Table 6 Water deficiency rates and some irrigation system types effectiveness on tree yield, hypothetic yield per feddan, water use efficiency, and water unit return of Washington navel orange trees (2021–2022 seasons)

First season (2021)

 ETc 100%

57.68^a

12.11^a

2.47^a

9.90^a

 ETc 80%

46.15^b

9.69^b

2.47^a

9.90^a

 ETc 60%

25.79^c

5.42^c

1.84^b

7.38^b

 DIS

41.25^b

8.66^b

2.15^b

8.62^b

 MSIS

45.17^a

9.48^a

2.37^a

9.50^a

 ETc 100% × DIS

55.56^b

11.67^b

2.38^b

9.53^b

 ETc 100% × MSIS

59.80^a

12.56^a

2.57^a

10.26^a

 ETc 80% × DIS

44.45^d

9.33^d

2.38^b

9.53^b

 ETc 80% × MSIS

47.84^c

10.05^c

2.57^a

10.26^a

 ETc 60% × DIS

23.73^f

4.98^f

1.70^d

6.79^d

 ETc 60% × MSIS

27.85^e

5.85^e

1.99^c

7.96^c

Second season (2022)

 ETc 100%

58.03^a

12.19^a

2.58^a

10.33^a

 ETc 80%

46.42^b

9.75^b

2.58^a

10.33^a

 ETc 60%

26.73^c

5.61^c

1.98^b

7.93^b

 DIS

41.93^b

8.81^b

2.28^b

9.11^b

 MSIS

45.53^a

9.56^a

2.49^a

9.94^a

 ETc 100% × DIS

56.03^b

11.77^b

2.49^b

9.97^b

 ETc 100% × MSIS

60.03^a

12.61^a

2.67^a

10.68^a

 ETc 80% × DIS

44.83^d

9.41^d

2.49^b

9.97^b

 ETc 80% × MSIS

48.02^c

10.08^c

2.67^a

10.68^a

 ETc 60% × DIS

24.94^f

5.24^f

1.85^d

7.40^d

 ETc 60% × MSIS

28.53^e

5.99^e

2.12^c

8.46^c