Avaliação emergética de gergelim irrigado com água residuária em ambiente semi-árido.

Abstract

The environmental and social crisis arising out of the organizational model socio-economic model that exploits the natural resources taken as infinite for the production of goods and services and sweeping nature with pollution conceived the notion of sustainability, which proposes a more harmonious with the environment. This study builds on this pillar and aims at implementing the emergy methodology in an agricultural system experimental production of sesame irrigated with treated wastewater. The sesame is a seed oil has a high nutritional value that is consumed for millennia and has great economic applicability in Northeastern Brazil. The use of treated wastewater provides numerous benefits to crop, because, besides being rich in essential nutrients for the plant (it was shown that irrigated with wastewater showed better results in relation to water supply) may be a solution to water scarcity, since agriculture is an activity that consumes water. The emergy evaluation, purposed by Odum (1971) considers all inputs and outputs of the system as energy flows in a diagram drawn and calculate emergy indices where examination plan efforts to improve the system consistent with environmental sustainability. The emergy indices found are the following: PISTON RINGS: 430000; Renewability: 49; income. Emergetic: 1.86; Emergy Investment: 10.0; emergetic exchange: 6.01. The emergy of natural resources and a total of 8999 sej nonrenewable, 1169 sej, the materials used in the experiment a total of 1023 sej, while that of services is 9129 sej. The total resources emerged from the economy is 1015 sej. The total emergy output (products) obtained was 2355 sej.