Abstract: A fertilizer composition is provided which is characterized by high mechanical resistance, anti-caking properties, and a substantially white color, and which fertilizer includes urea and a hydrosoluble additive selected from the group consisting of phosphoric acid, solutions of phosphoric acid in water, and phosphoric acid containing compositions, the additive containing P.sub.2 O.sub.5 in an amount sufficient to provide the fertilizer composition with a content of P.sub.2 O.sub.5 by weight of the fertilizer composition of between about 0.2% to about 7.0% such that the fertilizer composition possesses high mechanical resistance and a low tendency to lumping while maintaining a substantially white color and without affecting the capacity of dissolution thereof.

Abstract: Improved release profiles which can, for the first time, be customized to match requirements of systems including crop nutrient uptake are realized by providing a plurality of heterogeneous particles comprised of water-soluble constituents set in a matrix of water-insoluble materials, and further providing a continuous homogeneous barrier of same, or a different water-insoluble material, juxtaposed the peripheral surface of each such heterogeneous particle. A first alternate embodiment includes forming in situ reaction products to reduce the specific gravity of such heterogeneous particles. In a second alternate embodiment, there is substituted for all, or a portion of such water-soluble material, organic media comprised primarily of composted poultry litter wherein soluble iron values remain available for substantial periods of time without incorporating or utilizing expensive conventional synthetic chelating agents.

Abstract: Polymer topcoated sulfur coated fertilizer compositions are provided which exhibit slow release characteristics and are abrasion resistant, free flowing, non-smearing and essentially dustless products.

Abstract: A precipitate free concentrated aqueous stock solution formed from a dry solid fertilizer mixture and containing from about 0.1% to 50% by weight of dissolved solid fertilizer. The stock solution contains phosphorus and calcium and is prepared by bringing together the dry fertilizer mixture and water to make up a concentrated stock solution. The dry solid fertilizer mixture comprises 1% to 95% by weight of dry urea phosphate as the principal phosphorus source and 0.2% to 70% by weight of dry calcium phosphate in the form of monocalcium phosphate, dicalcium phosphate, tricalcium phosphate and mixtures thereof to contribute a desired amount of phosphorus and calcium for fertilization purposes.

Abstract: The present invention relates to a fertilizer composition comprising solution or dispersion of nutrient compounds and method for its manufacture. The solution/dispersion constitutes the discontinuous phase of a water-in-oil type (w-i-o) emulsion having a volume phase ratio, discontinuous phase: total volume in the range of 0.80-0.95. The fertilizer composition may additionally contain 0-60 weight % solid nutrient salts and/or urea. The oil or hydrocarbon component of the w-i-o emulsion comprises mineral, vegetable or animal oils, wax or mixture of these, and the emulsion comprises at least one w-i-o emulsifier. The hydrocarbon component may also contain 0.5-6 weight % of elastomer, preferably polyisobutylene. The method comprises dissolving or dispersing the nutrient compounds at a temperature of 5.degree.-15.degree. C.

Abstract: Urea increases the solute content of a fertilizer comprising water and at least two different nitrate-containing compounds selected from the group consisting of ammonium nitrate, alkali metal nitrates, and alkaline earth metal nitrates. In addition, urea enhances plant uptake of alkaline earth metals. Particularly favored are quaternary aqueous solutions containing urea, calcium nitrate, and ammonium nitrate.

Abstract: The method relates to the production of phospho-nitrogenous products soluble in neutral ammonium citrate and wherein free urea does not remain in significant amount in such products. Most of the free urea is involved in a ureic combination of calcium sulphate. Tricalcic phosphate is reacted with a reactant obtained by mixing sulfuric acid and urea. The process is particularly useful for the manufacture of fertilizers.

Abstract: Solid compound fertilizers for dissolving into stock solutions advantageously employing urea phosphate as a phosphorous source. The use of urea phosphate makes it possible to have calcium present as well as nonchelated trace metals without precipitation.

