Research Article

Improving Lowland Rice (O. sativa L. cv. MR219) Plant Growth Variables, Nutrients Uptake, and Nutrients Recovery Using Crude Humic Substances

Table 1

Selected chemical properties of Typic Paleudults (Bekenu Series) soil before incubation and pot study.

PropertyCurrent studyStandard data range*
(0–36 cm)

4.414.6–4.9
Bulk density (g cm−3)1.16NA
TOC (%)1.430.57–2.51
Total N (%)0.080.04–0.17
Exchangeable (mg kg−1)21.02NA
Available (mg kg−1)7.01NA
Available P (mg kg−1)4.85NA

(Cmol (+) kg−1)
CEC 11.973.86–8.46
Exchangeable K+0.100.05–0.19
Exchangeable Ca2+0.25NA
Exchangeable Mg2+0.34NA
Exchangeable Na+0.22NA
Exchangeable Fe2+0.19NA
Exchangeable Cu2+TraceNA
Exchangeable Zn2+0.01NA
Exchangeable Mn2+0.02NA
Total titratable acidity0.86NA
Exchangeable H+0.64NA
Exchangeable Al3+0.22NA

NA: not available; *Paramanathan [34].