Claims:What is claimed is:
1. A water soluble N-P-K fertilizer is prepared with a combination of urea and dibasic potassium phosphate K2HPO4.

2. A water soluble N-P-K fertilizer combination of claim 1 wherein Seaweed extract is added to offer microelements and trace elements to the product.

3. A concentrated N-P-K fertilizer combination of claim 1 wherein Spirulina is added to offer Amino acids to the product.

4. A concentrated N-P-K fertilizer combination of claim 1 wherein potassium Nitrate is used in the combination for increasing the ratio of Potassium and Nitrogen content and Phosphorous acid is used in the combination for increasing the ratio of Phosphorous content or increasing the stability.

5. A concentrated N-P-K fertilizer combination of claim 1 wherein Tri Potassium Phosphate is used in the combination for increasing the ratio of Phosphorous and or Potassium content or increasing the stability.

6. A concentrated N-P-K fertilizer combination of claim 2 wherein Spirulina is added to offer Amino acids to the product.

7. A concentrated N-P-K fertilizer combination of claim 6 wherein Phosphorous Acid crystal and Potassium Nitrate are used in the combination for increasing the ratio of Phosphorous, Nitrogen and or Potassium content respectively or increasing the stability.

8. A concentrated N-P-K fertilizer combination of claim 6 wherein Tri Potassium Phosphate is used in the combination for increasing the ratio of Phosphorous, and or Potassium content respectively or increasing the stability.

9. A method for providing N-P-K to the plants and promoting growth of plants by applying the composition of claim 1.

10. A method for providing N-P-K to the plants and promoting growth of plants by applying the composition of claim 6.

, Description:Highly Soluble N-P-K Fertilizer with Seaweed extract and Spirulina for use in Agriculture.
Field of the Invention and use of Invention:
This invention relates to a Water soluble N-P-K Fertilizer formulation with Seaweed Extract and Spirulina that can be used as a Fertilizer in Agriculture. This invention uses food grade sources of Phosphorous and Potassium unlike the currently available water soluble fertilizers. This invention has many advantages over the presently available fertilizers which will be evident in further description. The inventive product is fully water soluble and can be applied through foliar and drip irrigation systems. It contains many micro elements and naturally occurring trace elements from Seaweed Extract that are responsible for growth and overall development of the plants. It also combines Spirulina that is known to provide protein and many other growth promoting elements required for plant function. This invention overcomes many of the problems associated with conventional fertilizers.

Prior Art and problem to be solved: Powder or granulated N-P-K fertilizers are manufactured in water soluble form which is to be broadcast delivered as a solid or dissolved in water prior to soil application or foliar application. However, storage of hygroscopic solids and liquid Suspensions and the time associated with initial dissolution of such salts and Leaching out of these fertilizers due to limited micro-organisms have proven to be major problem. Conventional Fertilizers are acidic in nature and are known to create an imbalance in soil pH thereby ruining the quality of the soil. For preparation of NPK fertilizer, U.S. Patent. No. US4175943A discloses a method of manufacturing water soluble mixed NPK Fertilizer composition in solid form by dissolving urea in phosphoric acid to form a urea phosphoric acid adduct solution and then adding one or more potassium salts to said adduct while agitating to form a mixture in solid or slurry form. The mixture is then cooled to form granular NPK Fertilizer. The constituents of the final product contains between 5 and 42% nitrogen, between 2 and 15% phosphorus and between 1 and 38% potassium, the resulting composition, in 10% aqueous solution, having a pH of between 1.2 and 2.0.
Due to the use of Chemicals, Fertilizers have an acidic pH that hampers the soil quality. The acidic pH results in affecting the soil ecology and kills the friendly bacteria important for growth of the plants.
In US Patent No US4703108A the process for manufacturing complex NPK fertilizer is disclosed. The process discusses the use of KCl and/or K2 SO4 as a potassium source. It provides a a method for the manufacture of a chloride and/or sulphate-containing complex NPK-fertilizer. It is a well-known fact that chlorides are harmful for the soil and excess amounts can seriously hamper the soil quality and result in decreasing the productivity.
Thus, there exists a need for a water soluble powder N-P-K fertilizer that is fully water soluble with a neutral pH and is chloride free. Also it combines the benefits of naturally occurring seaweed Extracts and Spirulina for providing microelements, amino acids and promoting soil microbial properties.

