Evidence and perceptions of rainfall change in Malawi: Do maize cultivar choices enhance climate change adaptation in sub-Saharan Africa?

Getting farmers to adopt new cultivars with greater tolerance for coping with climatic extremes and variability is considered as one way of adapting agricultural production to climate change. However, for successful adaptation to occur, an accurate recognition and understanding of the climate signal by key stakeholders (farmers, seed suppliers and agricultural extension services) is an essential precursor. This paper presents evidence based on fieldwork with smallholder maize producers and national seed network stakeholders in Malawi from 2010 to 2011, assessing understandings of rainfall changes and decision-making about maize cultivar choices. Our findings show that preferences for short-season maize cultivars are increasing based on perceptions that season lengths are growing shorter due to climate change and the assumption that growing shorter-season crops represents a good strategy for adapting to drought. However, meteorological records for the two study areas present no evidence for shortening seasons (or any significant change to rainfall characteristics), suggesting that short-season cultivars may not be the most suitable adaptation option for these areas. This demonstrates the dangers of oversimplified climate information in guiding changes in farmer decision-making about cultivar choice

Cephalometric Antero-Posterior Parameter Evaluation in Orthodontic Patients with Facial Asymmetries

Aesthetic and functional problems associated with significant facial asymmetry can negatively affect the patient's facial appearance, nutritional and psychosocial development. Therefore, a critical assessment and accurate treatment planning is absolutely necessary. The aim of this study was to evaluate the parameters of PA cephalometric analysis defined by Ricketts and Grummons and establish statistically relevant correlations and their importance in diagnosing orthodontic patients with varying degrees facial asymmetries. The research included facial asymmetry Romanian patients from the Department of Orthodontics and Dento-Facial Orthopedics of UMF "Victor Babes", Timisoara. The PA cephalogram investigations that met the inclusion criteria were digitally analyzed. Dental and skeletal cephalometric parameters described by Ricketts, Grummons and Kappeyne Van De Coppello were collected through linear, angular and volumetric measurements. Statistically significant correlations between the degree of asymmetry and the dimension of the internal structures were observed.Our conclusion is that PAcephalograms are cost effective and useful investigations in identifying and evaluating skeletal and dental imbalances in orthodontic facial asymmetry patients.</jats:p

Rainfall change and its implications for belg harvest in south wollo, ethiopia

Most farmers in the Ethiopian highlands depend on rain-fed agriculture. Some areas have the favourable situation of having two rainy seasons, Belg (February-May) and the long rainy season Kiremt (June-October), which is the case in some parts of South Wollo. Tef (Eragrostis tef) is the staple crop that farmers prefer to grow and the 90-day variety is suitable for growing during the short rainy season. One out of eight Ethiopians lives in tef potential areas which have Belg rainfall. The aim in this study is to analyse rainfall variation in South Wollo, in particular the area east of the small town of Hayk, and to study its effect on the ability to grow tef during the Belg season. Results from interviews showed that a more difficult farming situation had emerged during the past 40 years, largely due to deterioration of physical resources such as rainfall. Rainfall is analysed by comparing daily rainfall data from four stations in two periods, 1963 to 1982 and 1984 to 2003, for changes in totals, seasonal distribution and variability. Coefficient of variance, rainy days, rainfall intensity and dry spells were analysed. Results from this study show that there have been minor rainfall changes but greater rainfall variability. During fieldwork key informants were asked if they were able to harvest tef during the past nine years, a period that has been used in a model of rainfall influence on tef cultivation during the Belg season. In both 20–year periods, farmers were able to grow tef every second year. In spite of a greater variability in rainfall the farmers proved their knowledge and flexibility and were able to harvest tef in the same number of years during both periods.</p

Restoration of dry afromontane forest using pioneer shrubs as nurse-plants for Olea europaea ssp cuspidata

Shrubs are often considered competitive barriers for seedlings planted in reforestation programs, although they can facilitate tree recruitment, especially in ecosystems under high abiotic stress. An alternative reforestation technique using pioneer shrubs as nurse-plants for Olea europaea ssp. cuspidata was tested in exclosures in northern Ethiopia. Seedlings were planted in three different microhabitats, and their survival was monitored. The microhabitats were bare soil patches between shrubs, patches under the dominant shrub Acacia etbaica, and patches under Euclea racemosa, an evergreen shrub, which supports the majority of naturally established Olea recruits. The ability of shrubs to offer protection against browsing goats was tested experimentally. Controlled shading was used to determine whether solar irradiation causes seedling mortality in environments without water stress. Data were analyzed using Kaplan-Meier survival analysis, Kruskal-Wallis analysis of variance (ANOVA), and one-way ANOVA. Olea survival was significantly higher and shoot damage by goats was lower when planted under shrub cover compared to bare soil patches, particularly under Euclea canopies, although high shade levels reduced seedling performance. Reduction of solar radiation by shrub canopies and thus control of soil-water evaporation and seedling transpiration most likely controlled the observed facilitation. Planting under shrubs may increase seedling survival and assist regeneration of dry Afromontane vegetation. Preserving pioneers also reduces soil erosion and conserves biodiversity. Excluding livestock is essential for Olea woodland restoration and allows persistent but morphologically modified Olea shrubs to develop vigorous regrowth. Facilitative processes are guiding principles for assisted forest restoration, but above-average rains may be critical to restore higher biomass levels in semiarid areas