CROP ROTATION IN RELATION TO SOIL PRODUCTIVITY 
55 
5 ° 
<£ 
n 
• u a c 
- 
A >, _j O g § 
= i; — 
■a.2 
; ff^Z ~ ~. = 5T3 a = « JH 
Eg £ 
"5 3 
St«82S-S£? a, 
?5^2 
a> <n moo 
"ace 
- a c 
■o>ooa>ns>OHO« 
■ o — r^ — i r-' ri — ' eg >d — 
:cnr:i.-.L.':cL-xc; 
= ■= |-| = 3-g 3-g =~ ="E 5'= 
