IITA Bibliography System: Recent submissions

Now showing items 21-40 of 7906

    • Selection of extra-early white quality protein maize (Zea mays L.) inbred lines for drought and low soil nitrogen resilient hybrid production 

      Annor, B.; Badu-Apraku, B. (2024-01-30)
      In West and Central Africa (WCA), drought and low soil nitrogen (low N) impede increased maize (Zea mays L.) productivity and production. Due to climate change, the two stresses usually occur together, leading to food, nutritional, and economic insecurity in the sub-region. There is, therefore, the need for the development and availability of high-yielding extra-early maturing white Quality Protein Maize (QPM) synthetics and hybrids with resilience to the prevailing stresses through the identification ...

    • Misattribution prevents learning 

      Hoel, J.B.; Michelson, H.; Norton, B.; Manyong, V. (2024)
      In many markets, consumers believe things about products that are not true. We study how incorrect beliefs about product quality can persist even after a consumer has used a product many times. We explore the example of fertilizer in East Africa. Farmers believe much local fertilizer is counterfeit or adulterated; however, multiple studies have established that nearly all fertilizer in the area is good quality. We develop a learning model to explain how these incorrect beliefs persist. We show ...

    • Household economics of cocoa agroforestry: costs and benefits 

      Boadi, S.A.; Bosselmann, A.S.; Owusu, K.; Asare, R.; Olwig, M.F. (Palmgrave Macmillan, 2024)
      Current research suggests that cocoa agroforestry systems could offer stable yields, additional benefits and income from shade trees, despite potential added costs, such as from the purchase of insecticides. There is a paucity of profitability studies of different cocoa agroforestry systems. Only few of them go beyond a narrow focus on cocoa yields to model the entire agroforestry system and thus do not advance our understanding of the socio-economic value of other ecosystem goods. Based on survey ...

    • Feed the Future: gender equality and social inclusion training 

      USAID; International Instittute of Tropical Agriculture (United States Agency for International Development, 2023)

    • Enhancing horticultural productivity, incomes and livelihoods through integrated management of aphid pests on vegetables in sub-Saharan Africa 

      Hanna, R.; Fotso-Kuate, A.; Kumar, P.L.; Djomaha, E.; Toukem, N.; Dongmo, M.; Doumtsop, A.; Ramasamy, S.; Abang, A.; Ekesi, S.; Mohamad, S.; Bayissa, W.H.; Singh, A.B.; Houmgny, R.; Weisser, W.; Keukenou, S.; Ghogomu. T.R. (International Institute of Tropical Agriculture, 2016-09)
      Through several surveys and field trials we determined species composition and distribution of aphids as well as virus incidence on okra and cabbage in Cameroon and okra and kale in Kenya. On cabbage and kale, the cabbage aphid and false turnip aphid were, respectively, most important in higher and lower altitudes. The cabbage aphid in Kenya was associated with both specialist and generalist natural enemies whereas in Cameroon the specialist parasitoid Diaeretiella rapae was absent. Attempts to ...

    • Fertilizer and soil health for enhanced productivity and sustainability in sub- Saharan Africa 

      Vanlauwe, B.; Brown, P.H.; Bruulsema, T.; Dobermann, A.; Hungria, M.; Majumdar, K.; McLaughlin, M.; Wager-Riddle, C.; Zhang, X.; Zhao, F. (Scientific Panel on Responsible Plant Nutrition, 2024-02-06)

    • A new multivariate agricultural drought composite index based on random forest algorithm and remote sensing data developed for Sahelian agrosystems 

      Hanadé Houmma, I.; Gadal, S.; El Mansouri, L.; Garba, M.; Gbetkom, P.G.; Mamane Barkawi, M.B.; Hadria, R. (2023-06-16)
      This manuscript aims to develop a new multivariate composite index for monitoring agricultural drought. To achieve this, the AVHRR, VIIRS, CHIRPS data series over a period of 40 years, rainfall and crop yield data as references were used. Variables include parameters for vegetative stress (SVCI, PV, SMN), water stress (PCI, RDI, NRDI), and heat stress (SMT, TCI, STCI), and a new variable related to environmental conditions was calculated through a normalized rainfall efficiency index. Then, random ...

