FIELD OF INVENTION:
The present invention relates to the field of Nutrient efficiency improvement. The present invention in particular relates to Ortho Silicic acid release along with the fertilizer which in turn improves the fertilizer efficiency for agriculture.
DESCRIPTION OF THE RELATED ART:
Silicon (Si) is important biogenic microelement which exhibits several roles in human, plant and animal organism. In plants, silicon exhibits the following effects [H. A. Cunie, C. C. Perry: Silica in Plants: Biological, Biochemical and Chemical Studies, Ann. Botany 100 (2007) 1383-1389]: (i) stimulates photosynthesis process and increases utility of nutrients what results in enhanced crop yields; (ii) improves water management and thus enhances resistance to stress conditions like drought; and (iii) enhances resistance to insect attacks and fungal diseases. Biologically available source of silicon is ortho-silicic acid (HL^SiO^. It is known to those skilled in the art that silicic acid, in its monomelic form, ortho-silicic acid (H4 Si04) is not stable, but at higher concentrations undergoes polymerization
yielding dimeric (H6Si207), trimeric (HgSisOio), as well as linear unbranched
>
oligomers (SI) which are all water soluble.
It is known from practice and literature that appropriately treated silicon compounds become compounds which are assimilated by plants. Silicic acid particles in colloidal solutions are characterized by a large surface, of approximately 300 m2 per 1 ml of solution. As active silanol Si-OH hydrophilic groups are observed on their surface, such molecules have a tendency to separate
from the water and clump together to form larger agglomerates, which reduces their
1*
water solubility and hinders their uptake by plants. The addition of organic compounds, such as polysaccharides, polyalcohols and amino acids, stabilises silicate solutions against undesired polymerisation, increasing their bioavailability. Methods have been* developed to provide silicic acid in various forms. Reference may be made to the following-

Patent No. US5433766 relates to a synthetic apatite containing agronutrients and a method for making the apatite are disclosed. The apatite comprises crystalline calcium phosphate having agro-nutrients dispersed in the crystalline structure. The agro-nutrients can comprise potassium, magnesium, sulfur, iron, manganese, molybdenum, chlorine, boron, copper and zinc in amounts suited for plant growth. The apatite can optionally comprise a carbonate and/or silicon solubility control agent. The agro-nutrients are released slowly as the apatite dissolves
Publication No. WO2018087318 relates to Calcium silicate powders are provided. The calcium silicate powders comprise porous calcium silicate particles and an additive, the additive being at least partially penetrated into the pores of the particles. The additive is present in an amount of between 1.5 and 50 %w, wherein %w is the weight ratio, expressed as percentage, of the dry weight of the additive over the dry weight of the combination of the calcium silicate particles and additive.
The article entitled "Effect of calcium silicate on yield and nitrogen use efficiency (nue) of wetland rice" talks about the effect of calcium silicate application on the growth, yield and nitrogen use efficiency (NUE) of wetland rice at eastern dry zone soils of Karnataka, using Cv. BI-34, a medium duration rice genotype. Results revealed that the significantly highest grain and straw yield was noticed with 100 kg N ha-1 (RDF) along with the application of calcium silicate @ 2t ha-1 over all other treatments. Application of calcium silicate @ 2t ha-1 along with LCC based N application of 75 kg N ha-1 (Basal 30 kg N ha-1 + LCC) recorded on par grain and straw yield over RDF alone. Higher nitrogen use efficiency i.e. AEN , REN , PEPN values were noticed with LCC based application along with calcium silicate @ 2 t/ha).
The article entitled "Slow-release potassium silicate fertilizer with the function of superabsorbent and water retention" talks about the utilization of fertilizer and water resource at the same time, a new slow-release potassium silicate fertilizer with the function of superabsorbent and water retention (SRPS) was prepared, which possessed the core/shell structure. Its core was potassium silicate in an alginate matrix, and the shell was poly(acrylic acid-co-acrylamide)/kaolin (P(AA-co-

