Which of the following is NOT a factor influenced by agronomic practices?

Weather forecasting accuracy is an aspect that is largely determined by meteorological science and technology rather than agronomic practices. Agronomic practices focus on the interaction between crops, soil, and nutrients, as well as the management of farming techniques. While these practices can influence factors such as soil nutrient retention, water quality improvement, and soil erosion control, they do not affect the ability to predict weather patterns or the accuracy of forecasting techniques.

In contrast, soil nutrient retention is influenced by practices like crop rotation, cover cropping, and the type of fertilizers used, which improve the soil's ability to hold nutrients. Water quality improvement can result from responsible nutrient management, which minimizes runoff and leaching. Soil erosion control is also closely tied to agronomic practices such as conservation tillage and maintaining vegetation cover, which help protect the soil from being washed or blown away. Therefore, while several agronomic practices have significant environmental impacts, forecasting weather patterns is an independent scientific matter not influenced by these practices.