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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. -
BookletCorporate general interestStandard operating procedure for soil nitrogen - Kjeldahl method 2021
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No results found.This standard operating procedure (SOP) describes, in general terms, the quantification of the Kjeldahl nitrogen(KjN) content in soil samples. The advantages of this method are based on its robustness, low initial cost of the equipment and extensive application. However, there are disadvantages in using this method compared to others, for example, the use of potentially hazardous reagents that require consideration for safe operation are utilized, alongside the generation of hazardous waste and on-going cost of consumables, which can be mitigated via modified protocols that use lower quantities of reagents. Another limitation of this method is that it measures organic N and mineral N in the form of ammonium cation (NH4+), therefore, to measure the total N, the mineral N in the form of NO3- must be measured separately -
BookletCorporate general interestStandard operating procedure for soil available phosphorus - Bray I and Bray II method 2021
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No results found.P-Bray 1 and P-Bray 2 methods are normally limited to acid soils with water pH values less than 6.8. The P-Bray 1 Method removes a fraction of the “adsorbed” phosphorus (Al-P, Fe-P, Mn-P and Ca-P but less efficient) while the P-Bray 2 Method is best suited to acid soils where rock phosphate has been the primary P fertilizer source and/or the major portion of P exists in the soil in various forms of calcium phosphate. Bray extractants should not be used on alkaline soils because the acid tends to be neutralized and/or excessive calcium phosphates may be extracted, giving a false high test for available P.