Type of Document Master's Thesis Author DiPaola, Louis George URN etd-07242012-040126 Title Surface application vs. incorporation of limestone for no-till alfalfa production Degree Master of Science Department Agronomy Advisory Committee
Advisor Name Title Wolf, Dale D. Committee Chair Alley, Mark M. Committee Member Parrish, David J. Committee Member Keywords
- Liming of soilsNo-till alfalfa (Medicago sativa L.
- 2. surface application after tillage and preparati
- and 3. surface ap- XÄI plication without tillage.
- and 5.00 tons per acre with each placement method.
- VA (37° 1l’N
- 80° 25’W and 1950 ft. elevation) on a Groseclos
- mesic Typic Hapludult) having a pH of 5.6 in the t
- VA (38° l3’N
- 70° 7’W and 515 ft. elevation) on a Davidson cl
- thennic Rhodic Paleudult) having a pH of 5.7 in th
- 1 to 2
- 2 to 3
- and 3 to 6 inches for surface
Date of Defense 1989-05-15 Availability restricted AbstractNo-till alfalfa (Medicago sativa L.) establishment is the only environmentally sound
procedure for alfalfa production on erodable land. Surface limestone application is the only reasonable
method of placement in no-til1 systems with pH below 6.5. The purpose of this research
was to evaluate surface limestone application vs. incorporation throughout the plow layer for alfalfa
production in acidic soils. In this study limestone placement included: 1. incorporation during
tillage operations, 2. surface application after tillage and preparation of seedbed, and 3. surface application without tillage. Limestone was applied at 0, 1.25, 2.50, and 5.00 tons per acre with each
placement method. Limestone treatments were imposed on 30 Sept. 1986 in Montgomery County,
VA (37° 1l’N, 80° 25’W and 1950 ft. elevation) on a Groseclose silt loam (clayey, mixed, mesic
Typic Hapludult) having a pH of 5.6 in the top 9 inches. Limestone treatments were imposed at
a second site on 25 Nov. 1986 in Orange County, VA (38° l3’N, 70° 7’W and 515 ft. elevation)
on a Davidson clay loam (clayey, oxidic, thermic Rhodic Paleudult) having a pH of 5.7 in the top
9 inches. 'Cimmeron’ alfalfa was planted using no-till procedures on 23 March 1987 in
Montgomery County and on 26 Aug. 1987 in Orange County. Soil samples were taken about 2
years after limestone application at depths of 0 to 1, 1 to 2, 2 to 3, and 3 to 6 inches for surface
applied treatments and 0 to 3, 3 to 6, and 6 to 9 inches for incorporated treatments. Soil samples
w0ere also taken at a depath of 18 to 24 inches whenre limestone was incorpdorated during tillage at
5 tons per acre. Four harvests were made in 1988. At both locations, limestone application
increased yields by 114 to 300% as compared with the check where no limestone was applied.
Yields from plots receiving surface limestone application were equal to plots with incorporation at
both locations. Tillage did not increase yields as compared with no tillage except in Orange County
on plots where no limestone was applied. Soil pH increased from 5.6 to 6.8 at the 1- to
2-inch depths and from 5.6 to 6.3 at the 2- to 3-inch depths where 5 tons per acre of limestone were surface
applied in Montgomery County. In Orange County, soil pH increased from 5.5 to 6.5 at the 1- to
2-inch depths and from 5.6 to 6.1 at the 2- to 3-inch depths where 5 tons per acre limestone were
surface applied. Above pH 5.5, Al saturation was below 2.7% in Montgomery County and 0.7%
in Orange County. Aluminum saturation averaged 9.0% and 4.6% where pH was between 5.0 and
5.5 in Montgomery and Orange Counties, respectively. At both locations, in the 18- to 24-inch
depths a pH of 4.8 was not influenced by limestone incorporated at 5 tons per acre. Aluminum
saturation at 18- to 24-inch depths was 51% and 62% in Montgomery and Orange Counties, respectively.
These data indicate that surface applied limestone can produce first year alfalfa yields
similar to yields obtained with incorporated limestone.
Filename Size Approximate Download Time (Hours:Minutes:Seconds)
28.8 Modem 56K Modem ISDN (64 Kb) ISDN (128 Kb) Higher-speed Access LD5655.V855_1989.D562.pdf 3.27 Mb 00:15:09 00:07:47 00:06:49 00:03:24 00:00:17next to an author's name indicates that all files or directories associated with their ETD are accessible from the Virginia Tech campus network only.
If you have questions or technical problems, please Contact DLA.