Response of upland rice and soil K levels to K fertilization and green manure applications at Sitiung 5

Material Information

Response of upland rice and soil K levels to K fertilization and green manure applications at Sitiung 5
Series Title:
TropSoils research brief ; 1985:8
Gill, Dan
Kasno, Antonius
Adiningsih, J. Sri
Soil Management Collaborative Research Support Program
Place of Publication:
Raleigh, NC
Soil Management Collaborative Research Support Program, North Carolina State University,
Publication Date:
Physical Description:
3 leaves : ill. ; 28 cm.


Subjects / Keywords:
Soils -- Potassium content -- Indonesia.
Green manuring -- Indonesia.
Soil management -- Indonesia.
Rice -- Yields -- Indonesia.
Spatial Coverage:


General Note:
Caption title
TropSoils field research brief ;

Record Information

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University of Florida
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Resource Identifier:
156912564 ( OCLC )

Full Text


Title: Response of Upland Rice and Soil K Levels to K
Fertilization and Green Manure Applications at Sitiunq 5

Experiment #: 1501

-esearchers: Dan Gill, Antonius Kasno and J. Sri Adiningsih

objectives: 1. To examine the effects of K rates ano green
manure applications on rice yields and Soil
exchangeable K levels.
2. To compare the effects of 80 kg K/ha applied in
a single dose and in a split application.
3. To observe the effect of green manuring on Ca,
Mg and K movement and retention within one
profile of an ultisol in the Sitiung area.

Soil: Udult, probably an orthoxic tropudult cleared by bulldozers
I years ago, but never cropped. FCC: Ceak.

Treatments: Treatment design was an incomplete factorial set out
in a randomized complete block design with 3 blocks.
Seven rates of K were used: 0, 10, 20, 40, S05 120 and 240 kg K/ha. Green manure applications of 10 t/ ha of Calopogonium (fresh weight) were made to 2 separate plots with 0 and 80 kg K/ha applied. The final'treatment was a split application of 2 x 40 kg
K/ha at planting and at 57 days after planting.

Crop History: Cultivar "Sitiung" (GH 324) was planted on 12 Nov.
1984 with a blanket application of the following fertilizers (kg/ha): 65 urea applied once, 500 TSP, 125 kieserite, 5000 lime and 10 each of Mn, Zn and Cu sulfate. Carbofuran was applied at planting and diazinon and sevin were applied several times for insect control. Benomyl 50 W (Benlate) was sprayed once in an attempt to slow the development of
blast. Harvest--occurred on 28 Feb. 1985, 108 days
after planting.

Results: The crop-grew- well -initially, with a large response oeing observed visually to both K and green manure. Shortly after tiller initiation -leaf-blast symptoms became visible and a blast rating performed at this time showed K to be very effective in assisting the plants' 'resistance mechanism(s) (Table 1). However, the disease became progressively worse, with other symptoms perhapss Helminthosporium) also appearing. In the end, neck
blast and perhaps several other diseases caused complete panicle sterility- and harvest was only- possible for the straw. Straw weight showed a significant response to K, with maximum yields occurring around 120 kg K/ha (Figure 1). Data at lower levels of K application showed a greater degree of scatter and it is hoped that this variability will be accounted for by soil analysis data


which is not yet available. Calopogonium green manure was also very effective at decreasing blast incidence and increasing straw yields (Table 2), perhaps in large part because the 10 t/ha applied contained 60.1 kg K/ha. Split applying 80 kg K/ha was not more effective in producing straw yields than a single application (Table 3); in this experiment, it gave a significant decrease in yield, perhaps due to the fact that the second application occurred about the time the disease attack was becoming most severe. The experiment is continuing with a soybean crop, while measurements of soil physical as well as :hemical parameters are being undertaken to better understand the effect of the green manure.

Table 1.

The effect of K rates on blast rating and straw yields of upland rice at Sitiung 5.

Potassium Rate,

Blast Rating

Straw Yields
(t/ h a)

aC) 30


30-sp I i t

Table: 2.

SThe effect of green-manure applications on blast rating and straw yield at 2 K levels in Sitiung 5.

K rate (kg/ha)
0 80 Mean

K rate (kg/ha)
0 80 Mean

Green C Manure
(t/ha) 10

6 2

2 1

2. 27 3.56



4.57 6.59 5.58

1.17 .83
3.43 5.84 7.52 6.6S



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