WATER IMBIBING TABLET, BRIQUETTE AND CAPSULE CONTAINING GROWTH ENHANCING MEDIAS AND WATER RETENTIVE COPOLYMERS USED IN FORESTRY OR AGRICULTURE

CAPSULE BRIQUETTE OU COMPRIME ABSORBANTS CONTENANT UN AGENT DE CROISSANCE ET DES COPOLYMERES HYDROPHILES UTILISES EN FORESTERIE ET AGRICULTURE

English Abstract

WATER IMBIBING TABLET OR CAPSULE
CONTAINING GROWTH ENHANCING
MEDIAS AND WATER-RETENTIVE
COPOLYMERS USED FOR DIRECT PLANTING
ABSTRACT
A tableted plant or seed growth media which incor-
porates various forestry or agricultural fertilizers,
minerals and nutrients for enhanced growth. Also
present are various water-retentive polymers such
as cross-linked polyacrylamide, hydroxypropyl
methylcellulose and microcrystalline cellulose.

Claims

THE EMBODIMENTS OF THE INVENTION IN
WHICH AN EXCLUSIVE PROPERTY OR PRIVILEGE
IS CLAIMED ARE DEFINED AS FOLLOWS:
(1) A plant growth enhancement tablet weighing at
least one-half gram, for slowly feeding plants over a
period of one year, comprising:
a tableted intimate mixture of solid particles
of the following ingredients:
a combination of plant enhancement agents
that are variable water soluble and are to a
large extent capable of being broken down
into water-soluble substances by the con-
tinued action of soil bacteria, talc and mag-
nesium stearate in the amount of 3% to 6%
by weight of the tablet as a tableting
lubricant which does not interfere with water
penetration and disintegration of the tablet,
a combination of various water-retentive
polymers that are slowly biodegradable over
five years by soil bacteria, and said com-
position consisting the major ingredients of
said tablet, and
Wereby said tablet on contact with rainfall or mois-
ture, starts to slowly hydrate and form a controlled
release gel capsule containing the plant enhancing
agents.
(2)The tablet of claim 1 whereby the seed enhance-
ment agents include various water-soluble fertilizers
such as mono/diammonium phosphate, caustic
potash and KNO3. In various concentrations ranging
from 5 to 40% by weight of the tablet.
(3)The tablet of claim 1, whereby the enhancement
agents is a member selected from the group consist-
ing of copper sulfate, thiram, captan, benomyl,
metalaxyl, carbofuran, acephate, malathion,
pronamide and ethyl dipropyl thiocarbanate.
(4)The tablet of claim 1, whereby the enhancement
agents is a member selected from the group consist-
ing of sugars, carbohydrates, adenosine triphos-
phate, calcium, magnesium, amino acids and
micronutrients.
(5) The tablet of claim 1, whereby the enhancement
agents is a member selected from the group consist-
ing of Pseudomonas species, Bacillus thuringleusis,
Mycomhizal fungi, Rhizobia species, Bacillus sub-
tilise and Actinomycete species.