Abstract: A machine system and process for producing attrition resistant, controlled release fertilizer is described. In the process, a prewet solution is used to initially coat the plant nutrient to be coated followed by the separate application of the individual components used in the coating. The machine system provides an improved means for uniformly applying a single layer or multiple layers of polymer coatings to the plant nutrient.

Abstract: Process for inhibiting the corrosive characteristics of a nitrogenous fertilizing solution comprising incorporating in said nitrogenous fertilizing solution at the moment of its constitution, about 50 to about 150 ppm of at least one of the linear esters of acid phosphates having the formulae; ##STR1## wherein R1 and R2 which are identical or different from one another, are selected from the group consisting of the n-heptyl, n-octyl, n-nonyl and n-decyl radicals.

Abstract: An improved fluid urea-containing fertilizer composition is disclosed; the composition is essentially comprised of an aqueous solution of urea, ammonium nitrate, N-(n-butyl)thiophosphoric triamide (NBPT), dicyandiamide (DCD), and may optionally also contain a clay as a suspending agent. The fluid fertilizer composition can be applied to a field crop in a single application and will nevertheless supply sufficient nitrogen to the plants throughout their growth and maturing cycles. As a result, the improved composition increases the nitrogen uptake efficiency of plants, enhances crop yields, and minimizes the loss of nitrogen from the soil.

Abstract: An improved homogenous granular fertilizer composition is disclosed; the composition is comprised primarily of urea, N-(n-butyl)thiophosphoric triamide (NBPT), and dicyandiamide (DCD). The composition of this invention can be applied to a field crop in a single surface application and will nevertheless supply sufficient nitrogen to the plants throughout their growth and maturing cycles. The new improved composition increases the nitrogen uptake by plants, enhances crop yields, and minimizes the loss of both ammonium nitrogen and nitrate nitrogen from the soil.The NBPT is incorporated into the homogenous granular fertilizer composition of this invention by blending a concentrated solution of NBPT in a solvent selected from the group consisting of liquid amides, 2-pyrrolidone, and N-alkyl 2-pyrrolidones directly into molten urea prior to its granulation; the DCD may be added to the urea melt as a solid or in dissolved form along with the NBPT.

Abstract: A method of preparing a new granular homogeneous metal ammonium phosphate-alkylene urea buffered fertilizer, containing slow releasing water insoluble nitrogen of two types which provide sustained nitrogen release. The method is based on the discovery that a strong metal ammonium phosphate matrix may be formed to homogeneously contain fine particles of alkylene urea compounds. The new buffered fertilizer provides concentrated slow release nitrogens, and phosphate, and buffering amounts of metal nutrients. The alkylene urea may be formed in-situ from liquids concommittantly with the formation of the metal ammonium phosphates, or it may be admixed as finely divided alkylene urea solids. The preferred alkylene ureas are methylene ureas and polymers, isobutylene diurea, and crotonylidene diurea. The metal nutrients are divalent and are preferably magnesium, manganese, zinc, and iron reacted as oxides, hydroxides, or carbonates.

Abstract: An inorganic fertilizer composition that flows freely and resists caking comprising at least one beneficial agent and an anti-caking agent in an amount sufficient to reduce the caking tendency of the beneficial agent wherein the anti-caking agent is tripotassium phosphate. In a preferred embodiment, the anti-caking agent is added in amount in the range of 0.25% to 5.0% by weight.

Abstract: A new method of preparing a new aminoureaformaldehyde fertilizer composition which exhibits high cold water insoluble nitrogen (CWIN) levels and high Availability Indices (AI). The method utilizes the discoveries that ammonia compounds, usually ammonium salts, inhibit the urea-formaldehyde polymerization reaction and decrease the formation of hot water insoluble nitrogen (HWIN), and that the ammonium compounds take part in the reaction to form controlled release compounds which are both cold water soluble and insoluble. The process is carried out at elevated temperatures between 60 and 125.degree. F., so that it may be completed in an order of magnitude less time than either the dilute or concentrated conventional commercial ureaform processes, requiring between 2 and 20 minutes for completion. In the process, between 3 and 25 percent of the total nitrogen is supplied as ammonia nitrogen with the remainder from urea, respective formaldehyde to urea to ammonia mol ratio is 1.0, between 1.0 and 2.

