<P> Among some of these problems is the depletion of underground aquifers through overdrafting . Soil can be over-irrigated because of poor distribution uniformity or management wastes water, chemicals, and may lead to water pollution . Over-irrigation can cause deep drainage from rising water tables that can lead to problems of irrigation salinity requiring watertable control by some form of subsurface land drainage . However, if the soil is under irrigated, it gives poor soil salinity control which leads to increased soil salinity with consequent buildup of toxic salts on soil surface in areas with high evaporation . This requires either leaching to remove these salts and a method of drainage to carry the salts away . Irrigation with saline or high - sodium water may damage soil structure owing to the formation of alkaline soil . </P> <P> Synthetic pesticides such as' Malathion',' Rogor',' Kelthane' and' confidor' are the most widespread method of controlling pests in agriculture . Pesticides can leach through the soil and enter the groundwater, as well as linger in food products and result in death in humans . Pesticides can also kill non-target plants, birds, fish and other wildlife . A wide range of agricultural chemicals are used and some become pollutants through use, misuse, or ignorance . Pollutants from agriculture have a huge effect on water quality . Agricultural nonpoint source (NPS) solution impacts lakes, rivers, wetlands, estuaries, and groundwater . Agricultural NPS can be caused by poorly managed animal feeding operations, overgrazing, plowing, fertilizer, and improper, excessive, or badly timed use of Pesticides . Pollutants from farming include sediments, nutrients, pathogens, pesticides, metals, and salts . </P> <P> Listed below are additional and specific problems that may arise with the release of pollutants from agriculture . </P> <Ul> <Li> Pesticide drift <Ul> <Li> soil contamination </Li> <Li> air pollution spray drift </Li> </Ul> </Li> <Li> Pesticides, especially those based on organochloride </Li> <Li> Pesticide residue in foods </Li> <Li> Pesticide toxicity to bees <Ul> <Li> List of crop plants pollinated by bees </Li> <Li> Pollination management </Li> </Ul> </Li> <Li> Bioremediation </Li> </Ul>

Discuss two ways in which agriculture contribute to environmental degradation