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Conference Documents: Recent submissions
Now showing items 401-420 of 597
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Rice ecosystems in Africa
(1978-03) -
Rice improvement in tropical anglophone Africa
(1978-03) -
Cassava improvement strategies for resistance to major economic diseases and pests in Africa
(1980)The cassava diseases of major economic importance in Africa are cassava mosaic, bacterial blight, and anthracnose, and the major cassava pests are cassava mealybug and green spider mite. Methods of screening cassava breeding material for resistance to the diseases and pests in the light of factors determining the disease and pest incidence and their effect on efficiency of screening have been discussed. The role of the presence of pathogenic variation and biotypes of pe.tr in determining the ... -
Technology transfer in Nigeria and Sierra Leone
(1978-03) -
Effect of plant density, spatial arrangement and plant type on weed control in cowpea and soybean: Conference Conference Proceedings of a conference held at the IITA, Ibadan, Nigeria, July 37, 1978
(1980)Since herbicides are not widely used in cowpea and soybean at the present time, cultural and manual methods are important means of weed control in the tropics. Field experiments were conducted at Ibadan (in western Nigeria) to evaluate the effect of plant density, spatial arrangement and plant type on weed control in cowpea (Vigna unguiculata) and soybean. On the average, weeds reduced seed yield of cowpea by about 46% and of soybean by about 34%. In addition, weeds present during pod ripening of ... -
Live mulch: a new approach to weed control and crop production in the tropics
(1980)Live mulch is a crop production technique in which a food crop is planted directly in a living cover of an established cover crop without tillage or destruction of the fallow vegetation. The effect of several established legume covers on weed competition, fertilizer requirement and yield of maize was studied in the field at the International Institute of Tropical Agriculture. Weed infestation was heaviest in unweeded conventionally tilled and no-tillage plots, but very low in unweeded Centrosema ... -
Testing the applicability of soil erodibility nomogram for some tropical soils
(1984)Soil erodibility measurements using field runoff plots were made for three contrasting soils in Nigeria. Field experiments were conducted over a period of 3 years from 1980 to 1983. The soil at Onne in eastern Nigeria is developed on coastal sediments and is classified as a paleudult. The soil at Ikom derived from basalt is a rhodustalf, and that at Jos on basement complex is an oxic paleustalf. Three runoff plots, each measuring 25 m x 4 m, with appropriate collection tanks and multidivisor system ... -
Initial studies on the legume: rhizobium symbiosis
(1975-06)Twenty strains of cowpea Rhizobium have been screened to date for their ability to form nodules and to fix nitrogen using the Leonard jar assembly. The strains were tested on Ife Brown, TVu 1190, and TVx 222-01B. From among the twenty, four promising strains were selected. The nodulation and nitro-gen fixing ability of these strains plus Nitragin commercial inoculant on the three cowpea varieties were tested in two soils in the greenhouse. Many of the selected strains caused an increase in the ... -
Development of improved plantain/banana germplasm with black sigatoka resistance
(1994)Variety improvement of plantain and banana (Musa spp.) is based on genetic diversity, which provides the basis for selection gain. This paper reviews result obtained by the Plantain and Banana Improvement Programme (PBIP) of the International Institute of Tropical Agriculture in the development of improved plantain germplasm (TMPx) with stable yield, improved suckering, short stature and black sigatoka resistance. The success of this programme was basedon the significant genetic variability found ... -
Les facteurs determinant labondance du vecteur mouche blanche (Bemisia tabaci, Homoptera : Aleyrodidae) et les types des virus distribues sur le manioc en R.D. Congo
(2012-02)La mouche blanche (Bemisia tabaci) est le vecteur de la mosaïque et de la striure brune du manioc. Sa population a toujours été faible dans les champs de manioc. En plus, cet insecte trés polyphage, n'avait jamais constitué d'une manière directe, une menace réelle à la culture du manioc en Afrique. Depuis quelques années, cependant, on constate une pullulation de la mouche blanche sur le manioc. En plus du rôle lui réconnu comme vecteur des virus responsables de la CMD et de la CBSD, la mouche ... -
Alternative breads from cassava flour
(1994)New and alternative nutritious breads, can be produced from cassava flour fortified with 20% raw or roasted soy flour using locally available margarine with egg white, together or without xanthan gum. Margarine with egg white, increased control loaf volumes by 29%; the subsequent addition of xanthan increased oven rise and volumes by 35%. Margarine, and more significantly, egg white reduced the extent of starch gelatinization and solubilization in the bread, rendering them less gummy. Loaf volume ... -
Cassava in the production of bread and bakery products
(1994)A significant proportion of wheat flour can be replaced by cassava flour in the making of bread with little changes in the quality of bread. This paper shows that it is possible to make bread without using wheat flour. Soybean flour can also be mixed with cassava flour to increase the protein content of the baked products. Recipes for making breads, cakes an biscuits from cassava flour, and bread from cassava starch are presented. Sensory evaluation tests show that all baked cassava products are ...