Efeito da calagem e disponibilidade de nutrientes no desenvolvimento inicial do Pinhão Manso (Jatropha curcas l.) em um Cambissolo

Abstract

The biofuels use comes today as alternative source of energy. Among the advantages of the job of the biofuels, there are the decrease of the emission of pollutant gases and decrease of the greenhouse effect. For the biofuels production, the culture of the tame physic comes as viable alternative, due to his rusticity, resistance to the drought and for being adaptable to a range of atmospheres. Before that, it was aimed at to evaluate the effect of the nutritional limitations in the initial development of plants of physic nut (Jatrophas curcas L.), in the absence and in the liming presence. The research was carried in the greenhouse of the Department of Agricultural Engineering and soils of the Federal University of Amazon, in Manaus/AM. Used samples of a Cambisol, collected of the layer of 0-30 cm of depth, under vegetation of natural fields. The treatments were disposed in design entirely randomozed with five repetitions, distributed in factorial arrangement (2 x 7), combining two conditions of acidity of the soil (I not sole corrected and corrected) and seven conditions of fertilization of the soil, which were: T-1 Controls (I sole natural); T-2 Controls with micronutrients (I sole natural fertilized with micronutrients); T-3 Complete (soil fertilized with N,P,K,S and micronutrients); T-4 Complete - N (soil fertilized with P,K,S and micronutrients); T-5 Complete - P (soil fertilized with N,K,S and micronutrients); T-6 Complete - K (soil fertilized with N,P,S and micronutrients); T-7 Complete - S (soil fertilized with N,P,K and micronutrients), totaling 70 experimental units. To the 70 days of transport of the experiment the plants were picked and appraised the following characteristics: height of plants, diameter stem, number of leaves, root length, production of dry matter of the aerial part and of the root, matter total drought, relationship root leaves aerial and content of nutrients in the matter dries of the aerial part. The results obtained in the conditions of the present study allowed to end that: It is done necessary the united correction of the acidity and of the fertility of the soil, because the same was classified of low natural fertility. Among the used nutrients P was what more limited the development of the plants and the accumulation of nutrients.