AM)/kaolin) supenibsorbent polymer. The product contained 26.6% K20 and 10.4% Si02. The effects of the amount of acrylamide, crosslinking agent, initiator, degree of neutralization of acrylic acid (AA), and kaolin concentration on water absorbency were investigated and optimized. The water absorbency of the product was 85 times its own weight if it was allowed to swell in tap water at room temperature for 90 min. Release characteristics of potassium and silicon from SRPS in soil and water-retention capacity of the soil with SRPS were also investigated. A non-Fickian diffusion mechanism of nutrient release was proposed, and the release rate factor K, the release exponent n, and the diffusion coefficient D of nutrients in SRPS was calculated. This product with good slow-release and water-retention capacity, being nontoxic in soil and environmentally friendly, could be especially useful in agricultural and horticultural applications.
Publication No. US20-13130902 relates to dissolved silicate compositions in which the dissolved silicate is stabilized by at least two selected osmolytes and is therefore bioavailable. The composition and its dilutions are stable over a long period of time and are used in a wide field of applications for the benefit of living organisms such as plants, animals and humans.
Publication No, US2004069032 relates to amended granular fertilizer and a method for applying an amended granular fertilizer to soil wherein a soil stabilizer is intermixed, impregnated, and/or applied to the granular fertilizer. Fertilizer is selected from the group consisting of: carbon, hydrogen, oxygen, nitrogen, phosphorus, potassium, calcium, magnesium, sulfur, boron, chlorine, copper, iron, manganese, molybdenum, zinc, sodium silicon, cobalt, and vanadium, or any combination thereof.
Publication No. WO0158831 relates to a soil supplement contains amorphous silica which reacts with water to form a mono silicic acid which can be absorbed by plants. The supplement contains a much higher level of plant available silicon compared with conventional soil supplements. The supplement can be produced by reacting a metal silicate (for instance a crushed rock) with an acid (for instance sulphuric acid) in a substantially solid state reaction to promote acidolysis as opposed to hydrolysis.

The supplement can be further processed by reaction with an alkali (crushed limestone) in a substantially solid state reaction to provide a higher level of mono silicic acid in the supplement. The supplement promotes plant growth in sugar cane, rice, pasture and other plants that require mono silicic acid.
Thus there exists a need of a fertilizer is completely available to the Plant and without any leaching or loss.
Hence, present invention aims to provide Ortho Silicic acid fertilizer for agriculture. Because of ortho siliic cid is linked with Calcium Phosphate, the Phosphorus from this fertilizer is completely available to the plant and there is no leaching or loss.
OB JECTS OF THE INVENTION:
The principal object of the present invention is to provide Ortho Silicic acid fertilizer for agriculture.
Another object of the present invention is to provide a method for preparation of Ortho Silicic acid fertilizer for agriculture.
Yet another object of the present invention is to provide a fertilizer for agriculture having long shelf life.
SUMMARY OF THE INVENTION:
The present invention relates to Ortho Silicic acid fertilizer for agriculture. The fertilizer according to the present invention is prepared by -
(a) Phosphorus acid is added to Potassium Silicate solution and then Fulvic acid is added followed by addition of Amino acids. The reaction mass is heated and then cooled. The filtered mass is then Spin Hash Fried at the temperature of 100 -250°C for obtaining a Stabilized Powder OSA.

