The Population Density of Oligo and Copiotrophic Soil Bacteria on Vegetable Fields under Different Soil Management Practices in Candikuning Village of Tabanan Regency.

The Population Density of Oligo
and Copiotrophic Soil Bacteria on Vegetable Fields
under Different Soil Management Practices
in Candikuning Village
of Tabanan Regency

A.A.I. Kesumadewi
IM Sudana
IM Adnyana
IW Suarna
ICBB 2015

Background

Benites, 2004

Soil Management
Keterangan
Location
Soil Subklas

Reforested
Area

Landuse1)
Monoculture of Monoculture of Strip
Lettuces
Leek
intercropping

Candikuning
Village

Kembangmerta

Bukitcatu

Pemuteran dan
Batusesa

Vitric

Ustivitrand

Vitric
Ustivitrand

Vitric
Ustivitrand

Vitric
Ustivitrand

-

15-20

35-45

20-30

-

180
900
-

600
75
-

450
900
675
600

Fertilizers had
been applied
(ha-1 year-1:
- Chicken
manure (ton)
- Urea (kg)

- ZA (kg)
- TSP (kg)
- KCl (kg)

Selected Soil Chemical Properties
Landuse
Soil Chemical Properties

pH

Reforested
Area

Monoculture Monoculture Strip
of Lettuces
of Leek
intercropping

6,2 a

5,75 b

6,10 ab

5,70 b

2,95 a

3,09 a

3,04 a

3,39 a

CEC (me 100g-1)

24,25 b

18,75 b

21,58 ab

25,51 a

BS (me 100g-1)

95,50 a

47,71 a

62,75 a

43,10 a

Total-N (%)

0,13 c

0,27 b

0,25 b

0,29 a

NH4 (µg N g-1)

2,67 a

1,34 a

1,65 a

1,68 a

NO3 (µg N g-1)

13,42 b

39,37 a

21,19 a

26,73 a

Avail-P (ppm P205)

32,30 b

169,20 a

195,17 a

192,89 a

Exch-K(ppm K20)

33,40 ab

160,76 b

395,11 a

262,51 ab

Organic-C(%)

The pronounced effect of intensive vegetable
production in Candikuning Village on soil properties :
• increased soil organic matter and macro nutrients
content
• Reduced some of soil microbiological properties
• Oligo and copiotrophic population ?

Experiment
• Purposive soil samplings (20 soil samples with 5
replications)

Bulk soil

Rizosphere

Full strenth of NA
(Copiotrophic), 7 days
100 fold of NA
(Oligotrophic), 28 days

Result
Population of Oligo and Copiotrophic Bacteria in Bulk Soils
Oligotrophic

Population Density (105 g DM-1)

800

Copiotropic

700
600
500
400

300
200
100
0
Reforested

Monoculture of
Lettuces

Monoculture of
Leek

Landuses

Strip
intercropping

Ratio of Oligo/Copiotrophic in Bulk Soils

1.00
0.90
0.80

Ratio

0.70
0.60
0.50
0.40
0.30
0.20
0.10

0.00
Reforested

Monoculture
of Lettuces

Monoculture
of Leek

Landuses

Strip
intercropping

Population Density of Oligo and Copiotrophic Bacteria in Rizosphere
Oligotrophic

Population Density (105 g DM-1)

900

Copiotropic

800
700
600
500
400
300
200
100
0
Reforested

Monoculture of
Lettuces

Monoculture of
Leek

Landuses

Strip
intercropping

Ratio of Oligo/Copiotrophic

1.20
1.00

Ratio

0.80
0.60
0.40
0.20
0.00
Reforested

Monoculture of
Lettuces

Monoculture of
Leek

Landuses

Strip
intercropping

Conclusion
• Oligotrophic bacteria were dominant (p