Skip to main content
. 2023 Sep 19;8(39):35845–35855. doi: 10.1021/acsomega.3c03483

Table 7. Chemical Properties of Experimental Soil with Critical Value and Extraction Methods.

properties value critical value methods used
soil pH (1:1.25, Soil:H2O) 5.41   glass electrode pH meter46
organic matter (%) 1.48   wet oxidation method47
calculated by Van Bemmelen factor 1.7348
N (%) 0.08 0.12 micro-Kjeldahl method49
available P (ppm) 11.20 10.00 molybdate blue ascorbic acid method50
exchangeable K (mequiv 100 g–1) 0.10 0.12 determined by a flame photometer
exchangeable Ca (mequiv 100 g–1) 2.48 2.00 atomic absorption spectrophotometer51
exchangeable Mg (mequiv 100 g–1) 0.29 0.50 extractable method52
available S (ppm) 17.29 10.00 turbidity method using BaCl253
available B (ppm) 0.13 0.20 monocalcium biphosphate method, determined by spectrophotometer following the azomethine H method46
available Zn (ppm) 0.90 0.60 AAS54
available Fe (ppm) 51.90 4.0 AAS54
available Mn (ppm) 12.13 1.0 AAS54
CEC (mequiv 100 g–1 soil) 5.7   sodium acetate saturation method55