Final answer:
The ideal soil type for farming that contains a mix of silty, sandy, and clay soils, along with organic humus, is known as loam. It is conducive to agriculture due to its balance of nutrients, structure, and moisture retention.
Step-by-step explanation:
The ideal soil type described as containing a balance of silty, sandy, and clay soils, plus organic humus material, is known as loam. Loam is renowned for its good structure, aeration, drainage, and nutrient-holding capacity, making it highly suitable for agriculture. The presence of humus further enhances the soil by providing plants with essential water and minerals. Given that mollisols are also excellent agricultural soils typically found in grasslands with moderate temperatures and rainfall, both loam and mollisols are representative of good, fertile soils for farming practices.