A. An area of soil from root surface to 5 cm
B. Root surface
C. Area within the roots
D. All of them
A. Pakistan
B. Canada
C. Alaska
D. Both b & c
A. Fundamentals of soil
B. Essenttials of soil sciences
C. The nature and properties of soil
D. The mechanics of soil
A. Meredith and Bridge (1972)
B. Richey (1914)
C. Jenkins (1935)
D. Hull (1950)
A. Nelson (1973)
B. Flor (1956)
C. Robinson (1971)
D. Vander plank (1963)
A. June 24, 1959
B. Jan 24, 1956
C. Jan 30, 1959
D. Jan 24, 1959
A. On surface
B. Below soil solum
C. At the level
D. On the mountain