Knowra Tilth Tilth Tilth is the physical condition of soil, especially its suitability for plant growth and cultivation. It reflects soil structure, moisture, aeration, and resistance to erosion or compaction.
Soil structure : The arrangement of soil particles and aggregates, which determines pore spaces and many physical properties. Aggregate arrangement shapes tilth by controlling pore space, drainage, and resistance to compaction.
Soil compaction : The compression of soil that reduces pore space and increases its bulk density. Compaction commonly degrades tilth by restricting root growth, air exchange, and water infiltration.
Seedbed : The prepared soil layer in which seeds are sown and begin to germinate. A fine, firm but not compacted seedbed is a practical expression of suitable tilth.
Soil erosion : The removal of soil by water, wind, or other forces. Weak aggregates and bare, crusted surfaces can make soil with poor tilth more vulnerable to erosion.
Soil aggregate : A cluster of sand, silt, clay, and organic matter held together by physical and chemical forces. Stable aggregates give soil a crumbly structure associated with good tilth.
Soil crust : A dense surface layer formed when soil aggregates break down and particles seal the ground. Crusting is a surface-specific loss of tilth that can impede seedling emergence and infiltration.
No-till farming : A crop-production system that seeds into untilled soil while leaving most crop residue on the surface. It protects aggregates and soil cover rather than relying on repeated loosening to create tilth.
Water infiltration : The entry of water from the ground surface into soil. Poor structure can slow infiltration, increasing runoff and leaving less water available within the root zone.
Soil porosity : The proportion of soil volume occupied by pores that hold air or water. Pore size and continuity govern the aeration and water movement that tilth depends on.
Soil bioturbation : The mixing and restructuring of soil by organisms and their activities. Burrowing animals and other organisms create channels and aggregates that can improve soil tilth.
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