Of the cleared areas , the dominant land use was , and continues to be , low productivity cattle pasture , over half ... being of people in the region and preserving the world's largest undisturbed area of primary tropical rainforest .

( 11525 ) LIETH , H. Biological productivity of tropical lands . Unasylva 28 ( 114 ) : 24-31 . 1976. 8 refs . ( 11526 ) LLOBET , E. Informe al Gobierno de Costa Rica sobre el perfeccionamiento del regimen de tierras con referencia ...

1967. 4 refs . ( 11524 ) LETOUZAY , Les arbres d'ombrage des plantations agricoles camerounaises . Bois et 1955 . Forets des Tropiques 42 : 15-25 . ( 11525 ) LIETH , H. lands . refs . R. Biological productivity of tropical Unasylva 28 ...

IICA is a pioneer in research and training related to the tropical areas of the Americas . ... resources and by offering a true alternative for economic reactivation and increased biological and physical productivity in the future .

Managed fallows are quite widespread in the Americas , producing biological and economic benefits , however , cases in which ... When land is scarce , tropical farmers shorten the forest fallows and lengthen the agricultural periods .

Reducing biological diversity may or may not affect biological productivity , community stability or ecological processes ... of Central America are considered lowland tropical rain forests ( 37 % of total land surface ) ( Figure 1 ) .

In the region's tropical countries , the conversion of forests to pasture lands is also an important trend - one best described in ... pasture land area , pasture productivity , cattle population , and biological carrying capacity .

ISRIC Annual Report 1985 : ISRIC Wageningen : 17-29 . Swift , M. J. and Sanchez , P.A. , 1984. Biological management of tropical soil fertility for sustained productivity . Nature and Resources ( UNESCO ) , vol . XX ( 4 ) : 2-10 .

The cassava root constitutes the food base for approximately 300 million people in the tropical regions of the world ... An evaluation was therefore made , in Turrialba , of the biological productivity ( biomass , nutritional energy and ...

BREEDING TO IMPROVE MILK PRODUCTION IN THE TROPICS The value of milk production in the tropics can easily be understood when ... deficiency of animal protein and the sub- utilization of abundant forage resources in most tropical areas .