Welcome to the International Institute of Tropical Agriculture Research Repository
Conference Documents: Recent submissions
Now showing items 521-540 of 727
-
Cassava Bacteria Blight in Africa
(1976-11) -
Breeding of root and tuber crops
(1977)The constraint to the production of the root and tuber crops, cassava, yams and sweet potato in Nigeria and Africa were stated. Breeding methods most appropriate to these crops were discussed in terms of mating systems, creation of source populations, selection, and use of selections. Intervarietal hybridization, interspecific hybridization, and population improvement through cyclic selection and recombination procedures were discussed as methods of creating source populations. Factors affecting ... -
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 ...
