Tilth in soil science refers to which aspect of soil?

• A. The nutrient content of soil.
• B. The desirable physical condition of soil for easy cultivation, root growth, and drainage.
• C. The soil's pH level.
• D. The soil's microbial activity.

Answer: (B)

Tilth describes the soil’s physical condition that makes it workable and favorable for plant growth. When tilth is good, the soil is loose and crumbly, with a stable aggregate structure that allows easy tillage, good drainage, and enough air for roots and microbes. Roots can penetrate easily, water moves through without puddling, and seedlings emerge more reliably. This is different from nutrient content (what minerals are available), pH (acidity or alkalinity that affects nutrient availability), or microbial activity (the biological processes happening in the soil). Tilth can be improved by adding organic matter, reducing compaction, and managing moisture so the soil stays crumbly and well aerated.