Abstract: A nitrification-inhibiting agent is described which is characterized in that it comprisesa) dicyandiamide andb) guanylthiourea and/or ammonium thiosulphate and/or ammonium phosphate.This agent is distinguished by an increased activity compared to the individual components and by its low toxicity.

Abstract: The invention provides a neutral granular fertilizer comprising a neutral fertilizing composition containing as essential ingredients nitrogenous, phosphatic and potash fertilizers and an organic acid, and 10-20 parts by weight of plaster per 100 parts of the fertilizing composition.It also provides a neutral powdery fertilizer in the form of finely divided and uniform dispersion comprising a neutral fertilizer containing as essential ingredients nitrogenous, phosphatic and potash fertilizers and an organic acid.

Abstract: The present invention provides a neutral liquid fertilizer comprising as essential ingredients nitrogenous, phosphatic and potash fertilizers and an organic acid, and a thickener, and also provides a process for preparing the same.

Abstract: Solid compound fertilizers for dissolving into stock solutions advantageously employing urea phosphate as a phosphorous source. The use of urea phosphate makes it possible to have calcium present as well as nonchelated trace metals without precipitation.

Abstract: Process of furnishing slow release nitrogen to field soil comprising inserting and distributing in the soil in particulate or granular form melamine, ammeline, ammelide, cyanuric acid, mixtures thereof, their salts, and mixtures thereof.

Abstract: The present invention utilizes inexpensive, low-quality by-product ammonium sulfate (AS) characterized as having poor storage, handling, and use properties and normally unsuitable for use as a solid fertilizer because crystals thereof are very fine and of a undesirably high-moisture content. This invention involves production of high-quality, long-storing suspension intermediates directly from AS slurries or AS crystals, followed by storage of the resulting suspensions as intermediate raw materials, and further followed by production of solution fertilizers from such suspension intermediates.

Abstract: A storage-stable dispersion providing melamine in the form of a concentrated liquid for effective use as an end product or as an ingredient for conversion into other products. The dispersion contains melamine particles finer than about 50 microns in diameter, admixed with a chemically inert suspending liquid, having a specific gravity between 0.9 and 1.3 grams per milliliter, containing between 0.03 and 0.20 percent of a chemically inert thickening agent, which interacts physically with the suspending liquid to increase viscosity to between 250 and 3000 centipoise, thereby substantially maintaining the melamine particles in a stable dispersion and preventing their settling. The dispersion composition is an effective form of melamine for accurate dispensing as an agricultural, pulp and paper, or fire-retardant ingredient. Effective thickening agents include xanthan gums, carrageenans, polyacrylamide, chemically treated cellulose, and clays.

Abstract: A carrierless granular slow release fertilizer composition is prepared by spraying a urea-formaldehyde resin composition having a U/F molar ratio ranging from 2.4 to 13.3 onto finely divided solid particulate raw materials and cooling the resulting sprayed product to solidify the resin composition providing a matrix within which the solid particulate raw materials are bound. The fertilizer composition is characterized by having desired physical and chemical properties in regard to chain length of nitrogen polymers in the product, nitrogen release patterns, hardness and dust free nature of the product and the dispersibility characteristics of the product. The product has an abrasion index of about 0.800-1.000.

Abstract: An agricultural fertilizer material is provided which is resistant to agglomeration, powdering and burning of plant life and which is made up of lightweight blast furnace slag having a water content in the range of about 3% to 5% and mixed with about 10% to 35% by weight of a mixture of nitrogen, phosphoric acid and potash as conventional nutrient salts, said salts and nitrogen being present in amounts sufficient to provide at least 1% by weight of nitrogen on the total mix and said slag having a CaO equivalent of about 20% to 25%.

