Journal and Journal Articles: Recent submissions

Now showing items 1561-1580 of 5273

    • Assessment of the cropping cycle effects on black leaf streak severity and yield decline of plantain and plantain hybrids 

      Mobambo, K.N.; Gauhl, F.; Swennen, R.; Pasberg-Gauhl, C. (1996)
      Black leaf streak (BLS), an airborne fungal Black leaf streak, caused byMycosphaerella fijiensisMorelet, is a major constraint to plantain production. Owing to limitations associated with the use of chemicals in Africa, development of resistant cultivars seems to be an appropriate approach to control the cultivars. Resistance and yield performance of three plantain hybrids (TMP × 597–4, TMP × 548–4 and TMP × 548–9) were evaluated and compared with the maternal plantain ‘Obino I'Ewai’ over two ...

    • Effects of simulated and natural sunlight on the germination of conidia of Metarhizium flavoride Gams and Rozsypal and interactions with temperature 

      Moore, D.; Higgins, P.M.; Lomer, C. (1996)

    • 13CNMR assignments for methyls and quarternary carbons of the limonoid abacunone 

      Rugutt, J.k.; Fischer, N.H.; Nauman, M.A.; Schidt, T.J.; Berner, D.K. (1996)
      The high field1H and13C resonances of obacunone were established by a series of I D and 2D NMR experiments. The13C-NMR signals of the five tertiary methyl groups and all quatenary carbons were unambiguously assigned. The results confirm the stereochemical assignments at all stereogenic centres.

    • Market‐led options to scale up legume seeds in developing countries: Experiences from the Tropical Legumes Project 

      Rubyogo, Jean‐Claude; Akpo, Essegbemon; Omoigui, Lucky; Pooran, Gaur; Chaturvedi, Sushil Kumar; Fikre, Asnake; Haile, Desmae; Hakeem, Ajeigbe; Monyo, Emmanuel; Nkalubo, Stanley; Fenta, Berhanu; Binagwa, Papias; Kilango, Michael; Williams, Magdalena; Mponda, Omari; Okello, David; Chichaybelu, Mekasha; Miningou, Amos; Bationo, Joseph; Sako, Dramane; Kouyate, Zoumana; Diallo, Sory; Oteng‐Frimpong, Richard; Yirzagla, Julius; Iorlamen, Teryima; Garba, Umar; Mohammed, Haruna; Ojiewo, Chris; Kamara, Alpha; Varshney, Rajeev; Nigam, Shyam Narayan; Janila, Pasupuleti; Nadaf, Hajisaheb Lalasab; Kalemera, Sylvia (John Wiley & Sons, Inc, 2019-07)

    • Feeding behaviour of biotype E greenbug (Homoptera: Aphididae) and its relationship to resistance in sorghum 

      Dixon, Alfred G.O.; Bramel-Cox, P.J.; Reese, J.C. (1990)
      The feeding behavior of biotype E greenbug, Schizaphis graminum (Rondani), on seedlings of sorghum, Sorghum bicolor (L.) Moench, genotypes with various levels and mechanisms of seedling resistance was examined in a 12-h period with a computerized electronic insect feeding monitor. Results indicated that 7 of the 12 behavioral events monitored (durations of phloem ingestion, probing, and salivation; time to first committed phloem ingestion; and frequencies of occurrence of baseline, probing, and ...

    • Studies on epidemiology of virus diseases of chickpea in California 

      Bosque-Pérez, N.A.; Buddenhagen, I.W. (1990)

    • Trypsin inhibitor levels in raw and cooked cowpea (Vigna unguiculata) seeds 

      Carsky, R.; Della Gatta, C.; Piergiovanni, A.R.; Ng, N.Q.; Perrino, P.; Carnovale, E. (1990)

    • Decomposition of Carbon14 labelled ryegrass and maize under tropical conditions 

      Ayanaba, A.; Jenkinson, D.S. (1990)
      This work is an extension of earlier studies on the rate of decay of plant material in the forest zone of Nigeria. Maize (Zea mays L.) leaves, uniformly labeled with 14C, were allowed to decompose for 2 yr under field conditions in an Alfisol (pH 7.0) or an Ultisol (pH 4.7). After two years, 15% of the original plant C still remained in the Alfisol. Decomposition was slower in the Ultisol, particularly during the first 26 wk. Maize leaves incorporated in soil at the beginning of the dry season ...

    • Evaluation of elite lines of cowpea (Vigna unguiculata (L.) Walp.) for leaf/fodder plus grain (i.e., dual purpose) 

      Akundabweni, L.S.; Peter-Paul, C.; Singh, B.B. (1990)
      The line TVx1948-01F gave the best combination of high grain yield and high yield of fresh leaves for human consumption and fodder. Generally, lower total fresh leaf yields were associated with early to medium flowering and high total pod and total grain yields.

    • Area harvests equivalency ratio for measuring efficiency in multiseason intercropping 

      Balasubramanian, V.; Sekayange, L. (1990)
      Both area and time factors have to be considered to quantify resource-use efficiency in multiseason intercropping. The land equivalent ratio (LER), commonly used as an indicator of efficiency, is not suitable because it considers only the area factor to estimate intercrop advantages. The area time equivalency ratio (ATER) unrealistically assumes continuous crop growth throughout the year, thus it underestimates the advantages of intercrops. To avoid these problems, some authors used the mean value ...