? he tablet of claim 1 whereby the enhancement
agents is a member selected from the group consist-
ing of giberellic acid, cytokinins, naphthalene acetic <IMG>
acid, indolebutyric acid and indole acetic acid.
(7) The tablet of claim 1, whereby the enhancement
agents is a member selected from the group consist-
ing of denitrification inhibitors, iron chelators,
pheromones, enzymes, pesticide antidotes and which is present in concentrations of 3.50 to 5.0%
safeners. by weight of the tablet.
(8) The tablet of claim 1, whereby the enhancement (14) The tablet of claim 1 whereby the enhancement
agents is a member selected from the group consist- agents are micronutrients of agricuiturally modified
ing of soil and water conditioners, dispersants, wet- minerals veriniculate or perlite in concentrations
ting agents and pH altering compounds. ranging from 1 to 3% by weight of the tablet.
(9) The tablet of claim 1, that incorporates various (15) A plant growth enhancement tablet weighing at
enhancement agents listed in claims 2,3,4,5,6,7, least one-half gram for slowly feeding plants over a
and 8; in various concentrations ranging from period of one year,comprising;
0.002% to 99.4% of total additive content. ? a tableted intimate mixture of solid particles
of the following ingredients:
(10) The tablet of claim 9 wherein the tablets water-
retentive polymers are from the family of chemicals ? a combination of water-soluble and non-
whose basic structure is: soluble fertilizers such as nomo/diam-
monium phosphate potash, KNO3 and
P2O5 in various percentages from 5% to
20%.
? talc and magnesium stearate as the tablet-
<IMG> ing lubricant in concentrations of 3% to 6%.
? a combination of two water retentive
polymers from claim 3 and4 constituting the
major ingredient of said tablet, ranging in
concentrations from 5% to 85% by weight of
which is present at a concentration of 20.50 to 85.0% the tablet,
by weight of the tablet.
? as anti-browsing deterrent from claim 6 that
(11) The tablet of claim 9 wherein the tablet water- is present in concentrations of 0.50 to 5.0%
retentive polymers are from the family of cross- by weight of the tablet; added to deter
linked polyacrylamide copolymers; basic organic animal consumption of the enveloped seed,
chemicals synthetically produced and very slowly
biodegraded.
? various micronutrients that are derived from
modified agricultural minerals such as in
(12) The tablet of claim 2, wherein the tablet water- claim 9, are present in trace amounts from
retentive polymer complex is made up of composi- 0.002% to 99.4% of total additive content.
tion that included both chemicals listed in claim 3 and
4; which are present in various concentrations rang- Whereby said tablet on contact with rainfall or mois-
ing from 5.0 to 85.0% by weight of the tablet. ture starts to slowly hydrate and form a controlled
release gel capsule.
(16) The tablets mentioned in claims 1 through 8,
whereby the inert tablet binders, disintegrants,
(13)The tablet of claim 1 with the addition of various lubricants, and diluents do not react with any of the
non-toxic chemicals that deter animal and birds from tablet nutrients, fertilizers, polymers or seed physiol-
ingesting the nutrient gel;the ant-browsing complex ogy.
has the structure:

? The tablets mentioned in claims 1,2,6,7, and 8, a combination of water-retentive polymers
with inert tablet binders, disintegrants, lubricants and that are slowly biodegradable, and are able
diluents;wherein the tablet water-retentive polymers to absorb, hold and release over time, up to
are from those listed in table 1 excluding these 400 times their weight in water,
polymers in claims 3,4,and 5.
whereby said structure, upon planting either by
(18) The tablets mentioned in claim 1, wherein the ground or aerial means, starts to hydrate upon rain-
tablet gel polymers are from table 1, and the seed fall or moisture contact and forms a gelled capsule.
enhancement additives are from table 2 herein
before mentioned, in various concentrations ranging
from 0.01% to 85.0% by total weight of the tablet.
(22) The encapsulation structure of claim 21
whereby the structure includes pellets, capsules,
(19) A method of replanting of seeding areas that tablets, caplets, briquets in various circular, rectan-
otherwise would be to costly, labour intensive or gular, triangular, square shapes in both short and
inaccessible; comprising using an intimate mixture elongated forms, the structures may be completely
of water-retentive polymers, soil enhancement addi- solid, contain one hole, or contain many holes.
tives and in a tablet form: Whereas the tablet in dry
form is an intimate mixture of dry solid particles, that (23) The encapsulation structure of claim 21
are transformed into a cross-linked gel mass encap- whereby the structure is made of anywhere from 2
sulating and solubilizing the fertilize, nutrients and to 100 different components, all required to be inter-
other soil additives present. linked to achieve one functional encapsulation
media, that achieves all those claims stated in claims
1 to 20.
(20) A method of promoting seed growwth in green-
houses; comprising placing a bow expansion gel
tablet, directly into styrofoam containers soil, the (24) The encapsulation structure of claim 21
tablets comprising; an intimate mixture of solid par- whereby the enhancement agents include various
ticles of a water retentive polymer having low expan- water-soluble fertilizers such as mono/diammonium
sion rates, that is very slowly water soluble and to a phosphate, caustic potash and KNO3. In various
large extent capable of being broken down into water concentrations ranging from 5 to 20% by weight of
soluble substances by the continued action of soil the tablet.
bacteria, said polymer composition consisting the
major ingredient of said tablet, tab in the amount of (25) The encapsulation structure of claim 21,
2% to 5% by weight as a tableting lubricant which whereby the enhancement agents as a member
does not interfere with water penetration and disin- selected from the group consisting of copper sulfate,
tegration of the tablet, a combination of various thiram, captan, benomyl, metalaxyl, carbofuran,
fertilizers and soil enhancement additives. acephate, malathion, pronamide and ethyl dipropyl
thiocarbanate.
(21) An intimate mixture of dry solid particles weigh-
ing anywhere from 0.05 grams to 50 grams in weight; (26) The encapsulation structure of claim 21,
compressed into a variety of shapes, comprised of whereby the enhancement agents is a member
one or more parts that connect or fit together, and selected from the group consisting of sugars, car-
contain the following ingredients: bohydrates, adenosine triphosphate, calcium, mag-
nesium, amino acids and micronutrients.
a combination of plant enhancement agents
that are variable water soluble and are to a
large extent capable of being broken down (27) The encapsulation structure of claim 21,
into water-soluble substances by the con- whereby the enhancement agents is a member
tinued action of soil bacteria, selected from the group consisting of Pseudomonas
species, Bacillus thuringieusis, Mycorrhizal fungi,
a combination of various binders, disin- Rhizobia species, Bacillus subtilise and Ac-
tegrants, lubricants and diluents that do not tinomycete species.
react with the nutrients, fertilizers and
polymers contained within the encapsula-
tion structure,

