ISSN 1070-4272, Russian Journal of Applied Chemistry, 2007, Vol. 80, No. 3, pp. 352!357. + Pleiades Publishing, Ltd., 2007.
Original Russian Text + R. Paleckiene, A. Sviklas, R. Šlinkšiene, 2007, published in Zhurnal Prikladnoi Khimii, 2007, Vol. 80, No. 3, pp. 353!359.
AND INDUSTRIAL INORGANIC CHEMISTRY
Physicochemical Properties of a Microelement Fertilizer
with Amino Acids
R. Paleckiene, A. Sviklas, and R. Šlinkšiene
Kaunas Technological University, Kaunas, Lithuania
Received June 19, 2006
Abstract-The physicochemical properties of the initial components and products were studied with the aim
of production of a microelement fertilizer with an amino acid concentrate. The physicochemical properties
of the amino acid concentrate and its influence on the stability and sorption properties of fertilizers enriched
in microelements were studied.
Intensification of agriculture requires using not
only effective mineral fertilizers containing macro-
and microelements [1, 2], but also physiologically
active substances, growth stimulants. In the past years,
much attention was given to testing as growth stimu-
lants various synthetic and natural physiologically
active substances: citric acid, humates, amino acids,
The use of amino acids is most often recommended
under critical conditions of plant growth: after trans-
plantation, in the flowering period, and also at climat-
ic stresses (night frosts, drought) or plant diseases.
Amino acids are particularly effective in fertilizers
when used in combination with microelements .
In this study we examined the physicochemical
properties of the amino acid concentrate (AAC) and
its effect on the stability and sorption properties of
fertilizers enriched in microelements.
As AAC we used Naturamin-WSP product
(DAYMSA, Spain), and as fertilizer, ARVI-micro
product (ARVI and Co., Lithuania) containing ammo-
nium sulfate and microelements.
The compositions of substances were determined
Fig. 1. Content of amino acids c
in Naturamin-WSP: (D) aspartic acid, (E) glutamic acid, (S) serine, (G) glycine, (H) histi-
dine, (R) arginine, (T) threonine, (A) alanine, (P) proline, (Y) tyrosine, (V) valine, (M) methionine, (I) isoleucine, (L) leucine,
(F) phenylalanine, (K) lysine, and (C) cysteine.
by chemical and physicochemical methods of anal-
ysis. The nitrogen concentration was determined by
standard methods [13, 14]. The solid substances were
examined by IR spectroscopy, thermal analysis, and
X-ray phase analysis . The IR spectra were re-
corded on a Spectrum GX FTIR spectrometer (Perkin3
Elmer); samples were prepared as KBr pellets. Ther-
mal analysis was performed by differential scanning
calorimetry (DSC) with a Du Pont Instruments 990
Thermal Analyzer at a heating rate of 10 deg min
X-ray phase analysis was performed with a DRON-6
diffractometer (Ni-filtered Cu radiation, range of
diffraction angles 0o3166.5o, relative error <0.5%).
Naturamin-WSP amino acid concentrate was pre-
pared by chemical hydrolysis of proteins, collagen,
and keratin. The chemical formula of the product de-
pends on the ratio of free amino acids and oligopep-
tides. Naturamin-WSP product is a concentrate of
water-soluble amino acids containing 80% free amino
acids and 12.8% nitrogen; the total weight fraction of
organic matter is 90%.
Naturamin-WSP concentrate is a homogeneous
mixture of microgranules; it contains 17 amino acids
in amounts shown in Fig. 1.