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Abstract
The amelioration of acid unproductive soils with various amendments may improve soil properties and increase crop yield. In this paper, the influence of several soil amendments (refuse sugar beet lime, calcium hydroxide, and municipal sewage sludge) on wheat yield and gross margin were studied in a three‐year (1995, 1996, 1997) field experiment, conducted in western Thessaly (Elassona area), central Greece. In order to evaluate soil amelioration from an economic point of view we estimated the profit that derives from soil amelioration for each year separately as well as for the whole period of the experiment. The results showed that sugar beet lime and sewage sludge at the rate 15 ton ha−1 are preferable from an economic point of view compared to calcium hydroxide. This fact is supportive of all the efforts made to diffuse the use of quality by‐products for soil amelioration.