Tilth:
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It is the physical condition of soil obtained out by tillage (or) it is the resultant effect of tillage in which soil air, soil water and soil aggregates are in perfect harmony or in balance condition.

OR

It is physical condition of soil as related to its easy to tillage, fitness as seedbed, easy root penetration and better plant growth.

1 Tilth indicates following two properties

1. Size distribution of aggregates

The relative proportion of different sized soil aggregates is known as size distribution of soil aggregates. For irrigated agriculture higher amount of larger aggregates (> 5mm in diameter) are necessary, while under dry land agriculture higher amount of smaller aggregates (1 to 2 mm in diameter) are necessary.

2. Mellowness or Friability

It is that property of soil by which the clods when dry become more crumbly. A soil with good tilth is quite porous and has free drainage up to water table. The capillary and non- capillary pores should be in equal proportion, so that sufficient amount of water (moisture) and air is maintained.