Custos e rentabilidade do milho em função do manejo do solo e da adubação nitrogenada

Agronomic practices that help farmers to raise yield and reduce costs must be studied to ensure agricultural sustainability. Thus, the objective of this study was to analyze economically the effect of soil management and nitrogen fertilization in maize crops. Treatments consisted of a combination of 3 soil management techniques (plow harrows + floating harrows, chisel + floating harrows, and no-tillage), 5 periods of nitrogen fertilization (control - 0 kg ha -1 N; 120 kg ha -1 after sowing (S); 120 kg ha -1 in the V 6 stage; 30 kg ha -1 (S) + 90 kg ha -1 in V 6; 30 kg ha -1 (S) + 45 kg ha -1 in V 4 + 45 kg ha -1 in V 8 The total operating cost (TOC), gross revenue (GR), operating profit (OP), profitability index (PI), break-even yield, and break-even price were estimated. It was concluded that the no-tillage system, after 11 years of management, associated with nitrogen fertilization promotes positive PI and OP, being useful to farmers.

Fiscal Panorama of Latin America and the Caribbean 2013: tax reform and renewal of the fiscal covenant

Includes bibliography

Natural resources within the Union of South American Nations: status and trends for a regional development agenda

Includes bibliography

Distributive impact of public policy

Includes bibliography

Tax performance and reform in the Organization of Eastern Caribbean States (OECS)

Includes bibliography

Economic profiles of Caribbean countries

Includes bibliography

Macroeconomic policies in times of crisis: options and perspectives

Includes bibliography

The relationship between fiscal and current account balances in the Caribbean

Includes bibliography

E-commerce environment and trade promotion for Latin America: policy implications from East Asian and advanced economies' experiences

Includes bibliography

Retos de la política fiscal en Centroamérica

Incluye Bibliografía

La sostenibilidad de la deuda pública y la postura fiscal en el ciclo económico: el Istmo Centroamericano

Incluye Bibliografía

Generating inclusive and sustainable growth: the role of policy and multilevel fiscal institutions

Incluye bibliografía

Expenditures, investment and financing for sustainable development in Trinidad and Tobago

Includes bibliography

Tax reforms and fiscal stabilization in Latin American countries

Includes bibliography

Índice de seleção bioeconômico para fêmeas de corte da raça nelore

The reproductive efficiency of Nellore females was described on the basis of sexual precocity, staying productive in the herd (NP), maternal productivity (PM) and estimated cost for maintenance (CM). The combination of these traits resulted in the bioeconomic maternal revenue index (RMat) ensures reproductive efficiency. The index estimates the return in kilograms of live weight produced per cow per year. In addition, the composition of calf weight produced was considered, adding to the PM the information on the scores of conformation, muscling and early finishing at weaning, in order to input the calf biotype. The females considered precocious had their age at first calving before 30 months. The NP was expressed by the number of calving till 53 months of age. The CM was calculated according to the estimated feed intake of dry matter. The estimated average RMat was 62.02±24.12 kg/ cow/year. Estimates of additive genetic and residual variances for RMat, using restricted maximum likelihood under a single trait animal model was equal to 195.35 and 242.96, respectively. The heritability estimated was 0.45±0.02, indicating that RMat is inheritable and can be applied in the breeding program to improve reproductive efficiency. The NP was the main component of variation for RMat. Sires selected based on RMat tended to have more efficient daughters.