(? The encapsulation structure of claim 21,
whereby the enhancement agents is a member
selected from the group consisting of giberellic acid,
cytokinins, naphthalene acetic acid, indolebutyric
acid and indole acetic acid.
(29) The encapsulation structure of claim 21,
whereby the enhancement agents is a member
selected from the group consisting of dentrification
inhibitors, iron chelators, pheromones, enzymes,
pesticide antidotes and safeners.
(30) The encapsulation structure of claim 21,
whereby the enhancement agents is a member
selected from the group consisting of soil and water
conditioners, dispersants, wetting agents and pH
altering compounds.
(31) The encapsulation structure of claim 21, that
incorporates various enhancement agents listed in
claims 2,3,4,5,6,7, and 8; in various concentrations
ranging from 0.002% to 99.4% of total additive con-
tent.
(32) The encapsulation structure of claim 21,
wherein the water-retentive polymers are those
listed in table 1 in various concentrations 0.05% to
85.0% of total encapsulation structure weight.
\e-cap.1

Description

F1ELl) Of THE INVENr70N
This invention relates to new compositions of matter
in a tablet form useful for encapsulatlng fertilkers
and water-ret0ntive polymers into one location. The
Inventlon also relates to a method ot utllizing these
plant growth ingredients by the seedling.
DESC~JPJtON OF THEPRlOF~AFrr
The use of gelling agents for seed is known. The
Dannelly Clarence C. US Pat. No 4249343 discloses
various compositions of a water~insoluble but water-
sensitive polymeric microgel. This gel when used for
seeds provides protection ~orthe seeds and may be
used to carry various materials such as fertilkers
and pesticides. However the polymer used does not
dissolve when contacted with water. The bindlng
forces at the interface between the particles of the
coating having a greater sensitivity to water than the
binding forces which malrltain tha particles intact.
Whereby contact with water destroys the continuity
of the coating causing itto disintesrate. Any carried
materials rnust be incorporated into the gel and seed
at the same time. Also thera is no available d~s-
solved material once the seed is planted due to the
gel nfalling~ off upon water contact. Basically the
polymer absorbs the acUve nutrients but does not
release them to promote controlled release over
time. Onca planted the seed nutrients carried in the
gel are leached away after the first rainfall.
In the present inventbn the leach resistant proper-
ties of the tablet combined with th~ direct compres-
sion of the dry mixture produce advantages in both
product~on anr~ controlled release of the tablet fer-
tilizer and micronutrlents.
:~;