(b) Phosphoric acid is added to stabilized powder OSA and heated to 160°C. Heating is stopped and Calcium Hydroxide is charged. The material starts crystallizing along with OSA. The crystals are dried on a Conveyor belt. This Powder then is granulated and coated with Diatomacous earth and Calcium lignosulfonate.
The fertilizer, according to the present invention, is the only powder form of Ortho silicic acid complex which can be used in Insoluble fertilizer like Calcium Phosphate. The method of preparing powder OSA is as following: Prepare 20-30% Phosphoric acid in a reactor and heat to 30-50 C and add 5%- 15% Potassium Silicate and stir for 2-6 hours. Check the Particle size in UV Spectrophotometer and then add slowly Fulvic acid, amino acids and Lignosulfonate till the product reaches a pH of 3 -5. This Mixing of Ortho Silicic acid solution and Fulvic acid , amino acids and Lignosulfonate has to be done in a continuous static mixer at very high rpm 300 -3000 rpm to form a clear solution and the material has to be fed into a spray dryer continuously to form a dry powder .
Charge 75%- 95% Phosphoric acid in the reactor around 500- 1500 kg in a Slow anchor reactor. Add 50-150 kg of Pure OSA powder prepared from above step into the reactor and heat to 80-90 C. Then slowly add Calcium Hydroxide till the whole mass becomes a dry powder. Unload this powder into a Fluidised Bed dryer to bring the moisture below 1%. Take a Blender for solid mixing. Charge 500 kgs of the Calcium Phosphate which is having Ortho Silicic acid. Charge 100 Kg of Diatomaceous earth. Add Binders like Calcium Lignosulfonate and Potassium Humate and mix till it is able to supply to a granulator.
In an aspect, the Granules has the composition of Calcium 10- 30%, phosphorus penta oxide (P205)- 20-50 %, Silicon = 2-23 % and Carbon content of 1-10%. Because of ortho siliic cid is linked with Calcium Phosphate, the Phosphorus from this fertilizer is completely available to the plant and there is no leaching or loss.

Fulvic acid is one of the important ingredients in the soil which dissolves silica and does not allow the Product to GEL as it dissolves the Polymer as soon it is formed and keeps it in monomeric form. The OSA is CO- valently bonded and protected with amino acid and Fulvic acidand lignin salts at low PH in powder form because of which it is permanently stable at room temperature. The final product has P205, CaO, Si02. The product is chemically integrated with Long -chain bonds Si-O-P -Si -O- Ca which a cohesive matrix.
BREIF DESCRIPTION OF THE INVENTION:
It is to be noted, however, that the appended drawings illustrate only typical
embodiments of this invention and are therefore not to be considered for
limiting of its scope, for the invention may admit to other equally effective
embodiments.
Figure 1 shows Phosphorus content in different soil treatments after 30 days of
incubation; (A) shows Phosphorus content in leaf and (B) Available phosphorus
content in soil; Tl: control, T2: SSP, T3: OSA fertilizer, T4: SSP + OSA fertilizer;
Figure 2 shows comparative growth of wheat at tillering stage and grain filling stage;
Figure 3 shows an increase in the content of primary nutrients in flag leaves in OSA
fertilizer fortified FYM.
DETAILED DESCRIPTION OF THE INVENTION:
The present invention relates to Ortho Silicic acid fertilizer for agriculture. The fertilizer, according to the present invention, is the only powder form of Ortho silicic acid complex which can be used in Insouble fertilizer like Calcium Phosphate. The present innovation is aimed to optimize phosphorus nutrition to crops. The phosphorus content in plants is about 0.2% by weight, but has limited availability in soils. Interplay of soil factors such as soil pH> organic matter content, parent material, soil texture reduces the available phosphorus in soil. In acidic soils, phosphorus readily forms insoluble complexes with iron (Fe) and aluminum (Al), while in alkaline soils insoluble complexes are formed with calcium (Ca).

