluies 1991/92 et 1992/93 a Chegutu au Zimbabwe sur un
nitisol rhodique ayant un pH de 6,5. Le rendement de
soja-graines en champ sarclee etait de 3,6 t/ha, mais sa
culture non sarclee pendant route la saison reduisait la
croissance du soja et son rendement en graines a 1,84 t/ha
tout en prolongeant sa periode de floraison a 30 jours.
L'Acanthospermum hispidum qui levait 2 a 3 semaines
apres le soja, retardait sa floraison de 14 jour. La
competition du soja reduisait la croissance de
l'Acanthospermum, son diametre de tige par 2,4 a 4,8 mm et son
rendement en grains de 910 a 960 kg/ha. La floraison et
formation de semences de l'Acanthospermum etaient retardees de
14 jours lorsque les plants levaient 2 a 3 semaines apres le
soja. L'Acanthospermum qui levait avec le soja et entrait en
competition pour toute la saison, reduisait la croissance et
le rendement en graines de la culture de la culture. Les
plants de l'Acanthospermum qui levaient 2 a 3 semaines plus
tard etaient moins competitifs et produisaient peu de
semences.
Mots Clés
Acanthospermum hispidum DC, Glycine max (L.) Merrill, floraison, rendement en grains, croissance, semences, senescence, concurrence des mauvaises herbes
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Upright Starbur Weed Competition with Soybean
Chivinge, O.A.; Mashingaidze, A.B. & Mutsvairo, M.
Abstract
The effect of upright starbur (Acanthospermum hispidum
DC) time of emergence and duration on its competition with
soybean (Glycine max (L.) was studied under field
conditions during the 1991/92 and 1992/93 rainy season at
Chegutu in Zimbabwe on a Rhodic Nitisols. Soybean grain yield
under weedfare conditions was 3.6 t ha-1, but full season
competition from the weed reduced soybean grain yield by 1.84
t ha-1 and extended the flowering period by 30 days. Upright
starbur that emerged 2-3 weeks after soybean emergence delayed
flowering by 14 days. Competition from soybean reduced upright
starbur growth, stem diameter by 2.4 to 4.8 mm and seed yield
by 910-960 kg ha-1. Flowering and seed set in upright starbur
was delayed by 14 days when the plants emerged 2 and 3 weeks
after soybean emergence. Upright starbur plants which emerged
with soybean and competed for the full season reduced growth
and grain yield of the crop. Upright starbur plants that
emerged 2 and 3 weeks later were less competitive and produced
fewer seeds.
Keywords
Acanthospermum hispidum DC, Glycine max (L.) Merrill, flowering, grain yield, senescence, weed competition, growth, seeds
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© Copyright 1996 - African Crop Science Society
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