12

10

8

6

4

2

0

Treaments

C0C15 C30

C0+1/2

NP

C15+1/2

NP

C30+1/2

NP

Large tuberMedium tuberSmall tuber

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4540353025151050

C0C30

Treatment

Tub

er y

ield

(t h

a¯)1

21.6d

27.8b25.4cb

21.7cd

39.2a

20.8d

C0+1/

2NP

C30+1/

2NP

C15+1

/2NP

C15