Underexploited tropical plants with promising economic value " . Washington , D. C. , 1975. 188 p . " Making aquatic weeds useful : some perspectives for developing countries " . Washington , D.C. , 1976 . 175 P. " Leucena : promising ...

Making aquatic weeds useful : Some perspectives for developing countries . Washington . 174 p . 22. RAMIREZ , C .; BECK , S. 1981. Makrophytische Vegetation und Flora in Gewässern der Umgebung von La Paz , Bolivien .

United Nations . 1978. p . 22-23 . Development and Transter cf Technology Series . c . 7. * XL . Energy . National Academy of Sciences . Making aquatic weeds tseful : some perspectives for developing countries .

Lae , Papua Nueva Guinea , Appropriate Technology Development Institute , s.f. p . irr . ... ( 1796 NATIONAL ACADEMY OF SCIENCES , WASHINGTON , D.C. Making aquatic weeds usefull : some perspectives for developing countries .

Making aquatic weeds tseful : sone perspectives for developing countries . Washingter , IC ( EUA ) . 1976. Į . 108-112 . * XL . C195 Energy alternatives · a comparitive analysis . Norman ( FCA ) . University of Oklahoma . 1975. sp .

The soil in most of the pineapple producing areas is a deep , excessively drained sand ( Regosols ) , which consist of stratified , unconsolidated white quartz sand deposits on ground water podzols . This soil is very poor in plant ...

Infected flowers and diseased seeds may form a source of inoculum for secondary infection of seeds developing on healthy plants . Wind , rain and insects were important factors contributing to the spread of the disease .