~;~n
OI~JJEC~; Of 7HE INYE~JJION
It is an object of this invention to obtain a tableted
6 composition incorporation various agricultural
seeds, ferti1izers, micronutrlants and water-retentlve
polymers in a non-leaching, controlled-rel~ase pack- j
age.
10 It is a further obj~ct to produce a seed or plant growth
media from the mixture of cross-linked
polyacrylamides and hydroxypropylmethyi-cel-
luloses that can be readily added into tha tablet
matrix by dry mixing before compression.
It is a further object to obtain a seed or plant growth
media from the polymer complex that will retain
water, dissolve the encapsulated nutrients and ~er-
tilizers and sustain controlled release over time.
These and other objects of the invention will become
apparent from the description of this invention
hereinafter.
)5
- DESC~IIPTION OF~HEPREFERRED
EMBODlMENrS
The tablet, upon water addition, is formed into a body
of elastomeric cross-linked polymer that binds a
30 certain quantity of water, resuiting in a cohesive
gelled mass. The amount of bounci water can range
from 300-400% by weiçiht ot the polyacrylamide
copolymer/hydroxypropylmethylcellulose complex.
35 One advantage of this tablet is the ability to give up
the mapr portion of its water to seed or plant ger-
m~nation, tl~ereby aiding and abetting their growth.
Addltionally, the polymer gel contains plant growth
additives such as agricuitural mod-died minerals, buf-
~0 lers and fertilkers. These will be taken up slowly ina controlled release fashion with minimum dump-
~ng~. Fertillzers operable herein can be water in-
soluble, producin~ a longer release curve, or
soluble such as ammonium and dlammonium phos-
~5 phate, KN03, K2S, P20 and potash. The preferredpolymer to forrn the tablet is a synthetic organic
materiai such as cross-llnkec polyacrylamide or
hydroxypropylmethyl-cellulose, however, other
polymers can also be used (below). Upon reactlon
;O with water, these polymers provide a gel body that
extends around the root zone where it i8 plac0d.
Such a gel structure securely holds ths seed
nutrients and tertillzers, while providlng a res0rvoir
or water to feed the ~rowing seed, and eliminating
the rnalority oS leaching normally presant.
i

Z~ln~fi4n
Ethyl succlnylat~d cellulose
~ESTMOOEFOH CA~qYlNG our ~HE Succinylated Zeln
a~NnOH Carboxyme~hylcellulose
EN~LA7~0NMEDI,4 GELS 5 (B) HYDROPHOBIC INTERACTIONS
Methylcellubse
The seed containing lablet can be encapsulated Hydroxyethylcellulose
upon rr~istute or rainlall contact with any ot Hydroxypropylmethylcellubse
numerous media whkh provide an approprlate en-
capsulation ma1rix herea~1er termed ~gel~. In 10 ~C)COVALENTBONDS
general upon hydration a gel should albw embryo Gelath wlth glutaraldehyde
resp~ratbn by permitting dmusion o1 gases. The gel 111 SYNTHETIC POLYMERS
should also be strong enough to reslst extemal ( )
abrasbn anci adverse forces yet be pliable enough ~A) COVALENT BONDS
to aliow the growth of the embryo and its germination 15 PoiyacrylamWe
at the appropriate tirne. It rnay be desirable to use
varbus gels in combinatbn either as a mixture or in (B) HYDROPHOBIC INTERACTIONS
layers to achieve the desired resuits. The gel Poiyethylene glycol
selected must be able to retain and hoid a consWer- Hydrophilic urethane
able amourd of ~Iree water~ wh~ch ~s able to par- 20 Polyvinylpyrrolidone
tbipate In the physioiogical process o~ germ~natbn. Polyvlnylacetate
Some ol the suaable gels inciude but are not limaed Polyoxyethylene
to: Vinyl resins
TABLE 1: GEL AGENTS Hydron
l.NATURAL POLYMERS 25 2-methyl-5-vinylpyridinemethyl-acid
A.IONIC BONDS (C) IONIC BONDS
(REQUIRES COMPLEXING AGENTS) Sodium poly (styrene suHonate)+ poiy
(vinyl methyl pyrKiinium)CI
Abfnate with polypectate 30 Sociium poly (styrene suHonate)~
Sodium pectade poiy (vinyl benzyl trimethyl ammonium)CI
hrcellaran V~nyl acetate homopolymer
Dextran (Bordon poiy Co)
Gvar Gum Poiyvinyl aicohol resin (Gelvatoi-)
Sodium ablnate with çielatln 35
B.HYDROPHOBIC INTERACTIONS
Amybse Geiatln SELEC~WaP~MUMGELS
Gum Ghanl Agat Starch
Agarose Amylopectin 40 Any gel to be used in the dty lablet matrix wouid
Tl Gum Agarwith Gelatin usually include the 101iowin~ character~stics upon
Comhull Gum Wheat Gum hydratbn with moisture:
Chitln Dextrin
Starch Arabogalacta~n (1) An outer surlace to proviae a protecnve barrierto
mechanbal stress facilitate handOng and ma~nta~n
piant v~abllitY
(2) Once hydrated lhe interbr matenal would have
soiubility or emulsion 10rming characteristbs such
that it can accept or contain aWitives.
(Il) CHEMICALLY MODIFIED NATURAL
POLYMERS
(A) IONIC BONDS
(REQUIRES A COMPLEXING AGENT)
.
~. ,

