Group Title: TropSoils field research brief ; 5
Title: Response of corn and soil base levels to K applied at three lime rates in Sitiung 1
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Full Citation
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Permanent Link: http://ufdc.ufl.edu/UF00080583/00001
 Material Information
Title: Response of corn and soil base levels to K applied at three lime rates in Sitiung 1
Series Title: TropSoils field research brief ; 5
Physical Description: 4 leaves : ill. ; 28 cm.
Language: English
Creator: Gill, Dan.
Kamprath, Gene.
Soil Management Collaborative Research Support Program.
Publisher: Soil Management Collaborative Research Support Program, North Carolina State University,
Publication Date: 1985
 Subjects
Subject: Soil amendments -- Indonesia.
Liming of soils -- Indonesia.
Soil management -- Indonesia.
Corn -- Yields -- Indonesia.
Spatial Coverage: Indonesia. -- Sumatra
 Notes
General Note: Caption title.
General Note: "March, 1985."
General Note: At head of title: TropSoils-Indonesia.
 Record Information
Bibliographic ID: UF00080583
Volume ID: VID00001
Source Institution: University of Florida
Rights Management: All rights reserved by the source institution and holding location.
Resource Identifier: oclc - 156912174

Full Text





TROPSOILS INDONESIA
Field Research Brief # 5
March, 1985


Pr R S L ,L
PUSL TTAN
\N ST SU MERA,
)~~~~- CC-CI-C- 1


TITLE: Response of Corn and Soil Base Levels to K Applied
at Three Lime Rates in Sitiung 1

Experiment #: 1102

Researchers: Dan Gill and Gene Kamprath


Objecti ves:


1. To examine the effects of rates of K applied at 3
Al saturation levels on corn yield, on Ca, Mg and
K uptake, and on exchangeable cation levels in
the soil.
2. To study how rates of K applied at 3 Al
saturation levels affect K retention and leaching


into the profile of a typic dystropept.

Soil: Typic dystropept cleared about 7 years ago, farmed
briefly, probably without fertilizers, and abandoned.
FCC Cak.

Experimental design: Split plot with 4 replications, subplots of
4.5 x 7 m. Main plots 3 lime levels:
0.375, 1.5 and 5 t lime/ha. Subplots K
levels: 0, 20, 40, 80, 120, and 240 kg/ha.


Crop History:


Cargill C-1 hybrid planted 23 Oct. 1984 at 25x75
cm spacing. Base fertilization (kg/ha) 300
urea, 750 TSP, 150 kieserite and 10 each of Mn,
Cu and Zn sulfate. Harvested on 2 and 4 Feb.
1985 (102 and 104 days).


Results: Applications of lime and K both gave significant grain
and stover yield responses (Tables 1 and 2), but this was not
unexpected, since the soil originally was 75 80% Al saturated
and averaged 0.10 meq K/100 cc. Yields were better than expected
however, since several problems were encountered during the
growing season. Chlorotic plants were observed scattered
throughout the experiment during vegetative growth with symptoms
being slightly worse on the higher K plots. This was tentatively
identified as Mg deficiency. Several droughts were experienced;
the longest, almost 2 weeks long, ended during tasseling. Higher
lime applications were quite effective in relieving drought
stress symptoms. Corn ear worms (Heliothus) were discovered at
silking but caused only minor yield losses.
Figure 1 shows the response of grain yield to K applied at 3
lime levels. Substantial increases (up to about 80 kg K/ha)
were observed at both the high and low lime levels, while the
moderate lime level (1.5 t/ha) had only an insignificant yield
increase. Variability in soil test levels of Al and K within the
experimental area may partially explain this lack of response;
however, soil samples have yet to be analyzed due to a lack of
instrumentation available locally. Response of the corn stover














(Figure 2) was more consistent, with increases being observed at
all three lime levels up to above 80 kg K/ha. Lodging w:as
significantly decreased by K application (Table 2).



Table 1. Grain and stover yield of corn at 3 lime levels.


Lime Rate
(t/ha)

-. 375
1.5
5. 0


Yield (t/ha)
Grain Stover


3. 06
3.8 O
4. 44


3.7
5. C)
5.0
6. 0


Table- 2.


Grain and
rotes.


stover yield and lodging of corn at


Potassium rate
(ko/ha)


20
40
80
120
240


Grai n

3.05
3.66
3.71
3.94
4.17
4.07


Yield (t/ha)
Stover

3.4
4.1
4.3
5.6
5.7
6.1


Lodging
(# plants/plot)

4.8
2.3
1. 0
I'. 3
0.3

0.4


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