Subdual of stationary thresher machine for chopping resudies

5-Drum- concave clearance. 

Fig.(6): the relation between the cutting length percentage % and 

categories of cutting length at different concave clearance for different 

crop residues. 

The obtained results indicated that increasing concave clearance from 3 

to 5 cm, decreased the percentage of cut length of <3.5 cm (first 

category) from 80.1 to 75.1 % of rice straw, from 82.3 to 76.4 % of corn 

stalks and from 78.3 to 74.1 %of cotton stalks respectively. While the 

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

15.4 to 16.7 % and 4.5 to 8.2 %of rice straw, from 14.2 to 16.5 and 3.5 to 

7.1% of corn stalks and from 16.3 to 17.4 % and 5.4 to 8.5 % of cotton 

---

 Misr J. Ag. Eng., July  2007 

  

                            

                                                        

 

 

516 

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