| Material Information
||Effect of lime levels on the establishment, growth and elemental recovery by Pangola digitgrass /
||Research report ;
||2, 1 p. : ill. ; 28 cm.
||Dantzman, Charles L., 1917-
Agricultural Research Center, Ona
||Agricultural Research Center,
Agricultural Research Center
||Place of Publication:
||Liming of soils -- Florida ( lcsh )
Pangolagrass -- Field experiments -- Florida ( lcsh )
||government publication (state, provincial, terriorial, dependent) ( marcgt )
non-fiction ( marcgt )
||Statement of Responsibility:
| Record Information
||University of Florida
||University of Florida
||All rights reserved by the source institution and holding location.
||oclc - 85852127
Agricultural Research Center *
f Research Report 75-7 JL 1 0 7 Ma 1975
.'Effect of Lime Levels on th Etablishment, Growth, and
Elemental Recovery b 1ioa- r dss.
C. L. Dantzman-
Virgin flatwoods soils are normally very acid and usually low in fertility.
Lime can raise the pH, provide calcium (Ca) and magnesium (Mg) and as a result
provide a better environment for the roots 6f pasture grasses. This report
covers three years of continuing study to determine the level of lime needed
to produce Pangola digitgrass on acid flatwoods soils.
The trial was established in July of 1970 and extended through 1974 at
'the Ona Agricultural Research Center (ARC). Lime was surface applied to
replicated plots at rates of 0, 1, 2, 3, and 4 ton per acre. One-half of the
Slime of each treatment was applied as dolomite and one-half as a high calcic
lime equivalent (applied as hydrated lime). Following application the lime was
rototilled into the surface six inches of the soil. The area was then planted
with Pangola. Initial applications of fertilizer included 100 pounds of
nitrogen (N), 50 pounds of P,05 and 50 pounds of KO0 per acre. The grass was
harvested to a 3.5 inch stubBle. The plots were fertilized following each
harvest with 50 pounds per acre of N using ammonium nitrate, 25 pounds per
acre rate of P205 using single superphosphate and 25 pounds per acre rate
of K20 using muriate of potash. Micronutrients were supplied with 20 pounds
per acre of FTE 503 initially and subsequently each year. / Eleven harvests
were made overthe period.of time included in this report. Harvest dates
extended from February through October. Plant materials were weighed, ground,
digested and analyzed for Ca and Mg.
Soil samples were taken before lime application and each subsequent spring.
Soil extracts (IN ammonium acetate at pH 4.8) were analyzed for Ca, Mg, K, P
and pH by the University of Florida Soil Testing Laboratory.
Results and Discussion
The July 1970 soil samples were fairly consistent and were not significant-
ly different. The 1971 samples were taken nine months after the lime
treatments were applied and show significant increases in both CaO (128 to 205%)
and MgO (115 to 148%) over the control (no lime treatment). The 1972 soil
CaO values also increased over the control of 647 Ibs/A CaO to 1151 for the
1 ton/A lime rate and to 1341 lbs/A for the 4 tons per acre rate (increases
from 78 to 107%) over the control. MgO followed a pattern similar to that
I/ Assistant Soils Chemist, Agricultural Research Center, Ona.
2/ FTE 503 contains 18% Fe, 7% Zn, 7.5% Mn, 3% Cu, 3% B, and 0.2% Mo.
The soil pH of the native Immokalee fine sandy soil ranged from 4.5 to
4.7 in the pretrial condition (1970). Nine months after lime treatments
were applied (1971), the pH value was 4.8 for the 1 ton lime rate and 5.4
for the 3 ton rate. The pH values for 1972 were quite similar to 1971.
During this time the soil of the control treatment (no lime) became slightly
more acid, testing pH 4.3.
The total yield of Pangola in tons/A of oven-dry forage is given in
Figure 1. Since the Pangola was established in mid July of 1970, there was
only one harvest for that year. Lime applied at any level (1 to 4 tons/acre)
produced significantly greater pangolagrass yields than the no lime treatment.
There were no significant yield responses as the lime rate was increased
above one ton/A.
The percent of Ca in the oven-dry forage for the eleven harvests were
0.222%, 0.273%, 0.3217, 0.334% and 0.343% Ca for the 0, 1, 2, 3, and 4 ton
lime rates,i respectively. Magnesium percentages for the same treatments were
0.173%, 0.207%, 0.242%, 0.242%, and 0.238% Mg. The levels of Ca and Mg in
the tissue were quite consistent with the rates of lime applied.
.A trial was conducted to test five levels of lime: 0, 1, 2, 3, and 4
ton/A rates on the growth of Pangola digitgrass, on the recovery of Ca and
Mg in the forage, and on soil test. Eleven harvests were made over a period
of three years. Results indicate that soil CaO increased 171 and 504 lbs/A
over the control for the 1 ton/A rate for the first and second years res-
pectively after lime applications.
Soils treated with 3 ton/A of lime increased 608 and 862 lbs/A CaO
over control values of 610 and 647 Ibs/A for 1971 and 1972 respectively.
Magnesium followed a similar pattern. Total oven dry yields for harvests
taken during 1971 showed no significant increases in yield for the lime
treated plots over that for the control. However total yields taken for
1972 were significantly greater for all treatments receiving lime (1 to
4 ton/A than those for the control (no lime treatment). Average percent
Ca in the plant tissue increased as the lime treatments increased, varying
from 0.222% Ca for the control treatment to 0.343% for the 4 ton/A rate of
lime. Plant tissue Mg followed a similar trend and ranged from 0.173% Mg
for the control (no lime) to 0.238% for the 4 ton/A rate.
Yield data suggest that one ton of lime per acre should be applied
to flatwoods soils in native condition being planted to Pangola digit-
grass. It also suggests that the pasture be relimed with dolomite (high
calcic lime if soil tests indicate that magnesium levels are adequate) at
one ton per acre not later than the fifth year after establishment.
Pangola digitgrass yield response to levels of lime for
1970-1972 on Immokalee fine sand.
Lime Levels Ton/Acre
:Points on graph indicated by "b" are significantly greater than the
point indicated by "a".
- -6- 1 t