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Showing items 1 through 9 of 1979.
  1. Library Resource
    Journal Articles & Books
    December, 2011
    Sub-Saharan Africa, Africa

    Grain legumes occupy about 20 million hectares in Africa. The major crops are cowpea (Vigna unguiculata L.), which is grown on about 11 million hectares mostly in West Africa, and common bean (Phaseolus vulgaris L.), grown on about 5 million hectares mostly in eastern and southern Africa. These grain legumes have impacted soil organisms, including nitrogen fixers, mycorrhizae, fauna, and the processes that they perform. The legume-Rhizobiumsymbiosis results in dinitrogen (N2) fixation that adds plant-available nitrogen to the soil system.

  2. Library Resource
    Reports & Research
    December, 2011

    In April of 2010, Drs. Mario Herrero and Philip Thornton of the International Livestock Research Institute contracted with Drs. Boone and Conant to create a global rangeland model of moderate complexity. Boone was funded for a 50 day effort, and Conant for ca. 40 days. An opportunity to prepare a manuscript for a special issue of the Proceedings of the National Academy of Science arose, and Conant took the lead in that effort. Boone created the rangeland model, called G-Range, with input from Conant, drawing upon existing models and new information (see Acknowledgements).

  3. Library Resource
    Journal Articles & Books
    December, 2011

    Global food demand is increasing rapidly, as are the environmental impacts of agricultural expansion. Here, we project global demand for crop production in 2050 and evaluate the environmental impacts of alternative ways that this demand might be met. We find that per capita demand for crops, when measured as caloric or protein content of all crops combined, has been a similarly increasing function of per capita real income since 1960. This relationship forecasts a 100–110% increase in global crop demand from 2005 to 2050.

  4. Library Resource
    Reports & Research
    December, 2011
    Kenya, Tanzania, Uganda, Africa, Eastern Africa

    Climate-induced livelihood transitons in the agricultural systems of Africa are increasingly likely. There has been only limited study on what such transitons might look like, but it is clear that the implicatons could be profound in relaton to social, environmental, economic and politcal efects at local and natonal levels.

  5. Library Resource
    Journal Articles & Books
    December, 2011
    Kenya, Africa, Eastern Africa

    Populations of Legume Nodulating Bacteria (LNB) were assessed under glasshouse conditions in soils collected from selected landuse systems in Taita Taveta district, Kenya. The populations were estimated by the most-probable-number (MPN) plant infection technique using Macroptilium atropurpureum (DC.) Urban (siratro) as the trap plant. The LNB populations varied from 1.1 × 10 to 6.1 × 106 cells g-1 of soil. There was apparent landuse effect on abundance of LNB with maize-bean cropping system and shrubland giving high population estimates.

  6. Library Resource
    Journal Articles & Books
    December, 2011
    Nicaragua

    Significant cocoa production in the municipality of Waslala, Nicaragua, began in 1961. Since the 1980s, its economic importance to rural smallholders increased, and the region now contributes more than 50% of national cocoa bean production. This research aimed to assist local farmers to develop production of high-value cocoa based on optimal use of cacao biodiversity. Using microsatellite markers, the allelic composition and genetic structure of cacao was assessed from 44 representative plantings and two unmanaged trees.

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