Titlebook: Management of Biological Nitrogen Fixation for the Development of More Productive and Sustainable Ag; Extended versions of J. K. Ladha,M. B

BARB

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Sustainable agriculture in the semi-arid tropics through biological nitrogen fixation in grain leguhave reviewed the research on the contribution of grain legumes in cropping systems and the factors affecting BNF. Based on the information available, we have suggested ways for exploiting BNF for developing sustainable agriculture in the semi-arid tropics (SAT). A holistic approach involving host-p

Host142

Role of legumes in providing N for sustainable tropical pasture systems,s unlikely to be affected by inorganic soil N in the absence of N fertilizer. Thus an estimate of the amounts of N fixed could be obtained from simple estimates of legume biomass provided tissue levels of other nutrients such as phosphorus and potassium are adequate. Key factors for the achievement

BOLUS

Management of biological N2 fixation in alley cropping systems: Estimation and contribution to N bative samples and applying reliable methodologies for measuring N. fixed. Strategies for obtaining representative samples (as against the whole tree or destructive plant sampling), the application of .N procedures and the selection criteria for appropriate reference plants have been discussed.

instate

Green manure technology: Potential, usage, and limitations. A case study for lowland rice,he average amounts of N accumulated by green manures can entirely substitute for mineral fertilizer N at current average application rates..With similar N use efficiencies, green manure N is less prone to loss mechanisms than mineral N fertilizers and may therefore contribute to long-term residual e

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Biological nitrogen fixation associated with sugar cane and rice: Contributions and prospects for io be less than 8 kg N ha. crop.. The problems associated with the use of the .N dilution technique for BNF quantification are discussed and illustrated with data from a recent study performed at EMBRAPA-CNPAB. Although many species of diazotrophs have been isolated from the rhizosphere of both sugar

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