Plant Growth Biostimulants Based on Different Methods of Seaweed Extraction with Water

Table 1

Multielemental composition of raw algal biomass and extracts obtained by boiling and soaking in water.

Element	Baltic seaweeds (mg/kg d.m.); ()	EB; ()	ES; ()	Extract obtained by boiling (45 min, 60°C) Ulva reticulata	Extract obtained by boiling Ulva lactuca	Extract obtained by MAE 25°C	Extract obtained by MAE 40°C	Extract obtained by MAE 60°C
				[34]	[35]	[25]
	mg/L
Macroelements
Ca				158	—
K				175	0.980
Mg				108	9.28
Na				295	5.04
P				—	—
S				—	—
Microelements
B				—	—
Co				—	0.201
Cu				1.15	3.02
Fe				5.22	0.417
Mn				—	0.050
Mo				—	—
Ni				—	—
Si				—	—
Zn				1.25	1.02
Toxic metals
As				—	—
Cd		<LLD	<LLD	—	—	<LLD
Pb				—	—

<LLD: below limit of detection.