Balances of bioelements in useful tropical plants.

The productivity of different useful tropical plants is compared with respect to their biomass production. Furthermore, analyses of nutrient contents serve to explain the interrelationship between nutrient supply and primary production. The biomass and nutrient contents from three to six month old plants from Bertholletia excelsia H.B.K. (castanha-do-Brasil), Cedrela odorata L. (cedro vermelho), Dipteryx alata (cumaru), Theobroma grandiflorum (Spreng.) K. Schum. (cupuacu), Elaeis guineensis Jacq. (dende), Swietenia macrophylla King (mahogany), Sclerobium paniculatum Vogel (taxi branco) and Bixa orellana L. (urucum) within the different plant fraction were determined. The elements Ca, Mg, K, Na, Fe, Al, Zn, Cu, and P were analysed with the inductively coupled argon plasma with optical-emission-spectrometry (ICP-OES) method. Compared to plants of temperate regions, the mineral content is distinctly higher than that for tropical plants, but most values still lie within the range of existing data. Extremely high values were found for aluminium and iron

Biomass production and mineral element supply of selected useful tropical plants.

This current investigation is part of a cooperative project of CPAA-Manaus and Hamburg University entitled "Recultivation of degraded and abandoned monocultures instable mixed cultures with special reference to soil biological factors". In this study the biomass product and the mineral element supply of selected useful tropical plants will be determined. Parallel to it the availability of nutrient element in the soil will be analyzed. These experiments may allow an evaluation, in which way a sustainable growth of the suggested plant system under the prevailing site conditions is possible.Poster 11

Pest and disease incidence in agroforestry systems of the Brazilian Central Amazon.

In Central Amazonia there are no examples of pests or diseases whose incidence is reduced in agroforestry systems

Microbial biomass and activity in two cultivation systems on the SHIFT experimental area near Manaus.

In two different cultivation systems we investigated the microbial biomass and activity in the rhizosphere of Theobroma grandiflorum and Bactris gasipaes, two important crop plants in sustainable agriculture in Brazil during rainy and dry season 1998

Development and production of several tropical species in agroforestry systems in the Brazilian Central Amazonia during six years.

In the Central Amazonia, large land area nowadays are degraded and/or abandoned, which were previously used for shifting cultivation, pasture or monocultures. Agroforestry systems appear to be a good alternative to occupy these areas

Baumarten zum Aufbau nachlaltiger Mischkultursysteme in Zentralamazonien.

Tree species for the establishment of sustainable mixed culture systems in Central Amazonia

Produção de biomassa e fornecimento de nutrientes de plantas tropicais úteis selecionadas.

Made available in DSpace on 2020-03-13T01:05:48Z (GMT). No. of bitstreams: 1 Producaodebiomassaefornecimentodenutrientesdeplantastropicais.pdf: 1865572 bytes, checksum: 90c4cbab763f710baecf5dcef857c903 (MD5) Previous issue date: 1998bitstream/item/211760/1/Producao-de-biomassa-e-fornecimento-de-nutrientes-de-plantas-tropicais.pd

Produção de biomassa e fornecimento de nutrientes de plantas tropicais úteis selecionadas.

Determinacao da producao de biomassa e das reservas de nutrientes de plantas tropicais uteis. Paralelamente, foi analisada a disponibilidade de nutrientes no solo. Esses experimentos podem permitir avaliar a forma mais viavel de crescimento sustentavel dos sistemas de plantio sob as condicoes prevalentes dos sitios. Sao apresentados preliminares.bitstream/item/180861/1/Recuperacao-71-73.pd

Bactris gasipaes H.B.K.: production factors in agro-ecosystems.

According with the studies realized the litter from peach palm (pupunha) contibutes with only 110 g/ha or 0,1% of total soil C to the C budget of the system. On the other hand it produces high quantities of root exudates. About 16.500 kg/ha C or 15% of total soil C respectively are released into the soil. Taking into account the C loss by microbial respiration and root respiration peach palm contributes with 10.700 kg/ha or 10% of total soil C respectively to the C budget of the system. Compared to C from root exudates the quantity of C from microbial biobass under peach palm is low. Only 45 kg/ha or 0,0004% of the total C originate from the microbial biomass