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

Table 3

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

Factor

2019

2020

2021

P

K

Mg

Zn

P

K

Mg

Zn

P

K

Mg

Zn

mg 100g^−1

mg 100g^−1

mg 100g^−1

(A) Foliar fertilizers

Control

27.3^b

167^b

5.13^b

0.22

27.3^b

149^b

5.31^b

0.19

27.5^b

154^b

5.37^b

0.20

FF1

30.9^a

197^a

5.60^a

0.22

30.5^a

197^a

5.73^a

0.19

30.4^a

228^a

5.71^a

0.20

FF2

30.8^a

200^a

5.44^a

0.21

31.3^a

205^a

5.79^a

0.21

30.9^a

210^a

5.74^a

0.22

FF3

27.6^b

165^b

5.29^b

0.19

27.5^b

159^b

5.31^b

0.22

28.0^b

156^b

5.35^b

0.22

(B) Experimental sites

HG A

28.9

185

5.37

0.21

29.0

174

5.53

0.20

29.3

187

5.59

0.21

HG B

29.5

178

5.38

0.20

29.6

177

5.55

0.20

29.1

187

5.50

0.21

HG C

29.0

185

5.36

0.21

28.9

181

5.54

0.21

29.3

186

5.55

0.21

F (A)

ns

ns

ns

F (B)

ns

ns

ns

ns

ns

ns

ns

ns

ns

ns

ns

ns

F (A × B)

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).