TITLE:
Utilization of Wood Biomass for Organic Soil Based on the Soil Fertility Index (SOFIX)
AUTHORS:
Pitchayapa Pholkaw, Ayaka Muraji, Kazuyoshi Maeda, Taiki Kawagoe, Kenzo Kubota, Sirilak Sanpa, Quoc Thinh Tran, Motoki Kubo
KEYWORDS:
Wood Biomass, Organic Soil, Soil Fertility Index (SOFIX)
JOURNAL NAME:
Journal of Agricultural Chemistry and Environment,
Vol.8 No.4,
November
29,
2019
ABSTRACT: Possibility of wood biomass for preparing organic soil was examined to
construct reproducible and stable organic standard soil. Seven organic soils
were constructed from base soils and additive materials based on the
recommended values of the soil fertility
index (SOFIX) (total carbon ≥ 25,000 mg/kg, total nitrogen ≥ 1500 mg/kg,
total phosphorus ≥ 1100, and total potassium of 2500 to 10,000 mg/kg). Base
soils were prepared from two types of wood biomass (big- and small-sized wood chips) at 50%, 60%, and 70% (v/v) and other organic materials such as
peat moss, black soil, and mountain soil. Additive materials (soybean meal, oil cake, cow manure, and bone meal) were amended into all
organic soils at the same amount. Incubation experiment showed that bacterial
biomass in all organic soil was greater than 6 × 108 cells/g-soil
after addition of 30% of water content for 1 week. In addition, polymerase
chain reaction denaturing gradient gel electrophoresis (PCR-DGGE) analysis resulted
in a stable bacterial diversity of the organic soil prepared from the small
size wood chip at 70%. Chemical properties of all organic soils were within the
recommended values of SOFIX. The plant cultivation experiment showed that fresh Brassica rapa var. peruviridis weights in the organic soils
with 50%, 60%, and 70% of small-sized
wood chip were 5%, 16%, and 27% higher than that
of the chemical fertilizer-amended soil. The organic soil with 70% of small
wood chip was the best in the seven organic soils in this study.