Objects of the Invention:
The problem with the conventional fertilizers and present available technology is that they are either in granulated form for soil application and cannot be foliar applied. Water soluble NPK powder formulations are available but they create pH imbalance in soils, contains chlorides and also they lack microelements and trace elements in Seaweed extracts and amino acids in Spirulina. The powder or granulated NPK fertilizers affect the soil ecology and are harmful for the microbes in the Soil thereby making the soil infertile in the longer run.
It has already been proposed to have a highly water soluble NPK fertilizer that combines Seaweed Extracts and Spirulina. The inventive fertilizer can be applied via spraying equipment and drip irrigation system. The Principal Object of this invention is to provide a water soluble NPK Fertilizer that has a neutral pH and is not harmful for the soil ecology.
Another object of this invention is to provide a water soluble NPK fertilizer that combines Seaweed Extract to provide microelements and trace elements required for plant growth along with increasing the microbial activity in the soil for better uptake of NPK.
Further object is to create products with different N-P-K ratios to suit the requirement of the crops. Additional object is to have fully water soluble fertilizer with no suspended particles so that the drip system and spraying system isn’t clogged while application.
Further object of this invention is to provide water soluble NPK Fertilizer that combines Spirulina which is an aquatic micro-organism often referred to as algae. It has extremely high protein content, with 60-70% of its dry weight consisting of a balanced mix of various essential amino acids. It is very rich in beta carotene (to produce vitamin A), iron, vitamin B12, ganna-linolenic acid and other micronutrients. It has no cell wall and is therefore very easy to uptake for the plants.
Other objects and advantages of the invention will be apparent from the following description and the appended claims.

Summary of the Invention
The present invention meets the need by providing a water soluble NPK fertilizer having a neutral pH that combines Seaweed Extract containing trace elements and microelements and Spirulina that provides essential amino acids to the plants. The said fertilizer consists of sources of Nitrogen and sources for Phosphorous and Potassium are provided. Source for microelements and trace elements is seaweed extract. Source for amino acids is Spirulina.
The overall nitrogen concentration in the water soluble NPK Fertilizer Concentrate is 1-42% by weight and the fertilizer contains substantially no water insoluble nitrogen compounds.
The overall phosphorous concentration in the water soluble NPK Fertilizer Concentrate is 1-61% by weight and potassium concentration is is 1-50% by weight and the fertilizer contains substantially no water insoluble phosphorous and potassium compounds.
The fertilizer is a mixture of Urea, Dibasic potassium phosphate, Phosphorous acid crystal, Tri potassium phosphate, Potassium Nitrate, Seaweed Extract and Spirulina. The most important aspect is by changing the percentage of Urea, Potassium Nitrate, Dibasic potassium phosphate, Tri potassium phosphate and phosphorous acid crystal, Seaweed Extract and Spirulina various grades of N-P-K can be prepared.
In some embodiments, potassium Nitrate and Phosphorous Acid are present interchangeably or both at between 1 to 20% total weight dissolved in water and contains a Dibasic potassium phosphate as supplement as well as stabilizer. The NPK Fertilizer containing Urea, dibasic potassium phosphate, Seaweed Extract and Spirulina are highly water soluble and does not require large amounts of agitation prior to application through Spraying or drip irrigation equipments.
A process of providing NPK fertilizer to crops includes diluting the fertilizer with water to obtain a liquid fertilizer solution. The liquid fertilizer solution is then applied to the crop and after the absorption by the crops; the fertilizer solution provides nutrition to crop and promotes growth of the crop.

