Effects of Foliar Fertilization on Nutrient Uptake, Yield, and Fruit Quality of Pomelo (Citrus grandis Osbeck) Grown in the Mekong Delta Soils

Table 2

Concentrations of P, K, Mg, and Zn in leaves (dry weight).

Factor

2019

2020

2021

P

K

Mg

Zn

P

K

Mg

Zn

P

K

Mg

Zn

g kg^−1

mg kg^−1

g kg^−1

mg kg^−1

g kg^−1

mg kg^−1

(A) Foliar fertilizers

Control

1.22^b

17.2^b

2.49^b

26.1^b

1.22^b

16.9^b

2.49^b

27.2^b

1.30^b

18.0^b

2.52^b

25.6^b

FF1

1.60^a

21.4^a

2.78^a

26.2^b

1.66^a

21.9^a

2.87^a

26.7^b

1.62^a

20.8^a

2.88^a

25.3^b

FF2

1.58^a

21.0^a

2.83^a

29.5^a

1.61^a

22.9^a

2.75^a

29.2^a

1.60^a

20.8^a

2.88^a

29.6^a

FF3

1.29^b

18.4^b

2.52^b

29.0^a

1.23^b

17.1^b

2.52^b

29.6^a

1.24^b

18.0^b

2.41^b

28.5^a

(B) Experimental sites

HG A

1.41

19.2

2.70

28.1

1.45

19.7

2.72

29.0

1.43

19.1

2.69

26.8

HG B

1.42

19.7

2.62

27.8

1.42

19.8

2.62

28.5

1.47

19.6

2.70

27.8

HG C

1.44

19.6

2.66

27.2

1.43

19.6

2.63

27.0

1.43

19.5

2.63

27.1

F (A)

F (B)

ns

ns

ns

ns

ns

ns

ns

ns

ns

ns

ns

ns

F (A × B)

ns

ns

ns

ns

ns

ns

ns

ns

ns

ns

ns

Different lowercase letters indicate significant differences at P < 0.05 (^∗), P < 0.01 (^∗∗), and P < 0.001 (^∗∗∗); ns, not significant; FF1: 29.7 P2O5, 5.0 K2O, 6.7 MgO (% w/w); FF2: 29.7 P2O5, 5.0 K2O, 4.5 MgO, 6.0 Zn (% w/w); FF3: 35 Zn (% w/w).