1. Environmental effects of agriculture 10. Engineering and Environmental Geology

2. The agriculture id the oldest activity in the history of mankind. It meant the beginning of the transforlation the original, natural environment. During the last centuries agriculture went through a very rapid, intensive change. As the result of the development of implements and technologies people managed to enlarge the cultivated areas. The gradual formation of monocultural farming induced irreversibile changes regarding the quality of the soil and the ground water.

3. 1. Environmental effects of modern agriculture 1) Conventional agriculture. Reduction and, especially, elimination of agrochemical require major changes in management to assure adequate plant nutrients and to control crop pests. Processes of conventional agriculture (KERÉNYI 2003)

4. 2) Modern agriculture. The specialization of production units has led to the image that agriculture is a modern miracle of food production. Processes of modern agriculture (KERÉNYI 2003)

5. Organic fertilizer Syntetic fertilizer (www.balkonkertesz.hu)

6. 2. Effects of agriculture to soil (groundwater) Water erosionWind erosion 1.Surface erosion 2.Rill erosion 3.Stream channel erosion 2.1. Soil degradation Rill erosion (www.enfo.agt.bme.hu)Traces of wind erosion (www.enfo.agt.bme.hu)

7. 2. Secondary salinization Secondary salinization at the Great Hungarian Plate (forrás: www.szikesviz.hu)

8. 3. Effects of agriculture to the ecosystem of soil 1. Land transformation and degradation Szántással javított talajszerkezet (www.static.fotoalbum.hu)

9. 2. Eutrophication Eutrophization of a dead channel of the Danube (www.rdhsz.hu)

10. 3. Irrigation Motorized irrigation (www.idokep.hu)

11. 4. Pesticides Pesticides are organic and inorganic chemicals originally invented and first used effectively to better the human environment by controlling undesirable life forms such as bacteria, pests, and foraging insects. Their effectiveness, however, has caused considerable pollution. 5. Herbicides and insecticides Herbicides are used to kill weeds, especially on pavements and railways. They are similar to auxins and most are biodegrale by soil bacteria.

12. 6. Monocultures Monocultural agriculture (www.think.transindex.ro)Crop rotation (www.petrs.network.hu)

13. Thank you for your attention!