Welcome to the International Institute of Tropical Agriculture Research Repository
Conference Documents: Recent submissions
Now showing items 321-340 of 726
-
Differential response of cowpea lines to application of P fertilizer
(2002)Phosphorus is important for cowpea production in many tropical African soils with inherent low P fertility. Most farmers in Africa, however, do not have access to P fertilizer. Selection of cowpea lines that produce good yield under low soil P or those with high P-use efficiency can be a low input approach to solving this problem. Pot and field trials were conducted at the International Institute of Tropical Agriculture (IITA), Ibadan, southwestern Nigeria, to assess the differ ential P responses ... -
Yield and Nuse efficiency of five tropical maize genotypes under different N levels in the moist savanna of Nigeria
(1997)Two field experiments were conducted during the 1993 and 1994 growing seasons at Samaru (7° 38' E; 11° 11' N), northern Nigeria, to evaluate N-use efficiency (kg grain per kg available soil N) and yield of 5 maize genotypes planted early in the season under five levels of N. The hybrid (8644-27) gave the highest grain yield and was the most N-use efficient genotype. It had a longer grain filling period, a higher harvest index, and a greater 1000-kerneI weight than other genotypes. The most widely ... -
Optimizing the contribution of cowpea to food and fodder production in croplivestock systems in West Africa
(1997)Cowpea is important for the provision of both grain for food and fodder for livestock but there is often a trade-off between productions of two. To better understanding influences on grain and fodder production, and how these may be influences on grain and fodder production, and two these may be utilized, research was conducted at 5 location in west Africa using 12 cowpea varieties, with and without insecticide spray. Spraying had a dramatic effect on grain production, but less so for fodder, ... -
Disease progress of Peronosclerospora sorghi on some Ugandan maize genotypes
(1997)The type and level of disease reaction of Ugandan maize genotypes to Peronosclerospora sorghi was characterized using several variables during the second season of 1994 at two locations, Nazaretti in Mpigi district and Ikulwe in Iganga district. Maize genotypes differed significantly (p 0.05) in susceptibility as determined by the rate of disease increase (r), area under disease progress curve, and disease incidience. -
Recent advances in the development of sources of resistance to pink stalk borer and African sugarcane borer
(1997)The lepidopterous stem borers Sesamia calamistis Hampson (Noctuidae) and Eldana saccharina (Walker) (Pyralidae) are among the most important insect pests of maize in West Africa. Efforts to breed for resistance to these two borer species are an integral part of a project to develop control practices for maize pests at IITA. Since 1985, a wide diversity of maize germplasm has been evaluated for resistance to either S. calamistis or E. saccharina. Three populations with moderate resistance to E. ... -
Plant virology in subSaharan Africa: proceedings of a conference organized by IITA, 48 June 2001
(2003)The rice yellow mottle diseases is the main virus disease found on rice in Africa. It has been reported in all major rice producing zone of sub-saharan Africa (East,West,Central and Southern Africa and Madagascar). The disease incidence and accompanying yield losses could be high depending on the rice cultivars grown, the date of infection and type of rice. -
Effect of method of seed bed preparation, mulching and time of planting on yam (Dioscorea rotundata) in Western Nigeri. In C.L.A. Leakey (Eds.), Proceedings of the Third Symposium of the International Society for Tropical Root Crops (p. 293-306)
(1977)Mulching of yam seed beds reduced soil temperature and improved emergence, time of emergence, yield per hill and the total yield of Dioscorea rotundata yams on a sandy soil in Western Nigeria. Comparison of mounds with ridged and flat seed beds showed that these different treatments had no significant effect on tuber yield. Planting about six -weeks before the onset of the rains and the use of mulch is indicated as a good technique to obtain high yield.