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Brochure, flyer, fact-sheetBrochureStandard operating procedure for soil available phosphorus - Olsen method 2021
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No results found.This procedure is suitable for calcareous, alkaline, neutral, and slightly acidic soils containing CaPO4, since the calcium concentration in the solution is suppressed by the precipitation of CaCO3, increasing PO4 concentration in solution. Neutral and slightly acid soils (pH 6.0 to 7.0) may contain both Ca- and Al-phosphates. The NaHCO3 extractant can remove Ca-phosphates and phosphate adsorbed on the surface of calcium and magnesium carbonates along with Al-phosphates and is considered the most suitable extractant for these soils. -
Book (series)Technical studyTaro cultivation in Asia and the Pacific 1999
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No results found.Taro, Colocasia esculenta (L.) Schott occupies a significant place in the agriculture of the Asia-Pacific Region. It is in this region, more than any other in the world, that the crop attains its greatest importance as a staple food. In Oceania particularly, taro plays a critical role in the household, community, and national food security. Since both corms and leaves are usually consumed, taro supplies much-needed protein, vitamins, and minerals, in addition to carbohydrate energy. The socio-cultural importance of taro in the region is very high. The crop has evolved to be an integral part of the culture and features prominently in festivals, social gift-giving, and the discharge of social obligations. More recently, taro has become a source of income for individuals, and an earner of foreign exchange. Its role in rural development has therefore been increasing, especially with respect to the provision of employment and the alleviation of rural poverty. Given the importance of taro, activities need to be geared toward its research, development, and available literature. This book is, therefore, a valuable and timely effort to fill some of the information gaps with respect to taro in the Asia-Pacific Region. Apart from a general coverage of the region, it delves into a country-by-country treatment of taro cultivation in 19 of the most important taro-growing countries in the region. The publication will be a useful reference source for researchers, extension workers, growers, and entrepreneurs who are interested in taro. The presentation has placed emphasis on clarity and simplicity to permit easy understanding even by persons for whom English is a second language. -
Book (series)Technical studyThe impact of climate variability and extremes on agriculture and food security - An analysis of the evidence and case studies
Background paper for The State of Food Security and Nutrition in the World 2018
2020Also available in:
No results found.Global climate studies show that not only temperatures are increasing and precipitation levels are becoming more varied, all projections indicate these trends will continue. It is therefore imperative that we understand changes in climate over agricultural areas and their impacts on agriculture production and food security. This study presents new analysis on the impact of changing climate on agriculture and food security, by examining the evidence on recent climate variability and extremes over agricultural areas and the impact of these on agriculture and food security. It shows that more countries are exposed to increasing climate variability and extremes and the frequency (the number of years exposed in a five-year period) and intensity (the number of types of climate extremes in a five-year period) of exposure over agricultural areas have increased. The findings of this study are compelling and bring urgency to the fact that climate variability and extremes are proliferating and intensifying and are contributing to a rise in global hunger. The world’s 2.5 billion small-scale farmers, herders, fishers, and forest-dependent people, who derive their food and income from renewable natural resources, are most at risk and affected. Actions to strengthen the resilience of livelihoods and food systems to climate variability and extremes urgently need to be scaled up and accelerated.