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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Showing items 1 through 9 of 572.-
Library ResourceArticles et Livresdécembre, 1982
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Library ResourceArticles et Livresdécembre, 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 ResourceArticles et Livresdécembre, 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 ResourceArticles et Livresdécembre, 1985Colombie, Amérique centrale, Amérique du Sud
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 ResourceArticles et Livresdécembre, 1994Colombie, Amérique centrale, Amérique du Sud
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Library ResourceArticles et Livresdécembre, 1987Indonésie, Asie, Asia du sud-est
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 ResourceArticles et Livresdécembre, 1997
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Library ResourceArticles et Livresdécembre, 1997Brésil, Amérique centrale, Amérique du Sud
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Library ResourceRapports et recherchesdécembre, 2017Kenya, Nigéria, Ouganda, Burundi, Madagascar, Zimbabwe, République-Unie de Tanzanie, Soudan, Ghana, Éthiopie, Malawi, Afrique sub-saharienne, Afrique, Afrique orientale
Our goal is to provide the scientific basis for development investments and policies that promote more productive, profitable agriculture, and healthier diets at no environmental cost. Low-income, smallholder farmers face significant challenges across sub-Saharan Africa (SSA). High population growth is coinciding with migration to the cities as younger populations seek out higher income-earning opportunities. Inadequate infrastructure and few markets for agricultural production in rural areas, for example, are leading to stagnated opportunities for smallholders.
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Library ResourceRapports et recherchesdécembre, 2017Kenya, Afrique orientale, Afrique
The International Center for Tropical Agriculture (CIAT), in collaboration with our national research partners, has been working in Africa for the last 30 years. Our cutting-edge science helps policy makers, private sector, scientists, civil society, and farmers respond to the most pressing challenges of our time.
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