Study of biodegradable pp bags in mushroom cultivation

 

Yang.S.R and J.C.Huang

Horticulturist and assistant researcher,respectively,Tainan District Agricultural Improvement

Station,COA.350 Section 1, Lin-shen Rood, Tainan,701. Taiwan,Republic of China

E-mail：sryang@mail.tndais.gov.tw.；jchuang@mail.tndais.gov.tw.

 

Summary

 

The masterbatches of Degra-Novon, IAD 2025 were incorporated in PP resins to produce biodegradable PP bags for ganoderma culture. The results indicated that the percentage of molding of biodegradable PP bags were 13.3~19% higher compared to regular PP bag,75 days after inoculation. There were no difference in size of fruiting body of ganoderma cultured in biodegradable PP bag, but the yields were lower in biodegradable PP bags compared to regular PP bag. The macro-elements content also were not difference in fruiting body and culture media of used biodegradable PP bags, respectively, compared to regular PP bag. Although, the physical properties of used biodegradable PP bag has been down to 7.5﹪and 47.8kg/cm2 from 540﹪and 151.6 kg/cm2 in elongation and tensile, respectively,247 days after inoculating and composting,but the degradation of used biodegradable PP bag still did not completely decompose, The formula of masterbatches incorporated in PP resins should be modified in advance study.

 

Key  Words：Biodegradable PP bags, mushroom

 

Table 1.Percentage of molding of ganoderma cultured in biodegradable pp bags after inoculation

% of ECO-3＊

(%)

Light transparenee

（%）

Molding（%）

5月29日**

PP bags（NO）

20 IAD2025

30 IAD2025

35 IAD2025

Regular PP

90.8

86.4

86.3

93.3

27.1

25.0

21.4

8.1

87

88

82

139

＊：Masterbatches of Novon

＊＊：Inoculating-investigating date：13/3/2001~ 29/5/200

 

Table 2.Yields of ganoderma cultured in biodegradable PP bags

% of ECO-3*

 

(%)

Size of pileus (cm)

Yields/PP bag (g)

1st crop

2 nd crop

1st crop

2 nd crop

Height

(cm)

Width

(mm)

Thickness

(mm)

Height

(cm)

Width

(mm)

Thickness

(mm)

20 IAD2025

30 IAD2025

35 IAD2025

Regular PP

12.6a＊＊

11.7a

11.7a

12.6a

11.9a

10.4a

11.0a

11.4a

20.6a

17.8ab

17.3b

19.1ab

5.8a

5.8a

5.8a

5.8a

6.6a

7.2a

7.3a

7.3a

18.8a

18.9a

17.0a

17.3a

40.8

44.0

43.8

57.2

22.4

25.1

26.2

32.6

＊：Masterbatches of Novon

1st crop：13/3/2001~20/6/2001 & 28/6/2001

2nd crop：13/7/2001~28/8/2001

＊＊：Values within each column followed by the same letter are not significantly different at 5﹪level.

 

Table 3.Organic matters & pH of ganoderma cultured in biodegradable PP bags(2nd crop)  

 

% of ECO-3＊

(%)

O.M.**

(%)

pH

(1：10)

20 IAD2025

30 IAD2025

35 IAD2025

Regular PP

96.5

96.5

97.0

96.5

5.22

5.20

5.14

5.11

＊：Masterbatches of Novon

＊＊：Inoculating-investigating date：13/3/2001~28/8/2001

 

Table 4.Macro and micro elements content of ganoderma cultured in biodegradable PP bags(1st crop)

% of ECO-3＊

(%)

Macro-elements **

Micro-elements

N

P

K

Ca

Mg

Zn

Cu

Fe

Mn

(%)

(ppm)

20 IAD2025

30 IAD2025

35 IAD2025

Regular PP

2.32

2.16

2.03

1.99

0.21

0.20

0.21

0.22

0.55

0.48

0.55

0.49

0.007

0.009

0.009

0.015

0.052

0.052

0.055

0.058

8.75

11.25

11.25

11.25

8.75

11.25

11.25

11.25

40.0

70.0

62.5

81.3

3.75

3.75

3.75

5.0

＊：Masterbatches of Novon

＊＊：Inoculating-investigating date：13/3/2001~28/8/2001

 

Table 5.Macro and micro elements content of ganoderma cultured in biodegradable PP bags (2nd crop)

% of ECO-3＊

(%)

Macro-elements **

Micro-elements

N

P

K

Ca

Mg

Zn

Cu

Fe

Mn

(%)

(ppm)

20 IAD2025

30 IAD2025

35 IAD2025

Regular PP

2.34

2.51

2.23

2.39

0.39

0.42

0.35

0.36

1.22

1.19

1.17

1.13

0.021

0.020

0.020

0.030

0.091

0.084

0.078

0.084

20.0

22.5

21.3

22.5

5.0

6.25

3.75

3.75

65.0

93.8

53.8

66.3

2.5

2.5

2.5

2.5

＊：Masterbatches of Novon

＊＊：Inoculating-investigating date：13/3/2001~28/8/2001

Table 6.Macro and micro elements content of ganoderma cultured in biodegradable PP bags

% of ECO-3＊

(%)

Macro-elements **

Micro-elements

N

P

K

Ca

Mg

Zn

Cu

Fe

Mn

(%)

(ppm)

20 IAD2025

30 IAD2025

35 IAD2025

Regular PP

1.17

1.06

1.13

1.12

0.32

0.31

0.32

0.31

0.78

0.66

0.72

0.56

1.49

1.27

1.11

0.04

0.394

0.350

0.369

0.325

36.3

37.5

32.5

32.5

11.25

11.25

8.75

8.75

781

2,031

938

625

116

114

101

99

＊：Masterbatches of Novon

＊＊：Inoculating-investigating date：13/3/2001~28/8/2001

 

Table 7.Physical properties of biodegradable PP bags before testing and after harvesting and composting in ganoderma cultivation

 

Elongation BP (MD/TD,%)

Tensile BP (MD/TD,kg/cm2)

%ECO-3＊

After

(%)

Before testing

After harvesting

Before composting  

Before testing

After harvesting

Before composting  

20 IAD2025

30 IAD2025

35 IAD2025

Regular PP

540.7/430.7

558.9/552.3

539.4/590.2

653.2/781.6

5.7/3.4

8.3/3.2

10.0/4.0

518.3/346.2

4.6/10.6

7.1/6.2

10.3/5.8

-

158.3/107.

152.8/108.3

144.8/112.1

264.3/288.3

80.2/34.8

91.5/35.4

91.7/49.7

298.6/204.2

38.1/73.4

45.7/39.2

57.4/35.1

-

＊：138 days after inoculating (13/3~28/8/2001)

＊＊： 109 days after composting (11/9~29/12/2001)

 

 

　

Fig 2.Elongation of biodegradable PP bags for mushroom cultivation after QUV exposure

　

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