| Material Information
||Effects of post clearing methods on soil properties and crop production
||TropSoils field research brief ;, 24
||2, 1 leaves : ill. ; 28 cm.
Wade, M. K. (Michael Karl)
Lembaga Penelitian Tanah.
Soil Management Collaborative Research Support Program.
||Soil Management Collaborative Research Support Program, North Carolina State University,
||Soil management -- Indonesia.
Burning of land -- Indonesia.
Liming of soils -- Indonesia.
Crop yields -- Indonesia.
||At head of title: TropSoils-Indonesia, Centre for Soil Research.
| Record Information
||University of Florida
||All rights reserved by the source institution and holding location.
||oclc - 156976252
Centre for Soil Research
Field Research Brief No. 24.
Title: Effects of post clearing methods on soil properties and
Experiment #: 1107
Researchers: Fahmuddin Agus, M.K. Wade, and Jusf
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 orthotic tropudult.
(FCC: Ceak) The site was manually cleared in August, 1984
from selectively harvested primary forest.
Experimental Design: Strip factorial plot arrangement 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 rzeaining
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 (Ll).(4./t /
Crop History: Rice variety GH 330 was planted in September,
1985. This is the third crop after soybeans and
peanuts in this trial. Base fertilization in Kg/ha
was 120 urea (triple split application), 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 :he 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 after flowering,
due to high rainfall at that time. A severe incidence
of stem borer occurred and grain yields were deva-
stated. 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 positive
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
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 Al 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)
pH Al K P
meq/l00g -K, i a
4.6 1.5 4o7 2.6
4.8 1.4 .z100 '* 3.0
4.9 1.3 .3 14D .oft 3.4
Table 2. Effect of tillage and
burning on organic C (18 months
Tillage No' burn lx burn 2x burn
--- - C - -
No tillage 1.91 1.84 1.91
Tillage 1.86 1.58 1.68
- "i~li^'r a ** *
^ -'-., Ja"..^
Table 3. Effect of burning, tillage,
Al (18 months after initial
no lime + lime
and liming on exchangeable / I
treatment 4f e
no lime + lime
BOTO BITO BZTD BoTI oT TI B S.TI
Efed o'f bUniM od,
-;i/A-e o0'1 Rice 8o"asS Yre/d