~t~
Sugars
SELECTK~NOFAOOmVES ATP
Carbohydrates
It has been recognized that plant establishment
growth, and devehpment may be enhanced by ad- 5 (IV) MICROORGANISMS
ditbn of additives to the soil, to the rhizosphere of Pseudomonas species
the plant, and 1O the surface of the plant. It has been Rhizobia species
dernonstrated that controlled release o~ the additives Bacillus thuringiensis
may provide enhancement to plant growth. Bacillus subtilis
' Mycomhizal ~ungi
In the present invention additives which have been Actinomycete species
lound to be useful by adding to the tablet matrix
abng wah the ungerminated seeds, include pes- (V) GROWTH REGULATORS AND HORMONES
ticides, fertilizers, energy sources, growth Giberellic acid
promoters, growth regulators, safeners, and micro- '5 Naphthalene acet-lc acid
organisrns. Cytokinins
Indole acetic acid
TABLE 2 ADDITIVES TO TABLET UATRIX
~I) PESTICIDES (Vl) OTHER eloLoGlcALLy ACTIVE COM-
(A~ FUNGICIDES 20 POUNDS
Copper suifate Denitrification inhibitors
Thiram iron cheiators
Metalaxyl Pesticide anthiotes
Captan 25 Pheromones
(B) INSECTICIDES (Vll) OTHER INERT COMPOUNDS
Carbofuran Soil and water conditbners
Malathbn Wetting agenls
Acephate 30 Dispersants
(C) HERBICIDES pH aitering cornpounds
E1hyi dlpropylthbcarbamate These additives are added into the dry powder
matrix, and therefore rnust be in a powder or crystal
(Il) FERTILIZERS AND NUTRIENTS 35 toml to be used. Liquid additives cannot oe used in
Nitrogen Caicium thls invention. Spec,itic additives can be added to
Phosphonus Magnesium the tablet rrlixture at concentrations specific lor the
Potassium Amino acids applicatbn rates ol the particular additive. Pes-
Suifur Mbronutrients ticWes, lor example, can be added to the poiymer dry
mix ~n concentrations up to 99.4% ol the total tablet
additive content. More usually, pesticide concentra-
tions will be Irom 0.002 to 0.30 grams active in-
gredient per gram. Fertilizers, lor example, can be
added at a concentration ol 0.01 to 1.0 gram per 1.5
gram seed tablet. Micro-organisms, lor example,
(III)ENERGYSOURCES can be added at a concentration ol 1x10 to 12
micro-organisms per gram.

