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This book focuses on early germination, one of maize germplasm most important strategies for adapting to drought-induced stress. Some genotypes have the ability to adapt by either reducing water losses or by increasing water uptake. Drought tolerance is also an adaptive strategy that enables crop plants to maintain their normal physiological processes and deliver higher economical yield despite drought stress. Several processes are involved in conferring drought tolerance in maize: the accumulation of osmolytes or antioxidants, plant growth regulators, stress proteins and water channel proteins, transcription factors and signal transduction pathways. Drought is one of the most detrimental forms of abiotic stress around the world and seriously limits the productivity of agricultural crops. Maize, one of the leading cereal crops in the world, is sensitive to drought stress. Maize harvests are affected by drought stress at different growth stages in different regions. Numerous events in the life of maize crops can be affected by drought stress: germination potential, seedling growth, seedling stand establishment, overall growth and development, pollen and silk development, anthesis silking interval, pollination, and embryo, endosperm and kernel development. Though every maize genotype has the ability to avoid or withstand drought stress, there is a concrete need to improve the level of adaptability to drought stress to address the global issue of food security. The most common biological strategies for improving drought stress resistance include screening available maize germplasm for drought tolerance, conventional breeding strategies, and marker-assisted and genomic-assisted breeding and development of transgenic maize. As a comprehensive understanding of the effects of drought stress, adaptive strategies and potential breeding tools is the prerequisite for any sound breeding plan, this brief addresses these aspects.
Maize is a staple cereal after wheat and rice. It is an important source of carbohydrate, protein, iron, vitamin B and minerals for many poor people in the world. In developing countries maize is a major source of income in resource-poor farmers. As maize is used both as silage and as crop residue and the grains of maize are usually used for food, starch and oil extraction industrially, the demand for maize is rising day by day. Therefore, it is imperative for improvement of maize to meet the increasing demand. This book entitled "Maize - Production and Use" highlights the importance of maize and the improved management approaches for improving the productivity of maize in the era of changing climate.
Roughly a billion people around the world continue to live in state of chronic hunger and food insecurity. Unfortunately, efforts to improve their livelihoods must now unfold in the context of a rapidly changing climate, in which warming temperatures and changing rainfall regimes could threaten the basic productivity of the agricultural systems on which most of the world’s poor directly depend. But whether climate change represents a minor impediment or an existential threat to development is an area of substantial controversy, with different conclusions wrought from different methodologies and based on different data. This book aims to resolve some of the controversy by exploring and comparing the different methodologies and data that scientists use to understand climate’s effects on food security. In explains the nature of the climate threat, the ways in which crops and farmers might respond, and the potential role for public and private investment to help agriculture adapt to a warmer world. This broader understanding should prove useful to both scientists charged with quantifying climate threats, and policy-makers responsible for crucial decisions about how to respond. The book is especially suitable as a companion to an interdisciplinary undergraduate or graduate level class.
Abstract: This paper examines whether the choice of crops is affected by climate in Africa. Using a multinomial logit model, the paper regresses crop choice on climate, soils, and other factors. The model is estimated using a sample of more than 7,000 farmers across 11 countries in Africa. The study finds that crop choice is very climate sensitive. For example, farmers select sorghum and maize-millet in the cooler regions of Africa; maize-beans, maize-groundnut, and maize in moderately warm regions' and cowpea, cowpea-sorghum, and millet-groundnut in hot regions. Further, farmers choose sorghum, and millet-groundnut when conditions are dry; cowpea, cowpea-sorghum, maize-millet, and maize when medium wet; and maize-beans and maize-groundnut when wet. As temperatures warm, farmers will shift toward more heat tolerant crops. Depending on whether precipitation increases or decreases, farmers will also shift toward drought tolerant or water loving crops, respectively. There are several policy relevant conclusions to draw from this study. First, farmers will adapt to climate change by switching crops. Second, global warming impact studies cannot assume crop choice is exogenous. Third, this study only examines choices across current crops. Future farmers may well have more choices. There is an important role for agronomic research in developing new varieties more suited for higher temperatures. Future farmers may have even better adaptation alternatives with an expanded set of crop choices specifically targeted at higher temperatures.