Detailed Description of the Invention
As mentioned, the water soluble N-P-K fertilizer of the present invention is the mixture of three major components, Urea, Dibasic Potassium Phosphate K2HPO4, Spirulina and Seaweed Extract. Tri potassium phosphate, Phosphorous Acid H3PO3 and Potassium Nitrate KNO3 are used in some embodiments.
All the raw materials used are easily available. Urea and Seaweed extract are available in Local fertilizer shops. I choose Urea of “IFFCO” and Sea Pro Powder (concentrated Seaweed Extract) and Spirulina Powder of “Sunraysia”. Dibasic Potassium Phosphate, Tri potassium phosphate and Phosphorous Acid, Potassium Nitrate was sourced from a local Lab chemical supplier.
For the water soluble N-P-K Fertilizer the cheapest and highly water soluble form of Nitrogen is Urea. Urea contains 46% Nitrogen and is highly water soluble. The Solubility of Urea is 1079 g/L (20 °C) therefore nitrogen content can be made from 1% to 40% of any desired formulation. Dibasic Potassium Phosphate contains 40% Phosphorous as P2O5 and 44.78% Potassium and is its Solubility is high 149.25 g/100 mL (20 °C) of water. Dibasic Potassium Phosphate not only provides Phosphorous and Potassium to the NPK fertilizer, but it also has a neutral pH and helps to maintain the pH of the final product. Potassium Nitrate contains 13% Nitrogen and 38% Potassium whereas Phosphorous Acid crystals contain 37% Phosphorous and both are water soluble.
The preferred embodiment of the present invention is to grind Urea and dibasic potassium phosphate powder and Seaweed extract to obtain a fine powder. Further it is sewed, blended and mixed together in a blender to obtain the desired NPK fertilizer with the desired ratios. Additionally Potassium Nitrate and Phosphorous Acid can be Grinded and added to this mixture to adjust the concentration and ratio of N-P-K.
The resultant complete fertilizer with different N-P-K ratios can be prepared and this 1 Kg powder can be diluted in 200 - 400 Litres of water and applied to 1 Acres to 1 Hectare of Vegetables and Fruit Crops. The inventive fertilizer may be stored in pouches for a period of more than a year and can be diluted and used as required. The inventive fertilizer is fully water soluble and will not clog the spraying system or irrigation system as there are no suspended solids in solution and since precipitates are not formed with the present invention.
The following is an example of the preparation of a water soluble fertilizer having these advantageous features.
EXAMPLE 1
The inventive Water soluble Fertilizer with an N-P-K ratio of 19:19:21 was prepared by weighing 415 grams Urea and putting it in the grinder to make a fine powder. 475 grams of dibasic potassium phosphate powder was added to the ribbon blender. Once the urea was grinded and a fine powder was formed it was added to the ribbon blender in which dibasic potassium phosphate was present. Sea Pro (Seaweed Extract) powder was grinded and a fine powder was formed. Similarly Spirulina powder was grinded and a fine powder was formed. 50 grams of fine Sea Pro (Seaweed extract) powder was added to the blender in which 415 grams of urea and 475 grams of dibasic potassium phosphate was present. Spirulina 60 gram was added to the blender and all the powders were mixed in ribbon blender for 30 minutes till a uniform looking powder was obtained.
From this process 1 kg of water soluble N-P-K fertilizer was obtained containing Nitrogen 19%, Phosphorous (P2O5) 19% and Potassium 21%. This 10 grams powder was mixed with 100 ml water and it completely dissolved in water. The pH of the solution was 7 so there would be no side effects to the soil and the microbes when applied in soil.
EXAMPLE 2
A stable, water soluble Fertilizer with an N-P-K ratio of 6:6:6 was prepared by weighing 135 grams Urea and grinding it to a fine powder in a grinder. 95 grams of Phosphorous acid crystal was added to grinder and a fine powder was prepared. 319 grams of seaweed extract was added to grinder and a fine powder was obtained. 300 grams of Spirulina was added to grinder and a fine powder was obtained. In a ribbon blended 135 grams of grinded urea powder, 95 grams of phosphorous acid powder, 319 grams of seaweed powder, 300 grams of Spirulina powder and 151grams of dibasic potassium phosphate powder was mixed for 30 minutes. A uniform water soluble powder with a NPK ratio of 6-6-6 was obtained.
EXAMPLE 3
A stable, water soluble Fertilizer with an N-P-K ratio of 2:2:9 was prepared by weighing 17 grams Urea and grinding it in a grinder. 100 grams of Potassium Nitrate was grinded and a fine powder was obtained. 558 grams of Seaweed extract was grinded and a fine powder was obtained. 200 grams of Spirulina powder was grinded and a fine powder was obtained. In a ribbon blender 125 grams of dibasic potassium phosphate powder was added along with fine powder or 17 grams Urea, 558 grams of fine powder of seaweed extract, 200 grams of Spirulina powder and fine powder of 100 grams Potassium Nitrate obtained after grinding. All the powders were mixed in ribbon blender for 30 minutes to obtain a uniform powder. A uniform water soluble powder with a NPK ratio of 2-2-9 was obtained.
While the compositions and methods described herein constitute preferred embodiments of the invention, it is to be understood that the invention is not limited to these precise compositions and methods, and that changes may be made in either without departing from the scope of the invention, which is defined in the appended claims.

Best Method: While formulating the water soluble NPK Fertilizer, various combinations can be prepared to obtain the desired N-P-K ratios as described in the examples. However it should be noted that all the ingredients should be passed through a grinder to obtain a fine powder. All these powders should be then mixed in a blender for 30 minutes. The obtained final powder should be heated to remove any moisture content and then packed in Pouches. For EXAMPLE to prepare 1 kg of NPK Fertilizer with a ratio of 6-7-16, 100 grams urea, 100 grams potassium nitrate, 300 grams seaweed extract and 300 grams of Spirulina Powder are put in grinder until a fine powder is obtained. Tri potassium phosphate and Potassium phosphate dibasic are powders and do not require grinding to make them fine. In a ribbon blender the fine powders of Urea 100 grams, seaweed extract powder 300 grams, Spirulina powder 300 grams, potassium nitrate 100 grams, potassium phosphate dibasic 100 grams and tri potassium phosphate 100 grams are added and blended for about 30 minutes until a uniform powder is formed. This powder is then removed and heated in microwave for about 20 seconds. It removes the moisture from the powder. The powder can then be packed in air tight pouches for future use.

Cited Patent Filing date Publication date Applicant Title
US4175943 A 18 Jan 1978 27 Nov 1979 Pieter J. Jordaan, Jacobus P. van Deventer Water Soluble Fertilizers
US4713108A 11 Sep 1985 15 Dec 1987 Olav Kjohl, Torstein Obrestad, Hans Groland NPK Complex fertilizer having reduced tendency for swelling and caking