Abstract: Soybean meal and urea compositions have been found to exhibit enhanced and commercially useful nematistatic and nematicidal activity in soils. Chitin-containing materials, e.g., crab shells, shrimp shells, fungal mycella, etc., have also been found to exhibit enhanced and commercially useful nematistatic and nematicidal activity in soils when admixed with other organic nitrogen-containing materials such as ammonium phosphates, a source of urea, and plant, fish or animal meal. Also, compositions formulated of two different chitin source materials can be used. The soybean-urea compositions as well as the blended chitin-containing formulations are non-phytotoxic and simultaneously provide cost-effective biological suppression of plant pathogenic nematode populations and excellent plant nutrition.

Abstract: Unusually high-analysis low-temperature-stable solution-type fertilizers are produced by mixing urea and phosphoric acid with urea-ammonium nitrate solution (UAN). The ratio of P.sub.2 O.sub.5 to total nitrogen and the ratio of CO(NH.sub.2).sub.2 --N(nitrogen) to NH.sub.4 NO.sub.3 --N(nitrogen) must be maintained within broad specified parameters in order to ensure the production of the instant high-analysis clear-liquid fertilizers which are stable at temperatures as low as 0.degree. C. For example, to produce a 35 percent total plant nutrient (TPN) product, the weight ratio for P.sub.2 O.sub.5 :N (total) must be within the range of about 0.316 to about 0.538, the weight ratio of urea-N to NH.sub.4 NO.sub.3 --N+P.sub.2 O.sub.5 must be in the rang of 1.41 to 1.59, and the weight ratio of CO(NH.sub.2).sub.2 :NH.sub.4 NO.sub.3 must be in the range of 15.25 to 3.75. Similar solutions may be produced by dissolving solid urea and ammonium nitrate in pure or impure phosphoric acid or by utilizing urea.H.sub.3 PO.

Abstract: A fertilizer composition and method for the detoxification and deacidification of soil threatened by acidic deposits which comprises at least one alkali-reactive component, selected from the group which consists of calcium, magnesium, potassium, sodium, ammonium and ammonia compounds in soil neutralizing amounts and at least one water soluble pyrophosphate or polyphosphate capable of forming water insoluble salts with aluminum and heavy metals of a similar magnitude as the diphosphates.

Abstract: An improved aqueous nitrogen fertilizer has been developed that increases first-year nitrogen uptake efficiency to plants. It is also a nitrogen with features to minimize exposure to nitrogen loss. It is a nitrogen fertilizer consisting of urea, ammonium nitrate, dicyandiamide, ammonium thiosulfate, and a phosphate compound which is preferably an ammonium phosphate compound. This composition can contain a herbicide and/or various micro nutrients. This aqueous fertilizer solution can be applied to a field crop in a single application and is available to the growing plant throughout its growth and maturing cycle. The aqueous fertilizer composition is conveniently prepared by the addition of a slurry containing dicyandiamide, ammonium thiosulfate and the phosphate compound to a urea-ammonium nitrate solution wherein the nitrogen content has been adjusted to account for the nitrogen that will be supplied by the slurry.

Abstract: A foliar fertilizer specifically for iron deficient plants which contains a complex of various ingredients such as citric acid admixed/reacted with ferrous sulfate previously converted at-least predominantly to ferric sulfate by oxidation at about 90 degrees or more centigrade or a neutralizing amount of ammonium ion, to a pH ranging from about pH 6 to about pH 7, the ferrous sulfate being typically produced by reaction of iron metal with sulfuric acid, excluding the presence of any phosphate salt, neutralized with NH.sub.4 OH, then admixed with urea and/or ammonium nitrate, the total mixture critically having a nitrogen-to-iron ratio of not less than (i.e., at least) 3/1, preferably within a range of about 4/1 to about 5/1, in aqueous solution, and the method including using the above-noted fertilizer complex as a source, diluting with water such that the source as a percentage ranges from about 5% to about 40%, followed by foliar spraying onto plant foliage, up to an application of about 5 lbs.

