انطلاق   المعرض السعودي الزراعي ٣٧   الذي يقدم الجديد في مجال الزراعة بمشاركة ممثلين من ٣٥ دولة  
Identify the main topic of the news article and categorize it as either spiritual, human-rights-press-freedom, business-and-economy, sports, science-and-technology, education, environment, health, art-and-entertainment, or politics. Return only the label without any explanation, justification or additional text.