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- W2100147446 abstract "(Received 2 June, 1999; accepted 24 November, 2001) Abstract Sorghum (Sorghum bicolor (L.) Moench) is an important crop that is usually grown on the Vertisols of north eastern Nigeria during the dry season. The crop is grown on soils with residual moisture, and thus exposing it to terminal drought stress. Improvement of resource use efficiency and yields is probably possible through the use of appropriate plant densities. Field trials were therefore conducted to study the effects of four plant densities, varying from 2.0 to 12.5 plants m-2 on water and radiation use and performance of two Masakwa sorghum varieties grown on a Vertisol under residual soil moisture conditions. At higher plant densities the locally adapted Nigerian variety, Bulwalana produced higher grain yields than the selection from Cameroun, Bourgouri-28. It also had more efficient water use and better light interception. At low plant densities, Bourgouri-28 yielded higher than Bulwalana. Leaf area index and radiation interception increased with increasing plant density. Stem borer incidence decreased with increasing plant density. More stem borer holes and stem tunnelling were recorded in Bulwalana than in Bourgouri-28. Covered kernel smut [Sporisorium sorghi (Ehrenberg) Link] appeared to be a potentially serious disease of the crop. The study showed that the performance of the crop can be improved through manipulation of plant population and use of early maturing cultivars. Key Words: Sorghum bicolor, transplanted sorghum, water use efficiency, yield Résumé Le sorgho (Sorghum bicolor (L.) Moench) est une culture importante sur les Vertisols de la partie nord est du Nigéria pendant la saison sèche. Planté généralement à cause de l'humidité residuelle, le sorgho souffre souvent du stress hydrique de fin de cycle. L'amélioration de l'utilisation efficace des ressources et des rendements est possible à travers l'usage des densités appropriées des plantes. Les essais de champ ont été ménés pour étudier les effets de quatre densités des plantes, variant entre 2.0 et 12.5 plantes m-2 sur l'utilisation de l'eau, de la radiation et sur la performance de deux variétés de sorgho Masakwa cultivées sous des conditions d'humidité résiduelle. A des densités de plantes élévées, la variété Nigériane localement adaptée, Bulwalana a produit un rendement en grains plus élévé que la sélection du Cameroun, Bougouri-28. Elle avait aussi une utilisation plus efficace de l'eau et une meilleure interception de la radiation. Aux densités basses, Bougouri-28 a eu un rendement plus élévé que celui de Bulwalana. La surface foliaire et l'interception de la radiation ont augmenté avec la densité des plantes. L'incidence des foreurs des tiges a diminué avec l'augmentation des densités des plantes. Un plus grand nombre des trous des foreurs des tiges et des percements des tiges ont été enregistrés sur Bulwalana que sur Bourgouri-28. Le charbon couvert [Sporisorium sorghi (Ehrenberg) Link] apparait comme une maladie potentielle sérieuse de ce sorgho. Cette étude a montré que la performance de ce sorgho peut être améliorée en manipulant la densité des plantes et en utilisant des cultivars adaptés et précoces. Mots Clés: Sorghum bicolor, foreur des tiges, efficacité d'utilisation de l'eau, rendement (Af Crop Sci J 2002 Vol 10 No 1 pp31-38)" @default.
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- W2100147446 date "2002-01-01" @default.
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- W2100147446 title "Effect of plant population density on the growth and yield of sorghum varieties grown on a <I>vertisol </I>" @default.
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- W2100147446 doi "https://doi.org/10.4314/acsj.v10i1.27555" @default.
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