Subdual of stationary thresher machine for chopping resudies

4- moisture content. 

Fig.(5): the relation between the cutting length percentage % and 

categories of cutting length at different moisture content for different 

crop residues. 

---

 Misr J. Ag. Eng., July  2007 

  

                            

                                                        

 

 

515 

0

10

20

30

40

50

60

70

80

90

< 3.5

cm

3.5-10

cm

> 10

cm

< 3.5

cm

3.5-10

cm

> 10

cm

< 3.5

cm

3.5-10

cm

> 10

cm

Rice straw

Corn stalks

cotton stalks

Categories of  cutting length ,cm

Th

e

 c

u

tt

ing l

e

ng

th

 pe

rc

e

n

ta

g

e

,%

.

concave clearance =3 cm

concave clearance =4 cm

concave clearance =5 cm

The obtained results indicated that increasing moisture content from 6.5 

to 14.3%, decreased the percentage of cut length of <3.5 cm (first 

category) from 82.1 to 68.2 % of rice straw, from 85.6 to 70.3 % of corn 

stalks and from 80.1 to 70.1 %of cotton stalks respectively. While the 

second and third categories (3.5 -10 cm and <10 cm)  was increased from 

14.4 to 22.9 % and 3.5 to 8.9%of rice straw, from 10.1 to 22.5% and 4.3 

to 7.2% of corn stalks and from 14.7 to 21.4 % and 5.2 to 8.5 % of cotton 

stalks respectively at 4 cm

2 

oval slots concave, 1.5 ton/h feed rate, 

18.3m/s drum speed and 3 cm drum-concave clearance. 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Fig.(5): the relation between the cutting length percentage % and categories of 

cutting length at different moisture content for different crop residues.