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Showing items 1 through 9 of 755.-
Library ResourceJournal Articles & BooksDecember, 2018Colombia, Central America, South America
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Library ResourceJournal Articles & BooksDecember, 1997Sub-Saharan Africa
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Library ResourceJournal Articles & BooksDecember, 1982
Chemical analysis and missing element trials with Sorghum vulgare L. showed that three Panamanian soils, representative of three great soil groups, were deficient in both nitrogen (N) and phosphorus (P). When a greenhouse trial was undertaken to test the response of Cajanus cajan to rhizobial inoculation, N and P fertilization in these soils, no response was obtained in either the Río Hato or Los Santos soils. There was a definite response to P and a slight response to inoculation in the Pacora soil, which had the poorest fertility level. N applications depressed nodulation.
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Library ResourceJournal Articles & BooksDecember, 1982
This paper reviews the experimental basis for the lectin-recognition hypothesis and considers ways in which the host/Rhizobium interaction might be manipulated to enhance the benefits of symbiotic nitrogen fixation in the tropics.
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Library ResourceJournal Articles & BooksDecember, 1982
Biological nitrogen (N2) fixation in both free-living and symbiotic organisms is an energy-requiring process dependent upon a supply of carbon and energy. In this paper the energy costs for N2 fixation and nodule respiration in symbiotic systems are compared with those of free-living N2-fixing systems, with the theoretical energy requierement for N2 fixation, and with the cost of utilization of combined N.
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Library ResourceJournal Articles & BooksDecember, 1985Colombia, Central America, South America
The factors influencing the size and shape of exptl. field plots (area of exptl. lot, soil types, trial objective, no. of replicates, and degree of accuracy and homogeneity of the exptl. material) for the execution of field expt. are discussed. The basic principles of the following different methods to determine plot size are described: max. curve method, method of Koch and Rigney, Hatheway's method, and the max. curve method using the multiple linear regression model. Some considerations are presented on the border effect and on plot size in bush and climbing bean trials.
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Library ResourceJournal Articles & BooksDecember, 1994Colombia, Central America, South America
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Library ResourceJournal Articles & BooksDecember, 1987Indonesia, Asia, South-Eastern Asia
This analysis of global and Asian markets looks at protectionism and substitution (decline in starch trade, rise in trade of cassava feedstuffs) and the Asian regional market for cassava feedstuffs. The degree of substitution between cassava and grains has increased measurably during the postwar period. Cassava's future in world markets depends on its ability to compete with grains; so far this has depended on grain pricing policies and tariff structures of importing countries, making cassava trade more vulnerable than the international grain trade.
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Library ResourceDecember, 2018Kenya, Eastern Africa, Africa
International Non-Governmental Organizations have popularized payment for ecosystem services (PES) because of their potential to simultaneously achieve rural development and ecological conservation goals (GEF Secretariat 2014). Despite their rapid diffusion, there is insufficient assessment of their potential implications for social and economic stratification (Redford and Adams 2009). Indeed, there is growing evidence that PES may reproduce or even exacerbate existing inequalities in social development and resource access (Kosoyand Corbera2010, Porras 2010).
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Library ResourcePolicy Papers & BriefsDecember, 2018Burkina Faso, Africa, Western Africa
This policy brief aims to give an overview of land degradation hotspots in Burkina Faso and the policy options for land restoration. In this assessment, land degradation is referred to as the persistent loss of ecosystem function and productivity caused by disturbances from which the land cannot recover without human intervention (unaided). Hotspots are defined as places that experience high land degradation and if left unattended, will negatively affect both human wellbeing and the environment.
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