Which of the following is not a consequence of poor nutrient management?

Increased crop yields are typically associated with effective nutrient management, rather than poor practices. When nutrients are managed properly, crops receive the necessary elements for growth, leading to optimal yields. Conversely, poor nutrient management often leads to nutrient deficiencies or imbalances, which can adversely affect crop productivity.

The other options represent direct consequences of inadequate nutrient management. Nutrient pollution of water sources occurs when excess nutrients, particularly nitrogen and phosphorus, from fertilizers leach into waterways, leading to issues like algal blooms. Soil erosion can be exacerbated by poor nutrient management practices that fail to sustain soil health, resulting in the loss of topsoil and essential nutrients. Finally, decreased environmental quality relates to the broader impacts of poor nutrient practices, which can harm ecosystems and lead to reduced soil and water health. Thus, the answer highlighting increased crop yields aligns with the understanding that effective nutrient management is essential for achieving high agricultural productivity.