Table 3 Effect of different NPK sources on total sugars and Vitamin C of Eureka lemon fruits during the experimental seasons of 2021 and 2022.

From: Partially substituting chemical NPK fertilizers and their impact on Eureka lemon trees (Citrus limon L. Burm) productivity and fruit quality

Treatments

Total sugars (%)

Vitamin C

Without-Bio NPK

With- Bio NPK

Mean

Without-Bio NPK

With- Bio NPK

Mean

First season; 2020

 1—Control (100% chemical NPK)

1.55 g

1.61f.

1.58E

40.67b

41.87a

41.27A

 2—75% chemical NPK + 25% natural sources

1.62ef

1.64e

1.63D

39.36 cd

39.76c

39.56B

 3—50% chemical NPK + 50% natural sources

1.68d

1.71d

1.70C

38.31e

38.92d

38.62C

 4—25% chemical NPK + 75% natural sources

1.75c

1.78b

1.77B

37.27f.

37.70f.

37.49D

 100–100% natural sources

1.78b

1.82a

1.80A

36.30 h

36.77 g

36.54E

 Mean

1.68B

1.71A

 

38.38B

39.01A

 

Second season; 2021

 1—Control (100% chemical NPK)

1.61 g

1.64f.

1.62E

41.71b

42.72a

42.21A

 2—75% chemical NPK + 25% natural sources

1.70e

1.70e

1.70D

40.20d

40.91c

40.55B

 3—50% chemical NPK + 50% natural sources

1.73d

1.74 cd

1.74C

39.36e

39.78de

39.57C

 4—25% chemical NPK + 75% natural sources

1.76c

1.82b

1.79B

38.18f.

38.35f.

38.27D

 100–100% natural sources

1.82b

1.85a

1.84A

36.83 h

37.50 g

37.17E

 Mean

1.73B

1.75A

 

39.26B

39.85A

 
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