Table 4. Corn ear leaf N affected by clover-tillage management
and N fertilizer. (Average of five ear leaves)
 Nitrogen level (kg/ha)
Management 0 67 134 201 268 Average
 -------------- Percent ---------------
CT-forage 1.86 2.53 2.62 2.95 3.10 2.61 w

CT-Green manure 2.53 2.62 2.77 2.99 3.23 2.83 v

NT-Mulch 1.87 2.82 2.74 2.91 2.99 2.67 vw

NT-Forage 1.64 2.52 2.53 2.73 3.22 2.53 w

Fallow 1.71 2.39 2.75 3.10 3.16 2.62 w

LSD=.20
Average 1.92 d 2.58 c 2.68 c 2.94 b 3.14 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 N affected by tillage
clover management and N fertilizer


0 50 100 160 200 250
 Kg/ha Nitrogen
- CT Forage -- CT Green Manure -- NT Muloh
- NT Forage -- Fllow


300


Figure 3