Consider the following statements regarding the relationship between soil organic carbon, nutrient management, and water quality in the context of sustainable agriculture:

Statements

1. Declining soil organic carbon is associated with greater micronutrient deficiency in soils, thereby affecting both crop yield and the nutritional quality of produce.
2. Eutrophication of water bodies such as village ponds and reservoirs is primarily caused by the depletion of dissolved oxygen from industrial effluents, and is unrelated to agricultural nutrient runoff.
3. Treated wastewater used for irrigation can serve as a resource that eases pressure on groundwater, provided it is managed to prevent the re-introduction of salts, nutrients and contaminants into the soil.