Citation
Response of soybeans and soil K levels to K fertilization and green manure applications at Sitiung 5

Material Information

Title:
Response of soybeans and soil K levels to K fertilization and green manure applications at Sitiung 5
Series Title:
TropSoils field research brief ;, 13
Creator:
Gill, Dan.
Kasno, Antonius.
Adiningsih, J. Sri
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, 1 leaves : ill. ; 28 cm.

Subjects

Subjects / Keywords:
Soils -- Potassium content -- Indonesia.
Green manuring -- Indonesia.
Soybean -- Yields -- Indonesia.
Spatial Coverage:
Indonesia. -- Sumatra

Notes

General Note:
Caption title.
General Note:
"June, 1985."
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:
156912920 ( OCLC )

Full Text
TROPSOS3LS
PUSLTTAN
WEST SUMATTERA
TROPSOILS INDONESIA
Field Research Brief #13
June, 1995
7itle: Response of Soybeans and Soil K Levels to K Fertilization
ano Green Manure Applications at Sitiung 5
Experiment #: 3501
Researchers: Dan Gill, Antonius Kasno ano J. Sri Adiningsih
Objectives: 1. To examine the effects of K rates and residue
management/green manure treatments on soyoean
yields and soil K levels.
2. To observe the effect of green manuring on K, Ca
and Mg retention within the profile of a udult
in Sitiung 5.
Soil: Udult, probably an ortnoxic tropudult (to be positively
identified when complete lab data become available). FCC: Ceak.
Treatments: This experiment was an incomplete factorial set out in a randomized complete block design with 3 reolications. Seven rates of K were applied: 0, 10, 20, 40. S0, 120, and 240 k K/ha. Three residue/green manure treatments were installed on both a 0 and a 80 kg K/ha plot. These treatments were: rice straw remove, rice straw incorporated and rice straw + Calopogonium so. 3.4 t/ha dry weight) incorporated.
Crop History: Soybean cultivar "Orba" was planted using
commercial inoculum on 7 March at a 20 X 40 cm spacing. A blanket application of 100 kg/ha TSF and 125 kg kieserite (MgSO4) w.as incorporated before planting, while rice straw from the
previous crop was removed except as indicated above for the
stover and green manure treatments. Pest problems were minimal. Harvest of 2/3 of the plots occurred on 4 June (89 days) and the remainder was harvested 8 June (93 days).
Results: This crop grew well, being fortunate to have good
rainfall distribution and low pest pressures. The crop responded strongly to K, more than doubling yields with only 10 kg K/ha (Figure i), "whil-e pl-ateau yields were achieved at 120 ko/ha. Results of the different residue management treatments are shown in Table 1, clearly demonstrating the importance of residue management in developing any cropping systems package for this area. Incorporated straw from the previous rice crop more than :oubled yields at the 0 K rate and at 80 kg K/ha, it increased yields to almost 2.5 t/ha, extremely good yields for this area. Bean yields as high as those on the K response plateau were
obtained at the 0 K level by adding both rice straw and
Calopogonium.




;able 1. Soybean yield with several residue management treatments
and at 2 K application rates.
Soybean Yield (t/-a)
Appiied K
' (kg /ha) 30
1.Rice straw removed 0.59 1.67
Residue
2.Rice straw incorporated 1.2 :2.48
Management
3.Rice straw + Caloponium 2.20 2.37




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Full Text
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