    • Document subject matrix as a factor of precision in computerized information systems 

      Azubuike, A.A. (1990)
      Devices meant to improve IR systems precision have not paid much attention to the subject structure of the documents recorded in the databases, rather they have focused on indexing systems and retrieval strategies. It has been found that the subject matrix of a document - the pattern of relationships existing between the array of the subjects used as its descriptors - determines the chances of the document being relevant to the question for which it is retrieved. The subject matrices of most ...

    • Biological control as the primary option in sustainable pest management: the cassava pest project 

      Herren, H.R. (1990)
      The cassava mealybug (CM), Phenacoccus manihoti Matile-Ferrero was unknown to science when it was first discovered in 1973, along the Congo-Zaire river in Central Africa. In 1981, following inten¬ sive exploration and taxonomie studies, CM was found to have originated from a limited area of South America, from where it was accidentally introduced to Africa in the late 1960s or early 1970s. In 1971, the cassava green mite (CGM), Mononychellus tanajoa (Bondar) was discovered in Uganda; it has its ...

    • Investigation on the isozyme genotype and KCIO3 resistance of seedlings in African deep water rice, Oryza glaberrima Steudel 

      Hakoda, H.; Inouye, J.; Ng, N.Q. (1990)

    • Importance du virus de la marbure du niebe et du virus de la mosaique jaune du niebe au Togo 

      Gumedzoe, M.Y.; Sunu, D.Y.; Thottappilly, G.; Asselin, A. (1990)
      Deux virus du niébé (Vigna unguiculata), le virus de la marbrure du niébé et le virus de la mosaïque jaune du niébé, ont été étudiés. Les deux virus ont été identifiés et caractérisés à l'aide de la gamme de plantes indicatrices et de méthodes sérologiques. Les deux virus sont très répandus dans les principales régions productrices du niébé. Le virus de la mosaïque jaune du niébé a été retrouvé dans 65 % des échantillons virosés et le virus de la marbrure du niébé dans 35 % des échantillons. Des ...

    • Distribution and species composition of lepidopterous maize borers in southern Nigeria 

      Bosque-Pérez, N.A.; Mareck, J.H. (1990)
      The distribution and species composition of lepidopterous maize borers was studied in six locations in southern Nigeria during the second planting season (August-November) of 1985 and 1986. Sesamia calamistis Hampson (Noctuidae) and Eldana saccharina Walker (Pyralidae) were the stem borers most abundantly found in the locations sampled. S. calamistis was the dominant species up to eight weeks after planting in all locations. E. saccharina was the most abundant species from nine weeks after planting ...

    • Tetraploids, triploids and 2n pollen from diploid interspecific crosses with cassava 

      Hahn, S.K.; Bai, K.V.; Asiedu, Robert (1990)
      Interspecific crosses of five cultivated cassava varieties (2n=36) were made with two related Manihot species, M. epruinosa (2n=36) and M. glaziovii (2n=36). From these diploid interspecific crosses, four spontaneous tetraploids (2n=4x=72) and two triploids (2n=3x=54) were isolated for the first time in cassava. Occurrence of relatively high frequencies (0.1%–35.6%) of 2n pollen and of apomixis seems to be associated with sexual polyploidization. The tetraploids and triploids were very vigorous ...

    • Nutrient addition into soil by leaves of Cassia siemea and Gliricidia sepium growth on an alfisol in southern Nigeria 

      Ghuman, B.S.; Lal, R. (1990)

    • Effect of seedbed preparation method and mulch on soil physical properties and yield of cowpea in a rice fallow of an inland valley swamp 

      Hulugalle, N.R.; Palada, M.C. (1990)
      The effects of three seedbed preparation methods: mounds, minimum (handhoe) tillage and zero tillage; and two residue management methods: application of 4 Mg ha- ' of rice straw mulch and no mulch on soil physical properties and yield of cowpea ( Vigna unguiculata (L.) Walp.) were studied in a rice fallow of an inland valley swamp in central Nigeria during the dry seasons of 1988 and 1989. Soil physical properties measured were particle size distribution, bulk density, soil water retention, ...

    • Effect of hedgerow species in alley cropping systems on surface soil physical properties of an Oxic Paleustalf in southwestern Nigeria 

      Hulugalle, N.R.; Kang, B.T. (1990)
      Effects of hedgerow species on surface soil physical properties were studied in an on-going trial established since 1981 on an Oxic Paleustalf in southwestern Nigeria. The experimental treatments were Leucaena leucocephala, Gliricidia sepium, Alchornea cordifolia and Acioa barterii hedgerows planted at 4 m interhedgerow spacings and a control (no hedgerows). Plots were sequentia-ly cropped with maize (Zea mays) and cowpea (Vigna unguiculata). Soil physical properties, i.e. particle size distribution, ...

    • Yield of maize and cowpea in an alley cropping system in relation to available light 

      Lawson, T.L.; Kang, B.T. (1990)
      Measurements of incident solar radiation were made in sequentially cropped maize (Zea mays L.) and cowpea (Vigna unguiculata L. Walp.) planted between hedgerows of shrubs in an alley cropping pattern. The incident solar-radiation profile was examined and its effect on crop yield determined. The study involved four different species of shrubs (Leucaena leucocephala (Lam) de Wit, Gliricidia sepium (Jacq.) Walp, Alchornea cordifolia, and Acioa barterii), planted at two row spacings (2 and 4 m) and ...