Group Title: TropSoils field research brief ; 6
Title: Response of upland rice and soil base levels to applied K at three lime levels in Sitiung 2
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Permanent Link: http://ufdc.ufl.edu/UF00080584/00001
 Material Information
Title: Response of upland rice and soil base levels to applied K at three lime levels in Sitiung 2
Series Title: TropSoils field research brief ; 6
Physical Description: 3 leaves : ill. ; 28 cm.
Language: English
Creator: Gill, Dan
Kamprath, Gene
Wade, M. K. (Michael Karl)
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
Soils -- Potassium content -- Indonesia.
Liming of soils -- Indonesia.
Rice -- Yields -- Indonesia.
Spatial Coverage: Indonesia.
 Notes
General Note: Caption title.
General Note: "March, 1985."
General Note: At head of title: TropSoils-Indonesia.
 Record Information
Bibliographic ID: UF00080584
Volume ID: VID00001
Source Institution: University of Florida
Rights Management: All rights reserved by the source institution and holding location.
Resource Identifier: oclc - 156912256

Full Text







TROPSOILS INDONESIA
Field Research Brief # 6
larch, 1985

Title: Response of Upland Rice and Soil Base Levels to Applied K
at Three Lime Levels in Sitiung 2

Experiment #: 1204

Researchers: Dan Gill, Gene Kamprath and Mike Wade


Objectives:


1. To determine the effects of K rates at 3 levels of
base saturation on yield and uptake of K and other
basic cations by upland rice in Sitiung 2.
2. To determine the effects of different levels of
base saturation on retention and movement of K
applied at various rates to a haplorthox.


Soil: Typic haolorthox cleared about 7 years ago, crcoped for a
snort time and abandoned. FCC: Ceak.


Treatments:




Crop History:


Randomized complete block design with 3 clocks.
Treatment design was a complete factorial with 3
levels of lime 0.375, 1.5 and 5.0 t/ha and 6 K
rates 0, 20,40, 80, 120, and 240 kg K/ha.

The cultivar "Sentani" was planted 19 Oct. 1984 at
25 x 25 cm spacing. Base fertilization included
(kg/ha) 130 urea split applied, 500 TSP, 125
kieserite, 15 MnS04, and 10 of Cu and Zn sulfate.
Diazinon and sevin were applied several times each
to control insect pests. Most plots were
harvested on-19 Feb. (123 days), while several did
not. mature as soon and were harvested on 25 Feb.
(129 days).


Results: Aluminum saturation of the original soil averaged 75+%,
while exchangeable K levels were about 0.05 meq/100 cc. Thus a
vield response to both lime and K was expected. However, yields
were not significantly affected by lime (Table 1), but they were
highly affected by applied-K (Table 2). Since there was no
significant lime by K interaction for grain yield, the response
curves for the three lime levels were pooled into one (Figure 1).
A large response was observed up to 40 kg K/ha, while plateau
yields were only reached at around 120 kg K/ha. Similar results
were seen for rice straw yields (Figure 2).
Little soil analysis data and no plant sample data has been
collected yet due to a lack of instrumentation in the lab
facilities locally. However, this experiment may have serious
imolications- for agricultural production packages in this area.
which in the past have tended to downplay the need for K fertili-
zation. More data is being collected presently, with soybeans as
the next crop in the rotation.













Table 1.


Rice grain and straw yields at 3 rates of lime in
Sitiung 2.


Lime Rate
(t/ha)


0. 375
1.5
5.0


grain


1.46
1.66
1.72


Yield (t/ha)
straw

3.5
Z3.7
3.6


Table 2. Rice grain and straw yields at 6 K levels in Sitiung 2.


Potassium Rate
(t/ha)


40

120
240


Yield (t/ha)
grain straw


0.66
1.27
1.64
1.64
2.15
2.31


1.7
3.0
3.8
3.9
4.4
4.9


































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