Correlation (R) between toxic concentration in soil environment and activity (A) of Phosphatase enzyme in alum-resistant and alum-resistant plants.

Table 5: Correlation (R) between toxic concentration in soil environment and activity (A) of Phosphatase enzyme in alum-resistant and alum-resistant plants.

Plants	A - SO₄^2-	A -Fe²⁺	A - Al³⁺	A - P₂O₅
Cà Dung	-0.3648	-0.5601	-0.6462^***	+0.6441^***
IR38	-0.5001	-0.6239	-0.8972	+0.4427

Note: A: Phophatase enzyme activity in plants (R0,95 = 0,6320)

That allows us to deduce that phosphorus and phophatase play a large role in the mechanism of plant poison resistance to toxins in the soil environment.

(^***: Eleocharis dulcis, A: phosphatase activity)