Produção de adubos de liberação lenta utilizando a briquetagem de finos de calcário e melado de cana: estudos iniciais

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Universidade Federal de Goiás


Mineral agglomeration is a technique used to join mineral particles of fine granulometry. It aims to improve the conditions of application, storage and transport. The limestone, in turn, is a rock composed mainly of calcium and widely used as soil corrective, since it has the capacity to raise the pH of acid soils, besides providing Ca and Mg to the plants. Acidic soils are harmful to the full development of plants, since they negatively interfere with the absorption of nutrients. Brazil is the largest producer of sugarcane in the world, presenting great potential in the production of sugarcane molasses. On the other hand, the molasses, besides being an efficient agglomerant, also presents capacity of fertilization, since it has in its composition minerals essential to the plants, as it is the case of Fe, Ca, K, Na, P, Mg and Cl. Slow release fertilizers are those that gradually make nutrients available to plants. These fertilizers are proven to be more efficient than traditional ones because they are less susceptible to nutrient leaching, avoiding losses and contamination. In addition, large deforestation caused in our biomes, whether by agricultural exploration or urban growth, together with greater control of the environmental preservation areas generated by law 12.727 of 2012, create a potential growth in the demand for seedlings of native plants, the main niche application of slow release fertilizers. Thus, this work aims to propose, through preliminary tests, the creation of a slow - release fertilizer, composed of limestone (<400 #) and cane molasses, generated from mineral agglomeration by briquetting. For this, the generated briquettes were submitted to tests of mechanical resistance, such as tests of resistance to fall, compression and water action. The technical parameters of briquetting were used that presented better results in the resistance tests, according to existing works. The pressure used for briquetting is 3 tons for a time of 50 seconds. The briquettes were made in two different sizes, depending on the mass of limestone used, of 5 and 7.5 g. The percentage of cane molasses used was 8.5% of the limestone mass. The effect of curing time on the resistance of these briquettes was also analyzed, ranging from zero, five and ten days. The results showed that there is an increase in resistance of the briquettes with the curing process. The loss of moisture generated with the cure allows the crystallization of the sucrose, which contributes to the greater hardening of the briquettes. The higher resistance is reflected in the increase of degradation time under the action of the water, which would allow its use as slow release fertilizers. It should be emphasized that field trials would be important to prove their efficacy by conducting experiments involving one or more plant species, although this is not the objective of this study.



Aglomeração mineral, Adubos de liberação lenta, Calcário, Briquetagem, Mudas florestais, Mineral agglomeration, Slow release fertilizers, Limestone, Briquetting, Forest saplings


MARINHO, D. Y. Produção de adubos de liberação lenta utilizando a briquetagem de finos de calcário e melado de cana: estudos iniciais. 2019. 70 f. Dissertação (Mestrado em Engenharia de Produção) - Universidade Federal de Goiás, Catalão, 2019.