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Improved pest (including disease and weed) management through integrated pest management (IPM), including judicious pesticide use (Oerke and Dehne, 2004; Williamson et al., 2008) but relying primarily on interventions supporting crop health and discouraging pest outbreaks (such as through intercropping and use of ‘push-pull’ systems to attract and trap pests (Khan et al., 2011)), have seen growing effectiveness and acceptance among farmers. Climate change may offer new cost-effective opportunities for African smallholder farmers to combine the appropriate choice of crops and שקיות קנאביס רפואי improved varieties with suited management options such as modified planting dates and fertilizer use to mitigate climatic effects (e.g., Waha et al., 2013; Rurinda et al., 2014). Future climate change will likely be especially damaging to maize yields in Sub-Saharan Africa, exacerbating the severity of several biotic and abiotic constraints, including high temperatures, drought and pests, and reducing the areas where maize can be grown. Advances in crop breeding also help to alleviate some environmental constraints and possibly reduce negative environmental impacts of crop production – although to date the effectiveness of modern varieties for advancing smallholder productivity has been mixed and there is little evidence that they reduce environmental impacts of cropping. Improved pre-production decisions, including sparing marginal lands and ecologically important areas from cropping, as well as efforts to reduce post-harvest losses through improved storage methods and facilities (World Bank, 2011; Tefera, 2012) are additional general considerations to mitigate environmental impacts that apply across the crops and regions.
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Soils are formed by the disintegrations & decomposition of parent rocks due to weathering and the action of soil organisms & also the interaction of various chemical substances present in the soil. When we speak of free software, we are referring to freedom, not price. Though biofuels are a potential low-carbon energy source, the conversion of rainforests, peatlands, and savannas to produce biofuels in the US, Brazil and South East Asia may actually release more carbon dioxide than the reductions in greenhouse gases brought about by using biofuels as an energy source. Some progress has been made to breed and use maize with better tolerance to drought and high temperatures (Banziger et al., 2006; Shiferaw et al., 2011; Cairns et al., 2013), but larger improvements are needed as maize production is likely to be substantially constrained by these abiotic stresses in Sub-Saharan Africa and South Asia. Biofuels (which include biodiesel from palm oil and ethanol from sugarcane, corn and soya-bean) have become prominent given the circumstances of high oil prices and the initial perception that they are environmentally friendly in reducing carbon dioxide emissions.
