Table 5 Interaction of irrigation treatments (100%, 85% and 70% ETc), kaolin application (0%, 3% and 6%) in 2017 and (0%, 1.5% and 3%) in 2018 and cultivar on some biochemical characteristics of leaves of ʻGolabʼand ʻShafi-Abadiʼ apples

100% ETc

 0% Kaolin

4.09^d ± 0.41

24.01^bc ± 3.86

19.32^d ± 6.24

6.86^c,d ± 0.89

2.83^e ± 0.60

23.60^a ± 4.25

 1.5% Kaolin

–

–

–

–

3.68^d,e ± 0.62

24.84^a ± 0.95

 3% Kaolin

4.61^c,d ± 0.38

20.31^d ± 3.21

22.45^c ± 5.76

6.96^b,c,d ± 0.81

4.13^c,d ± 0.57

16.74^b ± 2.15

 6% Kaolin

4.51^c,d ± 0.74

20.31^d ± 3.15

25.62^a,b ± 8.10

6.48^d ± 0.75

–

–

85% ETc

 0% Kaolin

4.72^c ± 0.49

22.97^c,d ± 3.05

23.08^b,c ± 4.71

7.64^a,b ± 1.60

5.13^c ± 0.44

25.00^a ± 3.88

 1.5% Kaolin

–

–

–

–

4.99^c ± 0.46

17.73^b ± 3.23

 3% Kaolin

5.00^b,c ± 0.45

24.76^b,c ± 3.89

24.05^bc ± 7.06

7.11^b,c,d ± 1.46

4.83^c,d ± 0.29

16.02^b ± 2.02

 6% Kaolin

5.6^a ± 0.77

24.69^b,c ± 3.51

23.93^b,c ± 8.01

6.88^c,d ± 1.38

–

–

70% ETc

 0% Kaolin

5.35^a,b ± 0.62

23.38^b,c ± 4.14

27.14^a ± 5.22

7.32^b,c ± 1.35

8.05^a ± 0.22

23.73^a ± 5.68

 1.5% Kaolin

–

–

–

–

6.69^b ± 0.64

16.33^b ± 1.08

 3% Kaolin

5.39^a,b ± 0.61

25.94^b ± 3.74

28.34^a ± 5.51

7.64^ab ± 1.36

6.44^b ± 0.55

18.66^b ± 1.16

 6% Kaolin

5.58^a,b ± 0.80

32.46^a ± 4.18

28.34^a ± 7.35

8.26^a ± 1.25

–

–