TROPSO r L S
PuSLIT TAN
E T 9UMArERA





TROPSOILS INDONESIA
Field Research Brief # /.

Title ,: Effects of post clearing methods on soil properties and
crop production
Experiment # : 1107
Researchers : Fahmuddin Agus, Michael K. Wade, Jusuf
Prawirasumantri
Objectives : To examine the effects of burning, tilling and
liming on a newly cleared Ultisol
To examine the interaction between burning and
liming
Soil : Clayey, Kaolinitic, Isohyperthermic Orthoxic
Trogudult. This is a newly cleared selected cut-
primary forest. Cleared in August 1984 by using
chain saw for slashing and human labor for
windrowing and clearing
Exp. design : Strip factorial plot design with 3 replications,
sub-sub plot of 48 m2. Main plots 3 burning
methods: No burn, one time burn, and two times
burn. Sub-plots tilling methods: No till and
minimum tillage. Sub-sub-plots lime rates:
equivalent to 0 and 1.5 me exchangeable Al.
No lime addition was applied in the second crop
because the exchangeable aluminum content of the
limed plot was still very low.
Crop history : Peanut of Gajah variety was planted May 4, 1985.
Base fertilization (kg/ha) -60 urea, 400 TSP and
120 KCL, and 80 kieserite. Thiodan had been used a
few times to control pests damages. Harvest was
done on August 20, 1985.
Results : Tilled plots gave significantly higher pod yield
over no tilled ones under no burn, but was not significant on the
burned plots. This difference was not seen in biomass weight.
Liming also gave significant increase on pod yield and shelling
percentage at all burn levels, but no significant difference in
biomass weight. Results of soil analysis is not yet available.


















Effect of Burning, Tillage and Liming
on Pe-inut POS Yidd (kg/b-a)
1.39-
1.8- '

.1.7- >_3___ _2 ___,

1.9- I ./ / /- /-

1.7 -


CL,




0.5
1A-



. 0.
0 .16' .. "' -,




S,/'/ / r'// .t
_ o_2.9


0.1-. -- .. "/ *" "




o. d e I 9 h 1/y I







Legends:
a = BoToLo e = BlToLo i = B2ToLo
b = BoToLl f = BIToLl j = B2ToL1
c = BOT1Lo g = B1T6Lo k = B2T1Lo
d = BoT1L1 h = B1T1L1 1 = B2T1L1
d = BoT1L1 h = B1T1L1 1 = B2T1L'1