Citation
Phosphoros rates and methods of application

Material Information

Title:
Phosphoros rates and methods of application
Series Title:
TropSoils field research brief ; 3
Creator:
Wade, M. K. (Michael Karl)
Djoko Santoso.
Soil Management Collaborative Research Support Program.
Place of Publication:
Raleigh, NC
Publisher:
Soil Management Collaborative Research Support Program, North Carolina State University,
Publication Date:
Language:
English
Physical Description:
2, 2 leaves : ill. ; 28 cm.

Subjects

Subjects / Keywords:
Soil management -- Indonesia.
Soils -- Phosphorus content -- Indonesia.
Soil chemistry -- Indonesia.
Spatial Coverage:
Indonesia -- Sumatra

Notes

General Note:
Caption title.
General Note:
"April, 1984."
General Note:
At head of title: TropSoils-Indonesia.

Record Information

Source Institution:
University of Florida
Holding Location:
University of Florida
Rights Management:
The University of Florida George A. Smathers Libraries respect the intellectual property rights of others and do not claim any copyright interest in this item. This item may be protected by copyright but is made available here under a claim of fair use (17 U.S.C. §107) for non-profit research and educational purposes. Users of this work have responsibility for determining copyright status prior to reusing, publishing or reproducing this item for purposes other than what is allowed by fair use or other copyright exemptions. Any reuse of this item in excess of fair use or other copyright exemptions requires permission of the copyright holder. The Smathers Libraries would like to learn more about this item and invite individuals or organizations to contact Digital Services (UFDC@uflib.ufl.edu) with any additional information they can provide.
Resource Identifier:
156908485 ( OCLC )

Full Text

TROPSOILS
PUSLITTAN
WEST SUMATERA


TROPSOILS-Indonesia
Field Research Brief No. 3
April, 1984


TITLE: 1502. Phosphoros Rates and Methods of Application

RESEARCHERS: Mike Wade and Djoko Santoso

OBJECTIVES: 1. Determine optimum rates of P fertilizer on a
newly cleared soil (Paleudult),
2. Determine cost:benefit ratio of various methods
of applying TSP fertilizer,
3. Study the long term effects of various P
management (rates and methods) on crop
production and soil P levels,
4. Determine critical F soil test values for rice
and peanuts.

SOIL: Paleudult, LCeak; located in Sitiung Vc, forest cleared in
82/83 wet season, experiment initiated in December, 1983.

TREATMENTS: Randomized Complete Block with 3 replications, 4X6m
plots.


1. no P
2. 20 kg P broadcast
3. 40 kg "
4. 80 kg P
5. 20 kg P banded
6. 40 kg P'
7. 80 kg P "


8. 20 kg P in dibble hole
beside seed hole
9. 20 kg P in seed-hole
10. 20 kg P banded between
every other row
11. 80 kg P broadcast plus
2T lime, 50 kg K, 100 kg
MgS04 per hectare


Treatments 1-10 receive no base fertilizer, just P as
indicated. Lime, Ca(OH)2, is applied as a surface
broadcast at 325 kg/ha over the peanut rows after
planting as a Ca source.

The P treatments were applied at the rates indi-
cated on both of the first two crops, peanuts and mung
beans. Soil analysis indicated a build-up of P in all
but the zero plots. Therefore this third crop, rice,
was grown on the residual treatments, i.e. no new P
was applied.


CROP: This report covers the third crop in the experiment,
upland rice (cv. Arias, a selected, local variety). It was
planted in September, 1984 and harvested in February, 1985.
Spacing was 25 x 25cm, and 75 kg N (as urea)/ha was applied as
base fertilizer, 1/2 at 3 weeks and 1/2 at flowering.

RESULTS: Both grain yields and stover yields are shown
graphically in Figure 1 as affected by treatments, or actually










the residual of those treatments as no additional P was applied
to the rice. Grain yields were quite low. Although the variety
is a local one, supposedly tolerant to disease and pests, it was
in fact heavily attacked by sheath blight and stem borer.
Panicles were unusually small with a high percentage of empty
grains. Vegetative growth however was phenomenal, as indicated
by the very high dry matter yields. This is a more or less
predicted result for high fertility experiments when using local
varieties. Because this is a low-input experiment, with only
treatment 11 getting anything other than N fertilizer, a local
variety was thought-to-be the best choice but apparently was not.

There was a dramatic response to P (any rate or method of
application) compared to the control. However there were no
significant differences among any rate or method of application
for either grain or stover yield. Figure 3 shows basically a two
poi-nt-r-esponse curve, the zero and all the rest at plateau yield.
The residual of the first two applications, even at the lowest
rate (2 x 20 kg/ha), was sufficient P (+/-10 ppm by mod. Olsen)
for the rice.

Comparison of the three consecutive crops shows considerable
differences in their response to extractable soil P, with
peanuts > mung beans > rice. As the cycle is repeated in
subsequent seasons we can see if these extractable P vs yield
relationships hold over time.










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