Important linkages between farm management variables, soil loss, crop yields, and incentives to practice soil conservation have often been omitted from previous empirical studies, due to regional data limitations and incomplete knowledge of soil loss/crop yiled relationships. An optimal control model is developed with explicit attention to interactions between management choices, soil loss, and long-term farmland productivity.

This paper uses multiple regression analysis to examine the effects of energy resource development on sale prices of agricultural land in western North Dakota. The findings suggest that energy resources development has exerted only modest upward pressure on agricultural land values in the northern Great Plains. The land market in this region remains dominated by active farmers who are purchasing farmland as a long-term investment, and energy development has not had a major impact on the structure of that market.

Nigeria has a land area of 925,768 km2 or approximately 92,4 million ha., which places her as the 14th largest country in Africa. With a population estimated at 80 million, every inhabitant theoretically has only 1.15 ha of land available for meeting basic economic, industrial and social needs. Lying between latitudes 4°N and 12°N, on the west coast of Africa and with 680 km of coastline, land is not homogenous and is therefore not fully accessible ant! utilizable for any or all of these basic needs.

Policy issues surrounding Federal programs for land retirement as a means of curtailing soil erosion are discussed in this paper. The analysis is structured around productivity differentials observed for New York cropland rated as highly erosive, moderately erosive, or nonerosive.