o) 35
S30
(0- Dung-0
--Dung-1
z / Dung-2
25 -Dung-3
25
20 ------------------------
20
1 2 3
Ring
Figure 4-7. Ring number X dung application frequency interaction (P = 0.019) for bahiagrass
herbage N harvested during 2006. The ring number effect was quadratic (P = 0.048)
for three applications and linear (P < 0.001) and quadratic (P = 0.007) for two dung
applications, but was not significant (P > 0.288) for one and no dung applications (P
> 0.167). Standard error of a treatment mean was 1.5 kg ha-1. Ring Numbers 1
through 3 refer to sampling areas 0 to 15, 15 to 30, and 30 to 45 cm from the center of
the dung application, respectively.
Herbage Phosphorus Harvested
For both dung- and urine-treated plots there was a ring number main effect (P < 0.003) on
herbage P harvested and an application frequency X ring number interaction (P = 0.0584 for
dung and P < 0.001 for urine; Tables A-2 and A-3).
The application X ring number interaction in urine-treated plots occurred because P
harvested decreased with increasing ring number for Application Frequencies 1 through 3, but
there was no effect of ring number for the zero application frequency (Fig. 4-8). This pattern of
response is nearly identical to DM harvested because there was no effect of ring number on