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African Crop Science Journal
African Crop Science Society
ISSN: 1021-9730
EISSN: 2072-6589
Vol. 4, No. 1, 1996, pp. 63-70
Bioline Code: cs96041
Full paper language: English
Document type: Research Article
Document available free of charge

African Crop Science Journal, Vol. 4, No. 1, 1996, pp. 63-70

 en Upright Starbur Weed Competition with Soybean
Chivinge, O.A.; Mashingaidze, A.B. & Mutsvairo, M.


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.

Acanthospermum hispidum DC, Glycine max (L.) Merrill, flowering, grain yield, senescence, weed competition, growth, seeds

Chivinge, O.A.; Mashingaidze, A.B. & Mutsvairo, M.


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

© Copyright 1996 - African Crop Science Society

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