Soil amendments like liming (acidic soils), organic manures and acidic fertilizers (alkaline/calcareous soils) are practiced to improve the availability of phosphorus. Ortho silicic acid has a proven role in improving availability of phosphorus in all soil types.
The method of preparing powder OS A is as following:
Prepare 20-30% Phosphoric acid in a reactor and heat to 30-50°C and add 5%- 15% Potassium Silicate and stir for 2-6 hours. Check the Particle size in UV Spectrophotometer and then add slowly Fulvic acid, amino acids and Lignosulfonate till the product reaches a Ph of 3 -5. This Mixing of Ortho Silicic acid solution and Fulvic acid, aminbacids and Lignosulfonate has to be done in a continuous static mixer at very high rpm 300 -3000 rpm to form a clear solution and the material has to be fed into a spray dryer continuously to form a dry powder. Charge 75%- 95% Phosphoric acid in the reactor around 500- 1500 kgs in a Slow anchor reactor . Add 50-150 kgs of Pure OS A powder prepared from above step into the reactor and heat to 80-90 C. Then slowly add Calcium Hydroxide till the whole mass becomes a dry powder. Unload this powder into a Fluidised Bed dryer to bring the moisture below 1%. Take a Blender for solid mixing. Charge 500 kgs of the Calcium Phosphate which is having Ortho Silicic acid. Charge 100 Kgs of Diatomaceous earth. Add Binders like Calcium Lignosulfonate and Potassium Humate and mix till it is able to supply to a granulator.
t.. In an aspect, the Granules has the composition of Calcium 10- 30%, phosphorus
penta oxide (P205) 20-50 %, Silicon = 2-23 % and Carbon content of 1-10%.
Because of ortho siliic cid is linked with Calcium Phosphate, the Phosphorus from
this fertilizer is completely available to the plant and there is no leaching or loss.
Fulvic acid is one of the important ingredients in the soil which dissolves silica and
does not allow the Product to GEL as it dissolves the Polymer as soon it is formed
and keeps it in monomeric form. The OSA is CO- valently bonded and protected
with amino acid arid Fulvic acid and lignin salts at low PH in powder form because
of which it is permanently stable at room temperature.

The final product has P205, CaO, Si02. The product is chemically integrated with Long-chain bonds Si-O-P-Si-O-Ca which a cohesive matrix.
A series of experiments are conducted to ascertain the beneficial impact of OSA fertilizer over the conventional soil amendments for reclaiming the problematic soils.
Experiment 1; Impact of Ortho Silicic Acid (OSA) amendment in improving the P status in plants
A pot study was conducted to ascertain the impact of OSA on P nutrition in plants. Seeds of cucumber were planted in pot (2 kg soil) with different treatments viz. Tl: control, T2: SSP (10g/pot), T3: OSA powder (50 mg/pot), T4: SSP (lOg/pot) + OSA powder (50 mg/pot), in three replications. Pots were watered as per requirement. Pots were randomized and incubated under ambient conditions in shade net. Growth parameters and nutrient profiling of leaves were done as per standard protocols periodically. Application of phosphorus fertilizer improved the growth of cucumber significantly compared to control (no fertilizer), at all-time points. OSA when added without P fertilizer had a profound impact on improving the vegetative growth of plants with all parameters had higher numerical values compared to control. Among various treatments, P source and OSA fertilizer when applied in combination had recorded the highest numerical values for all parameters (Table 1). Table 1: Impact of different treatments on growth of plants

Treatments Plant height (cm) Leaf area (sq cm) Root length (cm)
30 days 60 days 30 days 60 days 30 days 60 days
Control 14.2 c 31.5 d 34.5c 56.7d 20.2c 46.7d
SSP 27.8 b 63.2 b 41.3 b 67.7b 34.5 b 63.9b
OSA fertilizer 23.6 b 58.1c 38.7 be 60.2 c 31.4b 56.4 c
SSP + OSA fertili zer 38.5 a 75.4 a 52.3 a 78.3 a 45.7 a 72.6 a
Means with the same letter are not significantly different from each other, p<0.05
Nutrient profiling of leaves collected from different treatments indicated highest phosphorus content of leaves in treatment where OSA was present along with phosphorus source..

