Effects of post clearing methods on soil properties and crop production

Material Information

Effects of post clearing methods on soil properties and crop production
Series Title:
TropSoils field research brief ; 24
Agus, Fahmuddin.
Wade, M. K. (Michael Karl)
Prawirasumantri, Jusuf.
Lembaga Penelitian Tanah.
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:
2, 1 leaves : ill. ; 28 cm.


Subjects / Keywords:
Soil management -- Indonesia.
Burning of land -- Indonesia.
Liming of soils -- Indonesia.
Crop yields -- Indonesia.
Spatial Coverage:


General Note:
Caption title.
General Note:
"February, 1986."
General Note:
At head of title: TropSoils-Indonesia, Centre for Soil Research.

Record Information

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University of Florida
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University of Florida
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Resource Identifier:
156976252 ( OCLC )

Full Text
Centre for Soil Research
Field Research Brief No. 24.
February, 1986
Title: Effects of post clearing methods on soil properties and
crop production.
Experiment #: 1107
Researchers: Fahmuddin Agus, M.K. Wade, and Jusuf
Objectives: To study the effects of burning, tilling and liming
on the chemical and physical soil properties and
crop yield of a newly cleared Ultiscl.
Soil: Clayey, kaolinitic, isohyperthermic orthoic tropudult.
(FCC: Ceak) The site was manually cleared in August, 1984
from selectively harvested primary forest.
Experimental Design: Strip factorial plot arran-gement with 3
replications. Plot size is 6 X 8m. Strip plots are
burning methods: no burn (BO), IX (flash) burn (Bl)
and 2X (repile and complete burn of remaining
logs)(B2). Sub plots are 2 X 2 factorial of no-till (TO) and tillage (Tl) and no lime (LO) and limed at
1.5 X exchangeable Al (L1).(4/~
Crop History: Rice variety GH 330 was planted iz September,
1985. This is the third crop after soybeans and
peanuts in this trial. Base fertilization in Kg/ha
was 120 urea (triple split applicatio), 200 TSP, 100 KC1 and 80 kieserite. Lime was applied at the rate of 1 t/ha as maintenance on the limed plots, in addition to the 3 t/ha initial application at the beginning of
the trial. Curaterr (carbofuran) was applied at
planting, Sevin and Diazinon were applied alternately
at intervals during the season. However spraying
apparently was not frequent enough af:er flowering,
due to high rainfall at that time. A severe incidence
of stem borer occurred and grain yields were devastated. Harvest was done on January 14, 1986 with
plant dry weight (biomass) used as a measure of crop
Results: Tilling significantly increased plant height at 60 days after planting. No other treatment or interactions were significant at that stage. Tilling also consistently gave higher plant dry weight yield than no till (Figure 1), and it positivel interacted with burning. Under no till, burning had no effect on biomass production, but with tillage no ( lx ( 2x burn. Liming did not effect plant weight.

Results of soil chemical analysis available to date (samples taken on the day of harvest) include pH, Al, organic C, total N and available P and K. Burning has increased pH, K and P, and lowered Al (Table 1). It has not consistently affected C or N. However there is a burn by tillage interaction, as shown in Table
2. Burning under no till had no effect on %C in the soil, but with tillage it has decreased. This indicates that tillage is helping to "burn" the organic material, presumably by enhancing microbial decomposition.
Table 3 show the exchangeable Al levels as affected by the three factors. Burning had no effect on Al under the no til, no lime treatment (all high), nor under tillage, + lime (all low). However the effect is pronounced under no till, lime or tillage, no lime. Burning has been effective in reducing AI under marginal management, but not at the extremes.
These chemical parameters do not readily explain the positive crop response to burning under tillage (Figure 1). Physical parameters measured previously are not indicative of the response either. Therefore we have yet to identify why tillage and burning are beneficial to crop growth.
Table 1. Effect of post clearing burning on various soil
chemical properties. (18 months after burning)
Burn Organic Total Exchangeable Available
Treatment C % : N pH Al K P
m e q / 0 0 g -ii
none 1.89 0.12 4.6 1.5 .1 47 1 2.6
lx 1.70 0.11 4.8 1.4 .zS100 ?'*'f 3.0
2x 1.79 0.12 4.9 1.3 .3 14D .of 3.4
" .I ,
Table 2. Effect of tillage and burning on organic C (18 months after burning).
Tillage I burn lx burn 2x burn
No tillage 1.91 1.84 1.91
Tillage 1.86 1.58 1.68

,Table 3. Effect of burning, tillage, and liming on exchangeablpJ
Al (18 months after initial treatments). 4,'% eY'
no tillage
Bur __. n lm lime no lime + lime
Bur Trt no -2 - meq/10g siiT
none 1.7 1.6 1.7 1.0
lx 1.7 1.5 1.4 1.0
2x 1.6 1.2 1.1 1.1
1. Effed 0-'&IftjAM