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Table 1 Characteristics of organic materials used in the experiment

From: Biochar and vermicompost improve growth and physiological traits of eggplant (Solanum melongena L.) under deficit irrigation

Chemical characteristics Unit Vermicompost Date palm biochar Pistachio biochar
pH-KCl 7.5 ± 0.0 9.0 ± 0.2 7.7 ± 0.1
EC dS/m 2.0 ± 0.3 7.5 ± 0.8 9.7 ± 0.8
Total nitrogen % 2.0 ± 0.1 0.7 ± 0.1 0.6 ± 0.3
SOC % 29.0 ± 1.1 72.0 ± 4.1 73.2 ± 2.5
Phosphorus g/kg 1.8 ± 0.2 1.5 ± 0.3 1.3 ± 0.1
Potassium g/kg 30.1 ± 2.5 8.3 ± 0.4 6.4 ± 0.5
Calcium g/kg 47.8 ± 3.7 5.9 ± 0.2 6.1 ± 0.7
Magnesium g/kg 10.8 ± 1.0 3.3 ± 0.2 3.8 ± 0.3
C:N 14.5 ± 1.6 102.8 ± 6.2 122.0 ± 8.5
  1. EC electrical conductivity, SOC soil organic carbon, C/N carbon-to-nitrogen ratio