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African Crop Science Journal
African Crop Science Society
ISSN: 1021-9730
EISSN: 2072-6589
Vol. 4, No. 2, 1996, pp. 197-206
Bioline Code: cs96057
Full paper language: English
Document type: Research Article
Document available free of charge

African Crop Science Journal, Vol. 4, No. 2, 1996, pp. 197-206

 en Maize and sorghum yields under tied ridges of fertilised sandy soils in semi-arid south-east lowveld of Zimbabwe
Nyakatawa, E.Z.; Brown, M. & Maringa, D.

Abstract

Growing maize and sorghum in furrows of 1.0 m and 1.5 m wide tied ridges with
either 100 kg or 200 kg compound D ha-1(8:14:7 NPK, basal fertilizer) + 50
kg N ha-1 top dressing were compared to the traditional farmers' practice of
growing these crops on flat land without fertilizer. The crops were grown
under rainfed conditions on sandy soils of Matibi 1 and Chivi communal areas
in semi-arid agro-ecological regions IV and V in the south-east lowveld of
Zimbabwe, from 1987/88 to 1989/90. Grain yield of maize in 1.0 m wide tied
ridges was increased significantly by 22 to 85% over sowing on flat land and
sorghum grain yield was increased by 18%. Application of inorganic fertilizer
resulted in significant yield increases of 35 to 115% in maize grain, 59 to
200% in sorghum grain, 27 to 96% in maize stover and 63 to 161% in sorghum
stover, compared to no fertilizer application. The benefits of growing crops
in tied ridges and the incremental gross margins in Z$ ha-1 of fertilizer
application were more associated with monthly rainfall distribution than with
the total summer rainfall.

Keywords
Grain yield, incremental gross margins, inorganic fertilizer, rainfed, sandy soils, soil fertility, stover yield, tied ridges

 
 fr
Nyakatawa, E.Z.; Brown, M. & Maringa, D.

Résumé

La culture de maos et de sorgho en sillons espaces de 1.0 et 1.5 m avec des
billons lies et une fertilisation de 100 kg ou 200 kg par ha du compose D
(8:14:7 NPK, engrais de fond) avec 50 kg N/ha d'engrais de couverture a ete
comparee avec la culture traditionelle des fermiers i.e une culture sur terre
plate sans engrais. La culture etait etablie de 1987/1988 jusque 1989/1990
dans de conditions de precipitation naturelle et sur des sols sableux de
Matibil et des aires de la commune Chivi dans des regions agro-ecologiques
semi arides IV et V dans les plaines du sud est de Zimbabwe. Le rendement des
grains de maos sur des billons de 1,0 m augmentait significativement de 22
jusque 85% par rapport la culture sur terre plate, alors que le rendement
de grains de sorgho augmentait de 18%. Une application d'engrais inorganique
donnait une augmentation significative du rendement de grains de maos de 35
jusque 115%, de grains de sorgho de 59 jusque 200%, de fourrage de maos de 27
jusque 96% et de fourrage de sorgho de 63 jusqu' e 161%, par rapport e la
culture sans engrais. L'avantage des cultures en billons lies et les marges
beneficaires en Z$ pour l'engrais etaient plutot associes a la distribution
de la precipitation mensuelle qu'a la precipitation totale en saison
pluvieuse.

Mots Clés
Rendement en grains, marges beneficaires, engrais inorganique, precipitation naturelle, sols sableux, fertilite du sol, rendement de fourrage, billons lies

 
© Copyright 1996 - African Crop Science Society

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