Abstract: A process for preparing suspension fertilizers wherein nutrient material and at least one crystal growth inhibitor are mixed, potassium chloride is added, the resultant slurry mixed and subsequently a suspending aid, for example a clay, is added with mixing.

Abstract: An improved aqueous nitrogen fertilizer has been developed that increases first-year nitrogen uptake efficiency to plants. It is also a nitrogen fertilizer with features to minimize exposure to nitrogen loss. It is a nitrogen fertilizer consisting of urea, dicyandiamide, ammonium thiosulfate, and optionally a phosphate compound which is preferably an ammonium phosphate compound. This composition can contain a dye and/or various mineral micronutrients. This homogeneous granular fertilizer can be applied to a field crop in a single application and is available to the growing plant throughout its growth and maturing cycle. The homogeneous granular fertilizer composition is conveniently prepared by the addition of a dicyandiamide, and a solution of ammonium thiosulfate to molten urea. A phosphate compound and preferably ammonium polyphosphate, would be added along with these components.

Abstract: A one-step method of preparing coated particulate plant nutrients wherein a polyfunctional coupling agent is applied to a mobile mass of plant nutrient particles containing functional groups which are chemically reactive with the functional groups of the coupling agent, while simultaneously applying a second reactive material containing functional groups also reactive with the functional groups of the coupling agent, maintaining the mobile mass at a temperature between 30.degree. C. and 300.degree. C. until a strong, water-insoluble particle. The product of the one-step method is a controlled-release plant nutrient having excellent attrition resistance.

Abstract: Urea and sulfuric acid are reacted in an air-water spray in cocurrent heat exchange therewith to produce concentrated urea-sulfuric acid solutions.

Abstract: The instant invention relates to a method utilizing relatively high frequency oscillations for dispersing channelized 2:1 clays during the production of fertilizer suspensions to therein form gels as opposed to the use of mechanical energy such as, for example, that imparted by a pump or agitator. The instant sonic gelling method is effective for use with all fertilizer suspension systems containing the channelized 2:1 clays, sepiolite or attapulgite. The method involves situating the fluid fertilizer-clay mixture to be gelled in juxtaposition with ultrasonic (i.e., sonic) energy generating means.

Abstract: The invention described herein comprises two principal embodiments. The first embodiment comprises operating procedures related to the instant invention which along with urease inhibition test results demonstrate the use of two classes of N-Halamine compounds (N,N'-DIHALO-2-IMIDAZOLIDINONES and N-HALO-2-OXAZOLIDINONES) as inhibitors of the activity of the enzyme urease in solution and agricultural soil systems. The second embodiment comprises operating procedures related to the instant invention which along with nitrification inhibition test results demonstrate the use of the two classes of N-Halamine compounds (N,N'-DIHALO-2-IMIDAZOLIDINONES and N-HALO-2-OXAZOLIDINONES) as inhibitors of nitrification in agricultural soil systems.

Abstract: Methylene diurea, either alone or as a component of methylene urea polymers acts as a gelling agent for producing a gel composition capable of suspending particles which are insoluble in a liquid medium. Methylene diurea as the gelling agent in a liquid medium can be used to obtain novel gel compositions in the absence of added thickener-suspending agents. The methylene diurea is present in an amount greater than the solubility limit of methylene diurea in the liquid medium and in an amount sufficient to provide a gel for suspending insoluble particles. The process for producing the gel composition includes subjecting a dry methylene urea composition in particulate form to a shearing action in a liquid medium wherein the methylene urea includes an amount of methylene diurea greater than the solubility limit of methylene diurea in the liquid medium.

