In order to help Hakeem find relevant sources for his research on farmers' use of DOT and its effect on the bird population, the best phrase for him to use when searching would be "DOT bird population." This phrase includes both key elements of his research topic, which are the use of DOT and its impact on the bird population. By combining these two aspects in his search phrase, Hakeem is more likely to find sources that specifically address the relationship between DOT (presumably a farming technology or practice) and the bird population.
Alternatively, Hakeem could also consider using the phrase "farmers bird population" in his search query. This phrase focuses on the connection between farmers and the bird population, which may lead to sources discussing how farmers' practices or activities, including the use of DOT, influence the bird population in agricultural settings.
Both of these search phrases target the core components of Hakeem's research interest and are likely to yield relevant sources that can provide him with valuable information for his study. By being specific in his search terms and including key keywords related to his topic, Hakeem can enhance the quality and relevance of the sources he finds.
