Barriers to environmental management in clusters of small businesses in Brazil and Japan: from a lack of knowledge to a decline in traditional knowledge

Fundação de Amparo à Pesquisa do Estado de São Paulo (FAPESP)

Barriers to Latin American and Caribbean exports in the US market, 1998-1999

Includes bibliography

Optimal moment to change pressure regulator and sprayer kit on center pivot irrigation machines: a theoretical proposal

A theoretical model was developed in order to determine the optimal moment for substituting the sprayer and pressure regulator kit on a center pivot irrigation machine. The model is based on the hypothesis that pressure regulator and sprayer deterioration decrease irrigation uniformity. To compensate the deficit that happens at under irrigated areas, an increase on irrigation depth is required. The model considers: additional water consumption and energy costs, maintenance and labor costs, as well as yield losses associated with under or over irrigated areas. The sum of all these components is compared to buying and installing a new spray kit cost, allowing the farmer to decide the best moment to renovate the sprayer and pressure regulator kits on a center pivot irrigation machine based on economic criteria.

Optimal moment to change pressure regulator and sprayer kit on center pivot irrigation machines: application to a study case

A theoretical model developed by the authors for determining the optimal moment to substitute sprayer and pressure regulator kit on a center pivot irrigating potatoes and beans has been applied. The methodology compares the sum of the costs due to additional consumption of water and energy, maintenance and labor, as well as yield losses associated to areas with deficit or over irrigation to the costs due to buy and install a new sprinkling set on the pivot. The results showed that for a reduction of 3.07% of the Hermann and Hein’s Uniformity Coefficient (UCh), the substitution of the sprinkling module on the pivot is justified when potatoes and beans are cultivated.

The Mexican road to change

Discurso pronunciado por el Secretario de Programación y Presupuesto de México el día 10 de mayo.

Barriers to Latin American and Caribbean exports in the US market, 2000-2001

Includes bibliography

US barriers to Latin American and Caribbean exports 1994

Includes bibliography

US barriers to Latin American and Caribbean exports 1995

Includes bibliography

US barriers to Latin American and Caribbean exports 1996

Includes bibliography

US barriers to Latin American and Caribbean exports 1997

Includes bibliography

Barreras que imponen los Estados Unidos a las exportaciones procedentes de América Latina y el Caribe 1992 = US barriers to Latin American and Caribbean exports 1992

Incluye Bibliografía

Barreras que imponen los Estados Unidos a las exportaciones procedentes de América Latina y el Caribe 1994 = US barriers to Latin American and Caribbean exports 1994

Incluye Bibliografía

Principal barriers to the adoption of ICTs in agriculture and in rural areas

Includes bibliography

Strategies to overcome barriers to the implementation of the Barbados Programme of Action and the Mauritius Strategy in the Caribbean

Includes bibliography.