Title:	Study on the mineral extraction of legume and grass species from various soil types, by instrumental neutron activation analysis.
Authors:	PIASENTIN, R. M. ARMELIN, M. J. A. PRIMAVESI, O. CRUVINEL, P. E.
Date Issued:	1998
Citation:	Journal of radioanalytical and nuclear chemistry, Budapest, v. 238, n. 1/2, p. 7-12, 1998.
Description:	There is a continuous search for forage species more adapted to the environmental conditions, like soil, climate and vegetation. The adaption study of grasses and legumes to different cultivation regions need, therefore, to consider climatic, soil and management parameters. 1 Besides this, the vegetal species, with their preferential accumulation of certain elements could be used as mineral contamination and depository indicators of the area where they grow, considering that the mineral composition of plants can reflect the chemical composition of the soil. 2 The extension in which this relation exists, is highly variable and governed by many factors. 3 Furthermore, with the appearance of the precision agriculture and the intensification of the agricultural production systems, we need a more precise knowledge of the mineral mobilization and extraction potential of plants used as green manure for cycling minerals, or by forage plants returned as faeces, or of the mineral exportation when plant parts are taken out of the growing place. And this not only with the essential minerals for plants and animals, but also with those introduced in the production systems as impurities in limestones, fertilizers etc., and which could accumulate to toxic levels in the soil. The aim of this work was to study the influence of soil on the quali and quantitative extraction of minerals by many legume and grass species, cultivated on two types of oxisols, a red yellow Latosol, and a dark red Latosol. Each soil was treated with grinded dolomitic limestone to increase the base saturation to 50% and 75%, to verify how the pH correction of the soil affect the elemental absorption by each vegetal species, and find the adequate limestone to reach the optimal plant production on each soil, to avoid unnecessary expenditure and eventual damage on mineral absorption. The analysed plant material could be used as food for animals, as source of organic material and recicled nutrients to soil and/or energy source for microorganisms, or also, to improve the physical, chemical and biological characteristics of the soil and be a mineral source. In view of the high sensitivity and possibility of multielemental analyses, instrumental neutron activation analysis (INAA) followed by gamma-ray spectrometry was used as a powerful analytic option to verify the chemical composition of different sources, 4-6 and to determine the K, Ca, Mg, Na, Zn, Fe, Mn, Mo, Co, Cr, La, Eu and Th content of the whole 90-day old plants (leaf, stalk and flowers).
Keywords:	Mineral extraction Legume species Grass species
Type of Material:	Artigo de periódico
Access:	openAccess
Appears in Collections:	Artigo em periódico indexado (CNPDIA)