33
3
2.5 T SP ---- .***
Cu 1.5 7* 5.,..**** ** -.
2.5
*TSP
p(V~ ......... ._ ---_'--.-FI
1.5 ..**
PCW ---F-P..
0.5 *
0.8 1 1.2 1.4 1.6 1.8 2 2.2
ENVIRONMENTAL INDEX, El WL SF SF PF SF PF2 PF
LAND CLASSES Figure 8. Cowpea response (MG/HA) of four treatments to environment,
Manaus, Brazil 1990 (Singh)