Table 3 Impact of compost and nano-micronutrients combinations on photosynthetic pigments (mg g^− 1 fresh leaf weight) of sugar beet in calcareous areas during 2022/2023 and 2023/2024 seasons.

Zero

Without spraying

2.8

3.24

1.07

1.52

0.47

0.6

Fe + Mn

2.99

2.25

1.05

1.38

0.35

0.58

Fe + B

3.32

2.86

1.14

1.65

0.49

0.72

B + Mn

3.35

3.66

1.31

1.72

0.55

0.73

B + Mn + Fe

3.69

4.21

1.37

2.06

0.56

0.81

3

Without spraying

3.51

3.15

1.29

1.85

0.54

0.85

Fe + Mn

3.99

3.25

2.05

2.38

0.75

1.08

Fe + B

3.32

3.86

2.14

2.65

0.89

1.02

B + Mn

4.35

3.66

2.31

2.72

0.95

1.03

B + Mn + Fe

4.69

4.21

2.37

3.06

0.96

1.09

6

Without spraying

3.86

4.1

1.44

1.96

0.5

0.81

Fe + Mn

4.99

4.25

2.05

2.38

1.05

1.08

Fe + B

4.32

4.86

2.14

2.65

1.09

1.02

B + Mn

4.35

4.66

2.31

2.72

1.05

1.03

B + Mn + Fe

4.69

5.21

2.37

2.06

1.16

1.01

LSD at 0.05

0.03

0.06

0.05

0.03

0.08

0.07