Agriculture Reference
In-Depth Information
Table 2.3 Patents on inputs that fall into Category 3 (nanoscale coatings or hosts)
Nano-content
Claim
a
Patent title
Ref
Bentonite
Special fertilizer for soybean
Preparation method made
use of raw materials which
included nano-parts by
weight of bentonite. The
powder coating involved
grounding of raw materials
after burning into
nanopowder (no size infor-
mation given)
Liu
et al. (
2012a
)
Diatomite
Nano-diatomite and zeolite
ceramic crystal powder
A plant growth medium can
be prepared using diatomite
and zeolites that has been
ionized at high temperature
and loaded with ammonia
solution. Cross-listed to
Category 3 zeolites
Yu (
2005a
)
Halloysite
A method for treating agri-
cultural crops using mate-
rials associated with tubular
carriers
Halloysite and other
mineral-derived nanotubes
can be used in controlled-
release fertilizers for treating
crops. Could also be cross-
listed to Category 1
Price and
Wagner
(
2008
)
Hydroxyapatite
Phosphorus fertilizer com-
prising nano-hydroxyapatite
and its preparation process
The nano-hydroxyapatite
phosphorus fertilizer (grain
diameter 20-50 nm) is pre-
pared by precipitation or
hydrothermal reactions from
P and Ca base solutions.
Claims that this fertilizer
helps maintain soil P level,
reducing its loss to water
Wei
et al. (
2011
)
Compositions for sustained
release of agricultural mac-
ronutrients and process
thereof
A nitrogen-containing mac-
ronutrient is adsorbed onto
hydroxyapatite phosphate
nanoparticles and interca-
lated within a nanoclay. This
nanocomposite allows for
slow release of the macro-
nutrient upon contact with
acidic soil (cross-listed with
Category 3 layered double
hydroxides)
Kottegoda
et al. (
2011a
)
Cellulose-based sustained-
release macronutrient com-
position for fertilizer
application
A nitrogen-containing mac-
ronutrient is adsorbed onto
hydroxyapatite phosphate
nanoparticles and encapsu-
lated in wood cavities. The
wood is coated with
cellulose-modified
Kottegoda
et al. (
2011b
)
(continued)
