Table 2 PIES and nutrient concentrations of pepper stem extract (mg/kg).

From: Monitoring of plant-induced electrical signal of pepper plants (Capsicum annuum L.) according to urea fertilizer application

 

Greenhouse

Field

Low fertilizer (N0)

Control (N1)

High fertilizer (N2)

Low fertilizer (N0)

Control (N1)

High fertilizer (N1.5)

PIES (mS/m)

8.02 ± 2.01 b

9.63 ± 1.56 b

14.10 ± 2.65 a

12.83 ± 2.02 a

16.68 ± 3.29 a

13.71 ± 2.27 a

Ca

73.29 ± 15.21 a

72.85 ± 4.59 a

59.60 ± 7.54 a

41.94 ± 2.46 a

38.52 ± 3.56 a

35.69 ± 1.41 a

K

522.1 ± 10.6 ab

582.7 ± 14.3 a

423.2 ± 93.6 b

474.8 ± 46.8 a

618.8 ± 19.6 a

646.8 ± 211.5 a

Mg

45.54 ± 7.72 a

43.25 ± 4.27 ab

33.75 ± 1.46 b

44.38 ± 1.85 a

39.07 ± 3.88 a

44.48 ± 3.84 a

P

22.93 ± 1.47 a

7.00 ± 1.41 b

4.87 ± 4.96 b

7.60 ± 5.76 a

6.00 ± 4.83 a

9.96 ± 3.02 a

S

116.7 ± 15.4 a

78.71 ± 3.57 b

55.31 ± 9.44 c

14.52 ± 2.50 a

16.83 ± 1.77 a

15.60 ± 3.47 a

NH4+-N

8.96 ± 1.59 a

6.86 ± 1.22 a

6.84 ± 0.72 a

4.22 ± 0.47 a

7.65 ± 4.00 a

5.27 ± 1.63 a

NO3–N

–

–

–

0.09 ± 0.00 a

0.09 ± 0.03 a

0.08 ± 0.01 a

Stem extract EC (µS/cm)

210.0 ± 25.4 a

271.4 ± 48.9 a

226.1 ± 61.8 a

224.3 ± 35.9 a

270.7 ± 9.3 a

292.6 ± 67.3 a

  1. Significant differences among different treatment groups were marked with different letters (p < 0.05).
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