Abstract: The invention concerns a method of producing fertilizer granules containing urea and ammonium sulphate by granulating a mixture containing urea, ammonium sulphate and water, which is characterized in that the ammonium sulphate is completely dissolved in an aqueous urea solution with a urea concentration of 70-85% by weight, the resulting solution is thickened to a dry content of 92-97% by weight, with a granulation additive for the urea being added in any stage of the treatment, following which the thickened solution is granulated in a fluidized bed of urea and ammonium sulphate containing nuclei.

Abstract: The first embodiment of the present invention relates to my discovery that thiophosphoryl triamide can be utilized as a nitrification inhibitor for controlling the nitrification of ammonium to nitrate. The second embodiment relates to my discovery that this same compound can be used to control, within predetermined limits, the ammonium/nitrate ratios in urea-based fertilizers, by serving as a dual-purpose inhibitor to control both urease inhibition and nitrification inhibition and thereby maximize plant response characteristics in direct proportion to nutrient value amendments to the soil environment.

Abstract: A process for producing a methylol urea solution which comprises carrying out addition reaction between urea and formaldehyde in the presence of water and an alkali, wherein said alkali is a polyphosphoric acid salt; and a process for producing a slow-releasing nitrogenous fertilizer which comprises subjecting the resulting methylol urea solution to dehydration condensation and drying the resulting condensate are disclosed. The methylol urea solution undergoes no substantial pH variation with time either during or after the addition reaction, and the fertilizer obtained therefrom is excellent in slow-releasing properties.

Abstract: Relates to a fertilizer product in granular form, to processes for making and using it. The granules have strength, sizes and weights suitable for mechanical dispensing and application to and into the soil. These granules combine particles of a nitrogen source of poor solubility in pH 7 water at 20.degree. C., that converts slowly to a useful form, together with a binder that holds these fine particles together.

Abstract: An attrition-resistant, controlled release fertilizer comprising a water-soluble central mass containing nucleophilic reactive functional groups surrounded and chemically bonded to a base coating formed by reacting a molecular excess of a coupling agent with the nucleophilic groups of the central particles, and a water-insoluble layer, surrounding and chemically bonded with the base coating, formed by the reaction and polymerization of the excess functional groups of the coupling agent used in forming the base coating is described. A preparation method is provided.

Abstract: A hydrolyzed lignosulfonate-acrylonitrile graft copolymer matrix providing a slow release solubility to fertilizers. The hydrolysis of the graft copolymer of lignosulfonate and acrylonitrile may be carried out in the presence of an alkali in situ during the fertilizer manufacturing process or in a prehydrolysis step with subsequent use of the hydrolyzed copolymer in the fertilizer manufacturing process to provide a controlled release formulation for various fertilizers.

Abstract: A two stage method for preparing clear, storage stable, controlled release polymethylene urea nitrogen fertilizer solution. In the first stage, urea is reacted with a molar excess of formaldehyde, with temperatures of 75.degree. to 100.degree. C., at near-neutral pHs provided by buffers such as sodium bicarbonate, in the presence of ammonium compounds, until the formaldehyde is substantially converted to methylene moeities. In the second stage, the methylene moeities are reacted with additional urea and ammonium compounds, with temperatures of 75.degree. to 100.degree. C., in a near-neutral buffered solution at a pH of between 6.9 and 8.5, until the added urea is substantially converted to water soluble branched chain polymethylene ureas. Optimum urea to formaldehyde mol ratio in the first stage is between 0.483 and 0.518 to 1 and in the second stage optimum ratio is between 1.3 and 1.5 mols urea per mol of formaldehyde.

Abstract: The invention relates to novel urease inhibited fertilizer compositions containing urea and a urease inhibiting amount of one or more diaminophosphinyl compounds having oxidized sulfur functions, and methods and composition for inhibiting the activity of urease through use of such compounds.

Abstract: The herein described practice and operating procedures relating to the instant invention have demonstrated the utility and economic advantages of slightly acidic, neutral, and slightly basic fluid fertilizer solutions containing urea and the urease inhibitor thiophosphoryl triamide in preventing or at least substantially reducing the loss of ammoniacal nitrogen from soils to which such fluid fertilizers are often surface applied. The results of said testing procedures also demonstrate a new, novel, and heretofore unknown method of utilizing said thiophosphoryl triamide in conjunction with urea which method circumvents the problem usually encountered in the practice of prior art processes of rapid inhibitor decomposition in solid mixtures with urea.