Into a tablet from, can be dlrectly or aerlally dls-
SUMUA~YOf rHElNYEN170N persed; resultlnçi in enhanced plant survlvabilRy.
Alabletedplantgrowthmedlathatcontains speci~ic Varlous testing wlth thls compound In a 1987-88
agricultural or lorestry applbatlon fertilizers, mbro- 5 study in South Florida on the survival and growth
nutrients and a water-retentive polymer complexes. effects on Ligustnum and Hibiscus transplants, was
Upon the applbation of an aqueous medium, a gei conducted wUh seed plantings made throughout the
cornposRbn ~s oblained. This m~xture ~orms a gel o~ year, In both wet and dry seasons. Resuits showed
water,containingthewatersolubleferUlkers,heldin that the survlval rate of all three species was Im-
a homogenous network o~ swollen, hydroph~llic, 10 proved when the above polymer was used, when
cross-linkedpolyacrylamWe/hydroxyprophy-methyl- compared to controls. In addition, the average
cellulose,complexes. Eventually, the water ~s siowly growth rate was also gr~ater due partly to the fact
released in a controlled fashion, leaving a thatthesoilconditlonsaroundthegelwasnoticeab-
polyacrylamide mass that can be rehydrated com- Iy softer to the touch than the untreated soils.
pletely in less than an hour. The rate of water 15
release during dry periods is slow enough to Another study in Western Massachusetts, at the
eliminate the risk o~ root rot. University of Massachusett s research nursery,
again tried to determine survival anci condRion ef-
The above mentioned fertilkers and water-retentive fects on various forestry tree species. The foilow~ng
polymers, when dry mixed wlth the proper b~nders, 20 seeds were used:
lubricants, disintegrants and compressed into a Eastem whRe pine (Pinus strobus)
tablet form, can be eRher apiolied direclly into the White spnuce (Picea alba)
ground using vafious plantin~ machinery or spread Cobrado blue spnuce (P. pungus)
by varbus aerial applbation methods. This albws Eastem hemhck (Tsuga canadensis)
the controlled fenilking of areas that would other- 25 Red spirea (pirea foobelli)
wise be unattainable. Yelhw targ dogwood (Cornus lutea)
DET~JLEDDESCRlf~lO~ HE Resultsshowedthatveryfewplantswereiostinboth
fflEfE1:1FltuEMBODll~N7~ test and control treatments. However, the gel-
30 treated seedlings were consistentiy rated h~gher in
A method ot Increasin~ seed survivabilRy, the main condithn.
obJect of the present inventbn, Involves the applica-
tbn of a leach-resistant tablet that slowly releases THE FOLLOWING EXAMPLES SHOW WHAT
water, fenillzers and mbronutrients in a controlled CAN BE DONE:
1ashlon. The tablet can be appaed wRh seeding 35 XA PLE 1
machlnery or by aerial dlspersal. Another object is E M
to provide a tablet which is totaliy bhdegradable
non-phytotoxic and contains ingredients that A water-retentive, fenilizer containlng, seed growth
promote plant growth. According lo one aspect, the enhancement tablet of this tablet is made from the
Inventbn cons~sts of the fam~ly of compounds such 40 folbwing components:
as the tollowlng: % BY WEIGHT
COMPOUND A 10.0
CROSS-LINKED
POLYACRYLAMIDE COPOLYMER 40.0
H oP~ 45 CARNAU8A WAX 10.0
MONO-AMMONIUM PHOSPHATE 5.0
~ ~ ~ ~ ~ POTASH 1 Qo
_ /C ~R H \~ / / \ 1~ MELOGEL STARCH 20.0
MAGNESIUM STEARATE 2.0
\ / / \ oQ ~ l TALC 3.0
~ ~ ~¦--Y 50 TOTAL100.0
_ C ~ R ~ ,~ This composiUon is thoroughly mixed dry and then
Which when dry mixed with the proper tertiliz~ rs, pelleteddryintotablets,whichmaybefrom1/2gram
micronulr.s;nts, binders, lubricants and compressed to 5.0 grams in ske. The tak and magnesium
, ~ stearate act as tablet lubricants durlng manufacture,
~or P~o n

Iring release from the tabletlng cavHy without
actlng to water proof the tablet.
The above forrnula is a scientiticaliy balanced iow-
toxhity seed supplement with bng~lastîng water- ¦
retentive characteustbs, whlch meet thq prablems
o~ drought, nutrient depletion, leaching and fqrtilker
dumpîng. The laner is accompnshed through a con-
trolled release of the soluble fertllizer to the seed
environment, by the cross-llnked
polyacrylamide!hydroxypropylmethylcellubse com-
plex. The very nature d the tablet also decreases
leaching bss ot nutrients.
.
EXAMPLE 2
A tablet oriented specifhally for greenhous~ seed
growth that incorporates a much hbher concentra-
tbn of compound A. Since the maprity of nursery
stock is grown in styroSoam contaîners, the gelling
characteristics d the cross-lirlked polyacrylamide
copolymer wouid actually damage seed stock by
bbcking gas exchange. The compound A tablet
would ~orm a gel oniy covering the sunacs of the
tablet aself. There will be no swelling or increase in
gel mass by this tablet.
% BY WEIGHT
COMPOUND A 40.0
CARNAUi3A WAX 20.0
MONO-AMMONIUM PHOSPHATE s.o
POTASH 1 0.0
MELOGEL STARCH 20.0
MAGNESIUM STEARATE 2.0
TALC 3.0
TOTAL 1 00.0YO : ;~
This composition is also thoroughly mixed dry and
lhen pelleted dry înto tablets, whbh are from 1/2 to
5.0 grams in ske. Thls formula is a hw-toxici~y plant
tablet with bng-lasting water-retentive charac-
teristics that meets the probîems of seed nutrient
stress. ,
I
.. . .
~,