Effect of incorporating bone char with sulfur or humic acid on phosphorus availability and spinach growth in calcareous sandy soil
AbstractThis study investigated the effects of applying modified bone char by sulfur (MBC) with humic acid and co-applying bone char (BC) with sulfur (S) or humic acid (HA) on chemical properties, phosphorus (P) availability, and spinach growth in calcareous sandy soil. This pot experiment has twelve treatments: Control (CK), bone + S (BS), bone + HA (BHA), BC + S (BCS), BC + HA (BCHA), MBC, MBC + HA (MBCHA), acidified BC with 0.1 N H2SO4 (0.1ABC), acidified BC with 1 N H2SO4 (1ABC), rock phosphate (RP), RP + S (RPS), and RP + HA (RPHA). The B, BC, MBC, 0.1ABC, 1ABC, and RP were added at 300 mg P kg− 1 soil doses. Spinach was grown in this experiment. Applying all treatments significantly increased soil phosphorus availability. Available phosphorus increased from 11.61 mg kg− 1 (CK) to 19.70, 19.76, 21.82, 22.25, 22.45, 26.09, 19.58, 21.01, 15.26, 18.95, and 17.77 mg kg− 1 for BS, BHA, BCS, BCHA, MBC, MBCHA, 0.1ABC, 1ABC, RP, RPS, and RPHA, respectively. The effectiveness of the treatments in this study on the available phosphorus improvement was in the order of MBCHA > MBC > BCHA > BCS > 1ABC > BHA > BS > 0.1ABC > RPS > RPHA > RP > control. Compared to the control treatment, applying BHA, BCS, BCHA, MBC, MBCHA, 1ABC, RPS, and RPHA to the soil significantly increased the fresh shoot of the spinach plant. Fresh shoot of spinach increased from 46.02 g pot− 1 for CK to 54.41, 54.36, 56.94, 50.39, 51.91, 48.83, 54.24, and 49.52 g pot− 1 for BHA, BCS, BCHA, MBC, MBCHA, 1ABC, RPS, and RPHA, respectively. The effectiveness of treatments in improving the fresh weight of spinach was in the order of BCHA > BHA ≈ BCS > RPS > MBCHA > MBC > RPHA > 1ABC > control > RP > BS > 0.1ABC. Our results concluded that co-applying bone char with sulfur is optimal for enhancing soil quality indicators and improving fresh and dry shoots of spinach. Due to its cheaper price, it is preferable to add sulfur with bone char rather than humic acid.
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Data availability
The datasets used or analyzed during the current study are available from the corresponding author upon reasonable request.
Abbreviations0.1ABC:
Acidified BC with 0.1 N H2SO4
1ABC:
Aacidified BC with 1 N H2SO4
B:
Bone
BHA:
Bone + humic acid
BS:
Bone + sulfur
BC:
Bone char
BCHA:
Bone char + humic acid
BCS:
Bone char + sulfur
C:
Carbon
Ca:
Calcium
CaCO3
:
Calcium carbonate
CK:
Control
Cl:
Chloride
EC:
Electrical conductivity
H:
Hydrogen
H2O2
:
Hydrogen peroxide
H2SO4
:
Sulfuric Acid
ha:
Hectare
HA:
Humic acid
HCl:
Hydrochloric acid
HCO3
:
Bicarbonate
K:
Potassium
MBC:
Modified bone char
MBCHA:
Modified bone char + humic acid
Mg:
Magnesium
N:
Nitrogen
Na:
Sodium
NaOH:
Sodium hydroxide
O.M:
Organic matter
P:
Phosphorus
p:
Probability
RP:
Rock phosphate
RPHA:
Rock phosphate + humic acid
RPS:
Rock phosphate + sulfur
S:
Sulfur
SO4
:
Sulfate
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Abu El-Eyuoon Abu Zied Amin.Ethics declarations
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KeywordsBone charHumic acidModified bone charSpinachSulfurSustainable agriculture More
