29:44

Lecture 22: Silicate Clays (Contd.)

30:16

Lecture 01: Basic Overview of Soil

27:33

Lecture 23: Sources of Charges in Soil

29:53

Lecture 28: Soil Acidity

31:40

Lecture 35: Fertilizers

27:50

Lecture 06: Soil Taxonomy and Classification

27:08

Lecture 50: Remote Sensing in Soil Survey

27:55

Lecture 02: Weathering and Soil Formation