RESUMO:A forma de manejo que se utiliza nos solos amazônicos determina a sua utilização no futuro, assim a caracterização química é fundamental, pois é parâmetro para indicar a fertilidade desses solos. O objetivo deste trabalho foi realizar a caracterização química de diferentes usos de solos no estado do Pará. Foram coletadas quinze amostras simples para formar três amostras compostas com três repetições para cada área nos solos de várzea, capoeira e capoeira em transição para várzea com ampla faixa de variação de características químicas. CHEMICAL CHARACTERIZATION OF DIFFERENT SYSTEMS OF LAND USEABSTRACT: The form of management that is used in Amazonian soils determines its use in the future, so the chemical is critical, as is a parameter to indicate the fertility of these soils. The aim of this work was the chemical characterization of different land uses in the state of Pará were collected fifteen samples simple to form three composite samples with three replicates for each area in lowland soils, poultry and poultry in transition to floodplain with a wide range variation of chemical characteristics. Analyses were carried out in the department of soils in Universidade Federal Rural da Amazônia (UFRA). The following analyzes were performed: The pH, calcium, exchangeable magnesium, exchangeable aluminum and moisture content. Regarding pH, showed marked all soil acidity. As for humidity, lowland soil that was presented greater. For Ca 2+ and Mg 2+ , the lowland soils that were also presented higher values.
This research aimed to characterize the biometry of seeds, the morphology of seedlings and to evaluate the initial growth of blue jacaranda trees (Jacaranda mimosifolia D. Don.) in two environments with distinct luminosity. The biometry of 100 de-winged seeds was measured by their length, width and thickness. One hundred seeds were sown into 300 cm3 tubes and seedlings morphology was registered throughout the germination process using digital photographs disposed sequentially according to seedlings age. The initial growth analysis was performed in two environments, full sun and greenhouse, during nine periods, and arranged in a complete randomized design with subplots. The response variables were: number of leaves, plant height, collar diameter, root length, aerial and roots dry weight, and Dickson’s Quality Index (DQI). Biometry results showed seeds 7.09 - 9.26 mm long, 6.74 -9.39 mm wide, and 1.11 -1.89 mm thick. Germination is of hypogealphanerocotylar type, with first root arising six days after sown. Plants at full sun presented larger collar diameters, greater root dry weight and higher DQI as evaluation periods passed by. In conclusion, the biometry of seeds and the morphology of seedlings of blue jacaranda can be used to recognize this species in the field. Plants at full sun presented better development. Seedlings cultivated at full sun can be destined to recuperate forests and degraded areas just 36 weeks after sowed.
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