    • Soybean production manual: good agronomic practices for soybean production in northern Ghana 

      Kermah, M.; Adjei-Nsiah, S.; Ofosu, A. (SSPiNG Project, 2022-05)

    • Evaluating breeding for broad versus narrow adaptation for cassava in Nigeria using stochastic simulation 

      Bakare, M.A.; Kayondo, S.I.; Kulakow, P.; Rabbi, I.Y.; Jannink, J.L. (2024)
      The cassava (Manihot esculenta Crantz) breeding program at the International Institute of Tropical Agriculture (IITA) has adopted genomic selection to accelerate genetic gain. The program continues to develop varieties broadly adapted across Nigeria’s diverse agroclimatic zones. However, genotype by- environment interaction (GEI) presents a challenge for this purpose. To decide whether broad adaptation breeding is a good strategy, we evaluated broad versus narrow adaptation strategies using ...

    • Sustainable soybean production in souther highlands of Tanzania (TSSI PROJECT): training manual on GAPs for sustainable intensification of soybean production for agriculture extension agents 

      Baijukya, F.; Mzanda, A. (IInternational Institute of Tropical Agriculture, 2023)

    • Contribution of Gliricidia sepium green leaf biomass on maize grain nutrient properties 

      Alamu, E.O.; Njoloma, J.; Ngumayo, J.; Akello, J.; Chikoye, D.; Nyoka, I.; Dale, L.; Ray, C.; Mehreteab, T.; Nagothu, U.S. (International Institute of Tropical Agriculture, 2023)

    • Grafting experience and shade influences graft take of avocado scions 

      Ayarna, A.W.; Adjei-Nsiah, S.; Tsukagoshi, S.; Ulsen, J.; Sintim, H.O.; Aduse, P.S.; Bukari, M.; Nkansah, G.O. (2024-02)
      Avocado is an important tree crop grown in the tropics, including Ghana. Avocados are primarily propagated by seed into trees, which grow to provide shade for young cocoa trees and, subsequently, food and income. Cultivation of this crop as a monocrop is limited in Ghana; hence, there is a considerable risk of losing desirable genetic materials. There has been an effort by scientists at the University of Ghana to collect and curate available avocado germplasm to preserve, multiply, and disseminate ...

    • Fertilizer-bioinsecticide synergy improves maize resilience to Spodoptera frugiperda infestation 

      Fiaboe, K.R.; Agboka, K.; Agnamba, A.O.; Teyo, K.L.; Amegah, A.L.; Koffi, D.; Kpadonou, G.E.; Agboka, K.M.; Gwokyalya, R.; Fening, K.O.; Fiaboe, K. (2024-03)
      Fall armyworm (FAW), Spodoptera frugiperda (Smith) (Lepidoptera: Noctuidae), invasion in Africa has threatened food security. Optimization of plant tolerance and post-infestation recovery are among the management tactics that are being promoted for the integrated management of this pest, but these techniques are poorly studied in sub-Saharan Africa. Our study examined the efficacy of enriched compost, split-NPK fertilization, conventional fertilization, and bioinsecticides on FAW infestation rates, ...

    • Does simultaneous adoption of drought-tolerant maize varieties and organic fertiliser affect productivity and welfare outcomes? Evidence from rural Nigeria 

      Oyetunde-Usman, Z.; Shee, A.; Abdoulaye, T. (2024-01)
      The promotion of improved maize varieties and chemical fertilisers underscores many policy approaches addressing multiple production risks such as poor soil fertility and drought. However, the unsustainable use of chemical fertilisers has important implications for soil degradation. The synergies between improved maize varieties and sustainable land use management practices such as the use of organic fertilisers (e.g., manure) are poorly documented, despite the role of manure in enhancing soil ...

