Table 4: The influence of toxic substances in acid sulphate soil environment on the enzyme activity Phophatase in the roots indicates acid sulphate-resistant and acid-resistant rice plants.

The day after sowing

Toxic in soil environment

Acid sulphate soil

Non toxic soil

Eleocharis Dulcis

Type of rice plants

Eleocharis Dulcis

Type of rice plants

Cà Dung

IR38

Cà Dung

IR38

21

36

66

87

high

low

high

low

1.29

0.42

 small

small

1.29

0.34

 small

 small

0.96

small

small

small

0.14

0.42

Streaks

Streaks

3.50

0.30

Streaks

Streaks

2.21

0.41

Streaks

Streaks