Which of the following is a strategy to reduce greenhouse gas emissions in agriculture?

Optimizing fertilizer management is a key strategy to reduce greenhouse gas emissions in agriculture because it addresses the efficient use and application of fertilizers, particularly nitrogen-based fertilizers which are known to contribute to greenhouse gas emissions when applied excessively. When fertilizer is properly managed, it ensures that plants receive the nutrients they need without excessive runoff or volatilization, thus reducing the release of nitrous oxide, a potent greenhouse gas.

This strategy involves practices such as soil testing to determine the specific nutrient needs of crops, applying fertilizers at the right time and in the right amounts, and choosing appropriate types and methods of application. By improving fertilizer efficiency, farmers can enhance crop yield while simultaneously minimizing the environmental impact, leading to lower overall greenhouse gas emissions compared to practices that involve excessive fertilizer usage.

In contrast, replacing all livestock with crops may not be feasible or sustainable, as livestock can contribute to nutrient cycling and organic matter in soils. Using more chemical pesticides does not directly relate to greenhouse gas emissions and could potentially have negative environmental effects. Increasing monocropping practices may lead to soil degradation and increased pest issues, ultimately impacting sustainability and emissions in a negative manner.