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Book 1991

Autor: Couper, D.C.

In agriculture, surveying is required to prepare topographical maps that indicate variations in the level of the land's surface. Topographical maps are necessary as a base for the preparation of research station maps which include layout of field, buildings, roads, and soil conservation measures.

Enlace original: https://cgspace.cgiar.org/handle/10568/98714

Investigación en Agricultura
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Couper, D.C. ,  [Land survey for research stations: IITA research guide, No. 1] ,  Land survey for research stations: IITA research guide, No. 1
Book 1995

Autor: Couper, D.C.

Tropical soils are generally low in fertility, physically fragile and easily eroded when cleared of natural cover. Cultivation is carried out in the tropics purely for weed control, but this leads to accelerated soil erosion, as cultivated soil) has no protection. Gully erosion can be minimized b...

Enlace original: https://cgspace.cgiar.org/handle/10568/97247

Investigación en Agricultura
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Couper, D.C. ,  [No-till farming in the humid and subhumid tropics of Africa] ,  No-till farming in the humid and subhumid tropics of Africa
Book 1995

Autor: Couper, D.C.

Research scientists must have access to field records to ensure that their experimental treatments are neither masked nor affected by previous land usage. Research fields must be identified on the ground and accurate records kept of all operations and treatments carried out. Several procedures ha...

Enlace original: https://cgspace.cgiar.org/handle/10568/97248

Investigación en Agricultura
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Couper, D.C. ,  [Farm records and work planning on agricultural research farms] ,  Farm records and work planning on agricultural research farms
Book 1995

Autor: Couper, D.C.

Good roads can prevent costly damage to machinery. Erosion of roads can be avoided by proper design and construction. Earth roads require continuous maintenance. Maintenance is easy if carried out correctly and routinely.

Enlace original: https://cgspace.cgiar.org/handle/10568/97250

Investigación en Agricultura
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Couper, D.C. ,  [Building and maintenance of roads on agricultural research farms] ,  Building and maintenance of roads on agricultural research farms
Book 1995

Autor: Couper, D.C.

Every research station requires water. Local urban water supplies may be unreliable. Land storage tanks may be required. A research station may need to develop its own water supply by constructing wells or dams.

Enlace original: https://cgspace.cgiar.org/handle/10568/97249

Investigación en Agricultura
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Couper, D.C. ,  [Aquatic resources of agriculture research stations] ,  Aquatic resources of agriculture research stations
Book 1995

Autor: Couper, D.C.

Crop Cultivation makes agricultural soils susceptible to erosion. Land may become incapable of producing crops. Contour banks help to prevent gully erosion, the most spectacular type of erosion. This document describes design and construction of graded contour banks.

Enlace original: https://cgspace.cgiar.org/handle/10568/97246

Investigación en Agricultura
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Couper, D.C. ,  [Use of graded contour banks for soil conservation] ,  Use of graded contour banks for soil conservation
Book 1992

Autor: Couper, D.C.

Les chercheurs doivent avoir acces aux don-nees de champ pour s'assurer que leurs traitements ex-perimentaux ne sont ni masques, ni affectes par I'utilisation prealable des parcelIes. Lea champs expe-rimentaux doivent etre identifies sur place et des don-nees doivent etre correctement relevees su...

Enlace original: https://cgspace.cgiar.org/handle/10568/98719

Investigación en Agricultura
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Couper, D.C. ,  [Operations agricoles dans les fermes experimentales: guide de recherche de lIita, No. 18] ,  Operations agricoles dans les fermes experimentales: guide de recherche de lIita, No. 18
Journal Article 1992

Autor: Berner, D.K. Killani, A.S. Aigbokhan, E.I. Couper, D.C.

During the rainy season of 1991, severely reduced plant stands and severely stunted plants were observed in several fields of the cover crop Mucuna pruriens (L.) DC. var. utilis (Wallich ex Wight) Baker ex Burck at the International Institute of Tropical Agriculture in Ibadan, Nigeria. Initial ou...

Enlace original: https://cgspace.cgiar.org/handle/10568/103273

Investigación en Agricultura
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Berner, D.K. ,  Killani, A.S. ,  Aigbokhan, E.I. ,  Couper, D.C. ,  [Macrophomina phaseolina on the tropical cover crops Mucuna pruriens var. utilis] ,  Macrophomina phaseolina on the tropical cover crops Mucuna pruriens var. utilis
Book 1991

Autor: Couper, D.C.

Guide de recherche de l'Iita No. 1 Leves topographiques pour les stations de recherche 1 Cartes 2 Instruments d'arpentage 3 Execution des leves topographiques 4 Calcul de ]a superficie des mampe 5 Enregistrement des donnees: Eumple 6 Utilisation de l'equipement d'arpentage: Exercioe pratique 7 Ca...

Enlace original: https://cgspace.cgiar.org/handle/10568/98767

Investigación en Agricultura
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Couper, D.C. ,  [Leves topographiques pour les stations de recherche: guide de recherche de lIita, No. 1] ,  Leves topographiques pour les stations de recherche: guide de recherche de lIita, No. 1
Book 1993

Autor: Couper, D.C.

Les cartes topographiques servent de base pour la planification des fermes. Elles peuvent etre utilisees dans la determination des pentes et de la topographie. On peut les utiliser e n association avec !'information sur les types de sol dans la planification des fermes experimentale.

Enlace original: https://cgspace.cgiar.org/handle/10568/97292

Investigación en Agricultura
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Couper, D.C. ,  [Utilisation des cartes dans la planification des fermes experimentales: Guide de recherche de lIita, No. 7] ,  Utilisation des cartes dans la planification des fermes experimentales: Guide de recherche de lIita, No. 7

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