Contents 1. Maria Isabel Andrade: Sweetpotato Breeder, Technology Transfer Specialist, and Advocate 1 2. Development of Cold Climate Grapes in the Upper Midwestern U.S.: The Pioneering Work of Elmer Swenson 31 3. Candidate Genes to Extend Fleshy Fruit Shelf Life 61 4. Breeding Naked Barley for Food, Feed, and Malt 95 5. The Foundations, Continuing Evolution, and Outcomes from the Application of Intellectual Property Protection in Plant Breeding and Agriculture 121 6. The Use of Endosperm Genes for Sweet Corn Improvement: A review of developments in endosperm genes in sweet corn since the seminal publication in Plant Breeding Reviews, Volume 1, by Charles Boyer and Jack Shannon (1984) 215 7. Gender and Farmer Preferences for Varietal Traits: Evidence and Issues for Crop Improvement 243 8. Domestication, Genetics, and Genomics of the American Cranberry 279 9. Images and Descriptions of Cucurbita maxima in Western Europe in the Sixteenth and Seventeenth Centuries 317
Risk and uncertainty are inescapable factors in agriculture which require careful management. Farmers face production risks from the weather, crop and livestock performance, and pests and diseases, as well as institutional, personal and business risks. This revised third edition of the popular textbook includes updated chapters on theory and methods and contains a new chapter discussing the state-contingent approach to the analysis of production and the use of copulas to better model stochastic dependency. Aiming to introduce agricultural decision making, probability and risk preference, this book is an indispensable guide for students and researchers of agriculture and agribusiness management.
Introduction to decision analysis. Probability. Revision of probalities. Utility. Procedures for decision analysis. Production under risk. Whole-farm planning under risk. Investment appraisal. Decision anlysis with preferences unknown.
Despite growing concerns over the impact of risk exposure on household welfare, adoption rates for technologies that seek to make vulnerable households more resilient are often underwhelming. In this dissertation, I draw on the construct of locus of control to consider the possibility that the same risks that motivate public investment in resilience-enhancing technologies might make vulnerable decision-makers unwilling to adopt them. The locus of control construct has a long history in psychology but has receive relatively little attention in economics. In Chapter 1, I demonstrate its conceptual relationship to neoclassical choice and derive its implications for investment behavior. I hypothesize that locus of control affects a decision-maker's perception of the production function. Further, I suggest that a more external locus of control -- the belief that forces outside of a decision-maker's control play a relatively large role in determining outcomes – depresses the perceived marginal product of investment, leading to lower investment levels. In Chapter 2, I describe the elicitation and properties of two locus of control measures among a population of maize-producing households in Eastern Africa. In addition to a standard, general locus of control measure common in the psychology literature, I develop and study a measure of locus of control specific to rainfed maize production. Using three years of primary data from 3,000 maize producers in Mozambique and Tanzania, I present evidence that locus of control does not reflect differences in preferences or subjective probabilities, but rather beliefs about the production function itself. In the final chapter, I study the predictive potential of locus of control. I show that farmers with a more external locus of control are significantly less likely to use improved maize varieties. They are also less likely to adopt new, drought-tolerant maize (DTM) varieties in response to a randomized marketing intervention. DTM technology was explicitly developed to reduce weather risk. The decreased willingness of vulnerable farmers to adopt DTM suggests that, in addition to its direct negative effects on well-being, risk exposure may limit the ability of vulnerable decision-makers to take advantage of important, technology-based mitigation strategies. The dissertation concludes by highlighting avenues for future research and considering the broader implications of the conceptual and empirical discussions of the preceding chapters.