Abstract: Test show that 2,2,4,4,6,6-hexaaminocyclotriphosphazatriene, 2-phenoxy-2,4,4,6,6-pentaaminocyclotriphosphazatriene, 2,4-diphenoxy-2,4,6,6-tetraaminocyclotriphosphazatriene and 2,4,6-triphenoxy-2,4,6-triaminocyclotriphosphazatriene (also frequently called phosphonitrilic derivatives) of the formula ##STR1## are highly effective inhibitors of urease activity in agricultural soil systems wherein(1) R.sub.1 . . . R.sub.3 '=NH.sub.2 or(2) R.sub.1 '=R.sub.2 '=R.sub.3 '=R.sub.2 =R.sub.3 =NH.sub.2 and R.sub.1 =OC.sub.6 H.sub.5 or(3) R.sub.1 '=R.sub.2 '=R.sub.3 '=R.sub.3 =NH.sub.2 and R.sub.1 =R.sub.2 =OC.sub.6 H.sub.5 or(4) R.sub.1 '=R.sub.2 '=R.sub.3 '=NH.sub.2 and R.sub.1 =R.sub.2 =R.sub.3 =OC.sub.6 H.sub.5.

Abstract: Methods of application and compositions of foliar fertilizers are specifically chosen to address crop nutritive demands varying with growth stage. Two separately timed applications of foliar fertilizers are described. One corresponds to a bud emergence or seedling germination stage of plant development and the other corresponds to a reproductive or fruiting period of the crop's life cycle. Concentrations of required nutrients are related to the amount removed in crop production. Leaf surface penetration enhancers are added to each foliar fertilizer to increase nutrient uptake by the plants.

Abstract: A process for preparing a fertilizer, releasing nitrogen slowly, containing ureaform and at least one other fertilizing material, whereinurea and formaldehyde are reacted in aqueous phase at temperatures ranging from 30.degree. to 60.degree. C., and at the following molar ratios: urea/formaldehyde from 1.2 to 2; water/urea from 0.7 to 10, the reaction being carried out at a pH ranging from 2 to 4, by addition of an acid substance;the so-obtained ureaform aqueous suspension is mixed with at least one other fertilizing material and with a portion of the (recycled) final product in an amount such as to give to the mixture a pH ranging from 4.0 to 5.5; the mixture is granulated at temperatures ranging from 50.degree. to 85.degree. C.;before the granulation ends, the pH of the product is increased to values ranging from 5.8 to 7 by the addition of an alkaline substance;the product is dried, and a portion thereof recycled as indicated.

Abstract: Granular fertilizer solids comprising ammonium phosphate, advantageously particulate NP/NPK fertilizers, are prepared by (i) granulating a liquid/dry solids admixture of fertilizer values in a granulation zone, (ii) next transferring said admixture to, and drying same, in a drying zone, (iii) while simultaneously injecting into said drying zone a jet spray of a slurry of ammonia neutralized acid values discharged from a pipe reactor, such that (iv) said jet spray directly impinges upon drying particles of wet solids transferred from said granulation zone, and whereby (v) dried final product simultaneously results therefrom, and (vi) then recovering a fraction of said dried final product, while (vii) recycling another fraction thereof, as dry solids, to said granulation zone.

Abstract: A method of making fertilizer comprising the steps of mixing an aqueous solution of sulfuric acid with diammonium phosphate in a weight ratio of diammonium phosphate to sulfuric acid from about 3 to about 5, and mixing the resulting reaction products with urea in a weight ratio of urea to sulfuric acid from about 7 to about 10. The resulting fertilizer has low corrosion properties and has a salt-out temperature below about 0.degree. F.