Table 2. Corn ear leaf area affected by clover-tillage management
and N fertilizer. (Average of five ear leaves)
 Nitrogen level (kg/ha)
Management 0 67 134 201 268 Average
 ----- Square centimeter/5 leaves ------
CT-forage 2838 3258 3293 3333 3383 3221 v

CT-Green manure 2834 3043 3136 3236 3395 3129 v

NT-Mulch 2488 3214 3162 3405 3574 3169 v

NT-Forage 2274 2724 3158 3386 3286 2961 v

Fallow 2160 3044 3212 3521 3495 3086 v

LSD=169
Average 2519 c 3057 b 3192 b 3376 a 3422 a
CV=7.96%
CT-forage = Clover harvested for forage followed by conventional
tillage soil preparation. CT-Green manure = Clover turned under
with conventional tillage. NT-Forage = Clover harvested for forage
followed by direct seeding with in-row subsoil no-tillage planter.
NT-Mulch = Direct seeding in clover with in-row subsoil no-tillage
planter. Fallow = No winter cover crop, area kept clean tilled as
a control treatment. Values in rows within each management
treatment not followed by the same letter (a,b,c,d,e) are
significantly different at the 0.05 level of probability according
to LSD. Values in columns not followed by the same letter
(v,w,x,y,z) are significantly different according to Duncan's
multiple range test.


Corn ear leaf area affected by tillage-
 clover management and N fertilizer


0 60 100 160 200 250 300
 Kg/ha Nitrogen
- CT Forage CT Green Manure NT Muloh
-- NT Forage F- Fallow


Figure 1