    • Urea briquettes combined with a fertilizer blend reduces fertilizer costs and improves yields of irrigated rice in Rwanda 

      Kayumba, J.; Wendt, J.; Cyamweshi, A.R.; Ndayisaba, P.C.; Kuyah, S.; Ngunjiri, M.; Rutebuka, J.; Nabahungu, L.N. (2023-04-06)
      We evaluated the yield and potential economic impact in Rwanda of replacing the standard lowland rice (Oryza sativa L.) fertilizer recommendation from the current practice of 200 kg NPK 17-17-17 ha−1 and 100 kg urea ha−1 with a basal blend of 74 kg diammonium phosphate (DAP), 57 kg potassium chloride (KCl), and deep placement of 112.5 kg urea briquettes ha−1 at 4 weeks after transplanting. Experiments were carried out in nine diverse marshlands across Rwanda in the long and short rainy seasons of ...

    • What shapes yields of East African Highland banana? An explorative study from farmers’ fields 

      den Braber, H.; van de Ven, G.; van Heerwaarden, J.; Marinus, W.; Ronner, E.; Descheemaeker, K.; Taulya, G. (2024-05)
      Context or problem East African Highland banana is a main staple and cash crop for millions of people in the Great Lakes region of Africa. Reliable methods for banana yield estimation are lacking and factors underlying yield variability are not well understood. Objective or research question We studied the interrelations and relative importance of yield components (yield per mat, mat density, bunch weight, cycle duration and the number of bunches harvested per mat per year or per hectare per ...

    • Haplotype-resolved genome of heterozygous African cassava cultivar TMEB117 (Manihot esculenta) 

      Landi, M.; Shah, T.; Falquet, L.; Niazi, A.; Stavolone, L.; Bongcam-Rudloff, E.; Gisel, A. (2023-12-09)
      Cassava (Manihot esculenta Crantz) is a vital tropical root crop providing essential dietary energy to over 800 million people in tropical and subtropical regions. As a climate-resilient crop, its significance grows as the human population expands. However, yield improvement faces challenges from biotic and abiotic stress and limited breeding. Advanced sequencing and assembly techniques enabled the generation of a highly accurate, nearly complete, haplotype-resolved genome of the African cassava ...

    • Datasets from fertilized improved and local varieties of cassava grown in the highlands of South Kivu, Democratic Republic of Congo 

      Munyahali, W.; Birindwa, D.R.; Pypers, P.; Swennen, R.; Vanlauwe, B.; Merckx, R. (2024-02)
      The use of mineral fertilizer and organic inputs with an improved and local variety of cassava allows (i) to identify nutrient limitations to cassava production, (ii) to investigate the effects of variety and combined application of mineral and organic inputs on cassava growth and yield and (iii) to evaluate the profitability of the improved variety and fertilizer use in cassava production. Data on growth, yield and yield components of an improved and local variety of cassava, economic analysis, ...

    • Farm typology for digital green and fertilizer Ethiopia use cases 

      Pawar, R.R.; Ismael, A.D.; Descheemaeker, K.; Liben, F.; Ebrahim, M.; Eshete, M.; Tigabie, A.; Tsedalu, B.; Desta, G.; Tamene, L.; Aubert, C.; Assefa, B.; Vandamme, E.; Senthilkumar, K. (International Institute of Tropical Agriculture, 2023)

    • Enhancing smallholder maize shelling mechanization through the collective business model: the case of Northern Ghana. 

      Ansah, I.G.K.; Kotu, B.H.; Boyubie, B.; Bonney, J.E. (2024)
      This paper assessed the conditions contributing to the success of smallholder farmer groups in northern Ghana using mechanical maize shellers (MMS) based on a collective business model. A sample of 156 farmers from 18 intervention communities was analyzed using qualitative comparative analysis (QCA) to examine the conditions necessary to increase usage of MMS. The results revealed a single configuration for achieving high group MMS usage, observed in about 24 percent of the cases. This configuration ...