This document discusses major agricultural crops around the world and the conditions needed for their growth. It outlines that rice is the staple crop in tropical and sub-tropical regions, requiring high heat, humidity and rainfall to thrive in alluvial clay soils. Wheat does best in loamy, well-drained soil and needs moderate rainfall and temperatures during growth and sunny conditions for harvest. Millets and coarse grains grow in fertile, sandy soils and require low rainfall and moderate heat. The largest producers of these crops include China, India, USA, and others.