Table 1 Biological activity of irrigated meadow-chernozem soil under perennial grasses at different levels of fertilization.

Bacteria on MPA, million CFU/g

23.1 ± 1.2

25.8 ± 5.4

29.0 ± 6.8

30.0 ± 5.4

28.1 ± 4.5

45.0 ± 9.4

26.7 ± 1.4

33.8 ± 4.5

Microorganisms on SAA, million, CFU/g

29.3 ± 2.6

27.9 ± 5.4

26.2 ± 2.8

32.3 ± 7.8

18.6 ± 4.8

34.9 ± 7.5

24.7 ± 2.5

31.7 ± 1.6

Nitrifiers, thousand, CFU/g

1.90 ± 0.4

3.07 ± 0.8

1.57 ± 0.3

2.71 ± 0.4

1.43 ± 0.1

1.64 ± 0.4

1.63 ± 0.1

2.47 ± 0.3

Fungi, thousand, CFU/g

18.8 ± 5.0

25.7 ± 1.8

68.6 ± 2.2

77.7 ± 4.8

14.6 ± 5.1

15.8 ± 3.8

15.4 ± 1.2

27.2 ± 5.4

Decomposition rate of cellulose, %

39.0 ± 3.7

36.7 ± 3.2

59.3 ± 3.6

48.3 ± 1.5

39.4 ± 1.7

32.6 ± 7.3

45.9 ± 7.5

39.2 ± 4.8

Nitrification capacity, N-NO₃, mg/kg

19.5 ± 1.4

26.4 ± 5.3

33.5 ± 6.2

25.6 ± 7.1

24.7 ± 2.5

21.0 ± 2.2

26.0 ± 5.2

24.3 ± 3.6

Total biological activity, %

100

106

100

110

100

126

100

114