Similar to the leaf P content, the available P in soil was also recorded maximum in the same treatment. OSA, when added in absence of external P source also improved both the P content in leaf as well as available P in soil (Figure 1), indicating that a role of OSA in improving the availability of phosphorus locked in soil.
Experiment 2: Comparison of OSA fertilizer and lime on the phosphorus nutrition and yields of mango under acidic soils.
Field study was conducted on mangoes var. "Alphonso", grown on lateritic soils (pH 5.12). Recommended dose of fertilizer (3 kg Urea, 3 kg single super phosphate, 1 kg sulphate of potash, 10 kg F.Y.M) were applied in three splits. Impact of various soil amendments (lime, calcium silicate and OSA fertilizer) was studied on the leaf nutrition as well as availability of soil nutrients at various phenological stages. Lime was used @ 2 kg/tree, calcium silicate @ 2 kg/tree; OSA fertilizer were used @ 250g/tree.
The acidic soils usually have low availability of macro nutrients (Phosphorus, Calcium, Magnesium) along with few micronutrients. Liming is the traditional and most popular approach to ameliorate soil acidity. Applications of various soil amendments improved the availability of nutrients in soil, which in turn improved the nutritional status of leaves. Nutritional status of leaves at marble stage of fruit development improved substantially following various soil amendments (Table 2). Higher numerical values for various nutrients in leaves were recorded in liming treatment but OSA fertilizer had also exhibited a profound impact in improving the nutrient profile of leaves at much lower dose.
Table 2: Nutrient profile of mango leaves at marble stage of fruit.
Treatment P (g/kg) K (g/kg) Ca (g/kg)
Lime 3.59 17.84 7.93
OSA Granules 2.97 15.42 6.57
Calcium silicate 2.34 13.21 5.64

Experiment 3: Impact of OS A granules on yield of wheat on calcareous soil. Study was conducted in farmers field having a calcareous soil (pH 7.6, CaCO3 25.4% with low available P. Soil was amended with FYM @ 7.5 t/ha and FYM@ 7.5t/ha along with OSA fertilizer @ 20 kg/ha. Recommended dose of fertilizer was applied in three splits (basal, CRI stage and flag leaf stage). Crop was irrigated as per the farmers practice. Productivity in calcareous soils is limited due to overall low availability of nutr|ents. Availability of phosphorus is very low due to formation of insoluble complexes with calcium. Higher doses of organic manures are recommended to ensure the optimum yields in such soils. In the present study FYM was used as control and OSA fertilizers @ 20kg/ha were added along with FYM as the treatment. Vegetative growth of crop improved markedly where OSA fertilizer was applied along with FYM (Figure 2) and was also indicated by better nutritional status of leaves (Figure 3). Application of OSA fertilizer resulted in a yield increment of 25% over control.
The above experiments clearly demonstrate that OSA fertilizer is beneficial for improving productivity in all types of soils. This is attributed due to its role in releasing the adsorbed nutrients from soils. All ingredients used in OSA fertilizer are natural and have a proven role in rejuvenation of soil for sustainable agriculture. Prolong use of OSA fertilizer has no deleterious impact on soil.
Numerous modifications and adaptations of the system of the present invention will be apparent to those skilled in the art, and thus it is intended by the appended claims to cover all such modifications and adaptations which fall within the true spirit and scope of this invention.

WE CLAIM:
1. Ortho Silicic acid fertilizer for agriculture comprising Calcium 10- 30%,
phosphorus penta oxide (P205) 20-50%, Silicon = 2-23% and Carbon content of 1-
10%.
2. The Ortho Silicic acid fertilizer for agriculture as claimed in claim 1 wherein the fertilizer is in the powder form of Ortho silicic acid complex to be used in insouble fertilizer like Calcium Phosphate.
3. A method for preparation of Ortho Silicic acid fertilizer comprising the steps of-

(a) adding Phosphorus acid to Potassium Silicate solution and then adding Fulvic acid followed by addition of Amino acids; heating the reaction mass and then cooling an filtering; drying the filtered mass at the temperature of 100 -250°C for obtaining a Stabilised Powder OSA;
(b) adding Phosphoric to stabilized powder OSA and heating to 160°C; stopping the heating and charging Calcium Hydroxide for crystallizing the material along with OSA; drying the crystals on a Conveyor belt to obtain powder which is then is granulated and coated with Diatomaceous earth and Calcium lignosulfonate.