BOLETIM DA FACULDADE DE CIÊNCIAS AGRÁRIAS DO PARÁ, n. 21, dez. 1993

Abstract

1) We carry out surveys of Cedrela odorata L. Une planting and anderson group planting with Carapa guianensis Aubl., located at the Curuá- Una experimental Station, Center of Timber Technology (CTM) of the Superintendency of Amazonian Development. The results were compared with others results in the tropics. We concluded that the initial growth ofthe Meliaceae need to be stimulate to avoid the Hypsipyla grandella Zeller attack.

2) The unicellular alga Nitzschia sp. was tested its cultores with different media, here refered to as "A", "B", "C" and "D", to determine growth curves of this which has the potential to serve as substrate for shrimp-farming. Culture médium "A" was seento be the most economically viable, with the algae reaching a concentration of 6183, 33 x I0000 cells/ml in the 8th day of exponential growth. The poorest medium was "B", with a corresponding concentration of 1883,33 x I0000 cells/ml in the 8 th day.

3) The paper discusses methods of data analysis from continous forest inventories. An example is given of a forest assessment carried out on five occasion analyzed by the Split Plot Univanate Methods.

4) The paper discusses the application ofthe Ratio Estimates Method in the analysis of forest inventaries in tropical forests and analyses the real results of field survey which gave an efficience of 109,8%,

5) The Bragantina Region, placed at northeast of Pará State, has an area of 16.428 km2, with climate oftypes Afi and Ami, in Koppen classification. Regional geology is represented by Quatemary that recovers the Pirabas and Pebas formation mainly. The soils of this region are Yellow Latosols medium texture dominantly. In order to determinate the P forms, two profiles and seventeen superficial samples ofYellow Alie Latosol médium texture were made, under bushy vegetation of Marapanim and Curuça areas. In P fractionation, the MEHTA methos et al., modified by VIEIRA, that consisls in elimination of cations through the strongly acid exchanged resin was used. The results showed low rates of ali P kinds and values very near between inorganic P (59%) and organic P (41 %) in a proportion of 1,5:1 respectively. The total P has presented mediai values of 110ppm, Also the analyses have shown there be relation between content of soils clay and total P, and also inorganic P.