| Material Information
||Response of upland rice and soil base levels to applied K at three lime levels in Sitiung 2
||TropSoils field research brief ; 6
||3 leaves : ill. ; 28 cm.
Wade, M. K. (Michael Karl)
Soil Management Collaborative Research Support Program.
||Soil Management Collaborative Research Support Program, North Carolina State University,
||Soil amendments -- Indonesia
Soils -- Potassium content -- Indonesia.
Liming of soils -- Indonesia.
Rice -- Yields -- Indonesia.
||At head of title: TropSoils-Indonesia.
| Record Information
||University of Florida
||All rights reserved by the source institution and holding location.
||oclc - 156912256
Field Research Brief # 6
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
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.
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.
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.
Rice grain and straw yields at 3 rates of lime in
Table 2. Rice grain and straw yields at 6 K levels in Sitiung 2.
-i I 1 .- ._ ., I ,I .
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