This National Academy of Sciences report describes plants of the family Leguminosae, all of them greatly underexploited. Some are extensively used in one part of the world but unknown elsewhere; others are virtually unknown to science but have particular attributes that suggest they could become major crops in the future; a few are already widespread but their possibilities are not yet fully realized.Most of the plants described in this book have the capacity to provide their own nitrogenous fertilizer through bacteria that live in nodules on their roots; the bacteria chemically convert nitrogen gas from the air into soluble compounds that the plant can absorb and utilize. As a result, legumes generally require no additional nitrogenous fertilizer for average growth. This is advantageous because commercial nitrogenous fertilizers are now extremely expensive for peasant farmers. This report demonstrates how farmers in developing countries, by using leguminous plants, can grow useful crops while avoiding that expense. However, the plants to be discussed here should be seen as complements to, not as substitutes for, conventional tropical crops.

Tropical Diseases of Legumes consists of papers presented at a workshop held at Rio Piedras Agricultural Station, University of Puerto Rico, in June 1974. Legumes are group of plants that provide an important and often sole source of protein in the diet of millions of people. In the growing problem of hunger, there is an immediate need to raise the production of legumes through better knowledge of plant diseases, by ultimate prevention of these diseases, and through improved crop production. Consequently, a workshop is organized and the presented papers, grouped into four parts, are shown in this book. The first two parts describe the rugaceous and mosaic diseases. Bacterial diseases, chemical control, and ecology of pathogens are explained in the third part of this book. The last part explores the origin and improvement of the common bean, as well as its diseases in the tropical Americas. This book aims to provide a stimulating forum for discussion of the findings and observations in tropical legume disease research.

"Recently, there has been tremendous progress in the genetic transformation of agricultural crops, and plants resistant to insects, herbicides, and diseases have been produced, field tested and patented. Transgenic Crops I compiles this information on cereals, grasses, legumes, and oilseed crops." "This book is of special interest to advanced students, teachers, and research workers in the field of plant breeding, genetics, molecular biology, plant tissue culture, and plant biotechnology in general."--BOOK JACKET.Title Summary field provided by Blackwell North America, Inc. All Rights Reserved

The grasses. Classification and distribution. Environment in relation to some aspects of grass physiology. Day length. Light intensity. Temperature. Rainfall. Soils. The structure of the grass plant. Cultivation. Establishment. Management. Association with the legumes. Herbage yields. Conservation. Nutritive value. Reproduction. The structure of floral parts. Flowering and pollination. Fertilization. Apomixis. Seed. Seed germination. Seed production. The more important species. The legumes. Classification and distribution. The structure of the leguminous plant. Nitrogen fixation by the legumes. In mixture with the grasses. Cultivation. Pests and diseases. Yields, utilization. Chemical composition, nutritive value. Palatability, toxicity. Reproduction. The flowers. Flowring, pollination. Seed production and harvesting. Breeding. The more important species.

The development of legume use in agricultural production in the tropics lags far behind the temperate areas and extensive research over recent decades has aimed to rectify the lack of available leguminous fodder species available for heavy clay soils. This book draws together that research and explores the importance of heavy clay soils to agricultural productivity in the tropics and subtropics and the identification of adapted, productive forage legumes for these environments. Providing an invaluable example of how a global search for adapted and productive forage germplasm has been - and can be - undertaken, and allowing access to a significant body of knowledge that was acquired before the digitalization of reports, this book will be a key resource for new scientists and experienced researchers in the areas of agriculture and forage agronomy.

In 1971, Dr. Quentin Jones, now of the National Hawaii, where an international panel convened to Program Staff, SEA, USDA, suggested that the discuss and assemble information on underexploit Plant Taxonomy Laboratory devise a format for ed tropical legumes. Conversations at that meeting concise write-ups on 1,000 economic plants (Duke and subsequent correspondence with the partici and Terrell, 1974; Duke et al. , 1975). Dr. C. F. pants also yielded new information on some of the Reed was contracted to search the literature on tropical legumes. Finally in 1978, 100 copies of the writeups these economic plants, which included 146 species of legumes. From 1971 through 1974, Dr. Reed were delivered to the International Legume Con prepared rough drafts of write-ups on the 1,000 ference at Kew, July 24th-August 4, and all were species. It was my responsibility to establish the given to potential cooperators before my lecture on format and monitor the write-ups, to ensure that the manual (July 31st). New information presented they would answer many questions on legumes in lectures at that conference and personal com directed to the USDA by our taxpaying public. munications behind the scenes have also been used Since then, a computerized system alerts me to to update and embellish the write-ups so that they new publications on legumes. I have ordered for are more than a bibliographic echo. our files copies of the more promising documents.

Nitrogen fixation by leguminous plants is especially important when farmers are trying to minimise fertilizer use for cost or environmental reasons. This second edition of the highly successful book, first published in 1991, contains thoroughly updated and revised material on the theory and practice of nitrogen fixation in tropical cropping systems.