Encontro de Energia no Meio Rural

Abstract

CAMPOS, Alessandro Torres, ZONIN, Wilson J., SILVA, Nardel L. S. et al. Energy inputs and outputs in organic and conventional corn production systems. In Procedings of the 5th Encontro de Energia no Meio Rural, 2004, Campinas (SP) [online]. 2004 [cited 15 October 2024]. Available from: <http://www.proceedings.scielo.br/scielo.php?script=sci_arttext&pid=MSC0000000022004000100028&lng=en&nrm=iso> .

It was objectified in this research to esteem the energy inputs and outputs in organic and chemical corn production systems. The experimental delineating was in casual blocks with arrangement in subdivided parcels, with the production systems as main parcels and the cultivate crops as subparcels. The seeding was accomplished directly in oat and azevem straws. In the chemical system the vegetable covering was wiped with glyphosate (2 L/ha), while in the organic system it was used roll machinery to handle the straw. All the inputs, in products or operations form, and the outputs, in grain form, were transformed in energy to estimate the energy balance. The energy coefficients were obtained in research travails. The employed energy was divided in three categories, according to its origin, as biological, fossil and industrial. In the category of biological energy the items human work, seeds, biofertilizer and humus were inserted. The oil products and by-products, such as chemical fertilizer, agrotóxicos, diesel were grouped in fossil energy category. Energia industrial foi considerada que empregou na produção de maquinaria usada no processo produtivo que é incluído nesta categoria: trator e os utensílios. The energy consumption in the organic corn production system was of 2,047.42 MJ ha^-1 and the energy conversion was of 78,235.33 MJ ha^-1, and the biological energy was the energy form more consumed, 65,77% of total consumed, while in the conventional system the consumption was of 3,764.66 MJ ha^-1 and the energy conversion of 82,653.29 MJ ha^-1, and the fossil was energy form more consumed, representing 79.57% of the energy consumed in this production system. The organic production system presented an efficiency of 38.21 significantly larger than the chemical system with 21.95.

Keywords : Aproveitamento de resíduos; dejetos de bovinos; produção orgânica; energia; sustentabilidade de agroecossistemas; análise energética.