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Fertilizing Composition Containing Phosphorite and Tannins

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Fertilizing Composition Containing Phosphorite and Tannins Europäisches Patentamt (19) European Patent Office Office européen des brevets (11) EP 1 097 912 A2 (12) EUROPEAN PATENT APPLICATION (43) Date of publication: (51) Int. Cl.7: C05B 1/00, C05F 5/00, 09.05.2001 Bulletin 2001/19 C05F 11/00 (21) Application number: 00123413.7 (22) Date of filing: 02.11.2000 (84) Designated Contracting States: (72) Inventors: AT BE CH CY DE DK ES FI FR GB GR IE IT LI LU • Miele, Sergio MC NL PT SE TR 56123 Pisa (IT) Designated Extension States: • Bargiacchi, Enrica AL LT LV MK RO SI 57012 Castiglioncello (IT) (30) Priority: 03.11.1999 IT MI992296 (74) Representative: Modiano, Guido, Dr.-Ing. et al (71) Applicant: Agroqualita S.r.l. Modiano & Associati SpA 20123 Milano (IT) Via Meravigli, 16 20123 Milano (IT) (54) Fertilizing composition containing phosphorite and tannins (57) A fertilizing composition for organic farming, based on the association of a soft ground rock phos- phate or phosphorite in ground form with an organic product of vegetable origin which is based on tannins. EP 1 097 912 A2 Printed by Xerox (UK) Business Services 2.16.7 (HRS)/3.6 12EP 1 097 912 A2 Description [0009] This drawback has been solved, in the field of conventional non-organic farming, by increasing the [0001] The present invention relates to a fertilizing plant bioavailability of the phosphorus that is present in composition which is particularly suitable for organic natural phosphates by way of their reaction with mineral farming. 5acids (sulfuric, nitric and phosphoric acid and mixtures [0002] In particular, the present invention relates to thereof), thus providing the wide class of phosphatic a fertilizing composition which has high phosphorus and phosphatic nitrogenous chemical fertilizers. assimilability and is specifically indicated for use in the [0010] This solution is instead forbidden, by cur- field of organic farming. rently applicable statutory provisions, for products used [0003] The expression "organic farming" desig- 10 in organic farming. This is a threat to the long-term pro- nates the set of agronomic techniques, based on natu- ductivity of organic cultivations owing to the gradual ral interactions between viable organisms, pedoclimate impoverishment of phosphorus on the part of organic and human action, which excludes the use of synthetic farming soils. chemical products. [0011] In the current art, therefore, there is the need [0004] This specific field has long been regulated 15 to have new fertilizing preparations indicated for use in by the EEC by issuing a number of regulations, subse- organic-type cultivations which allow to meet the phos- quently transposed by the various national law systems, phorus demand of the soil in full compliance with the concerning the technical means, such as fertilizers, that applicable statutory provisions. can be used in organic farming. The relevant standards [0012] It has now been found unexpectedly that it is are constituted by the following regulations: 2092/91, 20 possible to prepare a fertilizing composition with high 94/92, 1535/92, 2078/92, 2083/92, 3457/92, 3713/92, assimilability of the phosphorus contained therein which 207/93, 1593/93, 2608/93, 468/94, 688/94, 1468/94, fully complies with the principles of organic farming and 2381/94, 2580/94, 1201/95, 1202/95, 1935/95, 418/96, has many application advantages with respect to soft 522/96, 314/97, 345/97, 1488/97, 1367/98, 1900/98. ground rock phosphates or phosphorites, which are cur- [0005] The above cited regulations prescribe that 25 rently used as such or mixed with various organic sub- among phosphatic fertilizers, soft ground rock phos- stances allowed in the formulation of organic-mineral phate or phosphorite is the only product having a fertiliz- fertilizers. ing action which does not have limitations of use linked [0013] In formulating the solution to the above prob- to the type of soil where the applications occur (as lems, the Applicant has taken into account the fact that instead occurs for aluminum calcium phosphate) or 30 the statutory provisions that govern organic farming linked to need recognized by the inspection body or allow for the unlimited use, as cultivation fertilizers, of inspection authority, as occurs for example in the case organic products and byproducts of plant origin and of phosphatic slag. derivatives of wood that has not been subjected to [0006] Natural phosphates are compounds which chemical treatment and, in case of need recognized by are characterized in that they contain appreciable quan- 35 the inspection body or inspection authority, also of prod- tities of apatites having the general formula ucts of animal origin and elemental sulfur. Ca5X(PO4)3, where X is chosen among F, Cl, OH or a [0014] Within the scope of the present invention, carbonate group (CO3)1/2, sometimes mixed with cal- the aim is to provide a fertilizing composition with high cite and calcium fluoride. phosphorus assimilability which can be used in organic [0007] Among the sources of natural phosphates, 40 farming. those that originate from Northern Africa and are of sed- [0015] Another object of the present invention is to imentary origin are termed "soft ground rock phos- provide a fertilizing composition which includes a natu- phates" owing to their physical characteristics and to the ral component having a high phosphorus content which high presence of gypsum. This kind of natural phos- is capable of preventing the impoverishment of this ele- phate is usually chosen for direct applications, since it is 45 ment in cultivated soil, following the dictums of organic characterized by a high specific surface (1 g of product farming. ground to 104-107 µ has a surface of 14-19 m2 against [0016] In view of these aims and these and other 3-7 m2 of natural phosphates from American sources) objects which will become better apparent hereinafter, a and by a significant reactivity in citric acid (Lowrison fertilizing composition for organic farming is provided G.C., 1989, Fertilizer Technology, Ellis Horwood Ltd. 50 according to the present invention, which is character- United Kingdom), and both characteristics are poten- ized in that it comprises a soft ground rock phosphate or tially connected to the soil solubility of the phosphorus phosphorite in ground form in association with a tannin contained therein. based vegetable product. [0008] However, it has been found that the fertilizing [0017] The soft ground rock phosphate or phospho- efficiency of soft ground rock phosphates is very low in 55 rite that is used, advantageously has a P2O5 content of soils having a pH above 7-7.5, which constitute the vast more than 25% by weight, of which at least 55% is sol- majority of the cultivated farming surfaces in EU coun- uble in 2% formic acid, and a grinding fineness by way tries. of which at least 95% passes the screen with 0.063 mm 2 34EP 1 097 912 A2 mesh. veniently, elemental sulfur is used having the character- [0018] According to a preferred embodiment of the istics defined by EC directive 76/116 as amended by EC invention, said tannins are extracted physically prefera- directive 89/124. bly from chemically untreated wood after felling the [0028] The fertilizing composition according to the plant. Conveniently, the tannin extract derives from a 5invention is advantageously provided in the form of purely physical process for leaching the wood in chips granules or pellets having dimensions from 0.1 to 5 mm, exclusively in water. Preferably, the wood used is chest- preferably from 0.1 to 1.5 mm, even more preferably nut wood and is not treated chemically after gathering. from 0.5 to 1 mm. [0019] The leachate is then concentrated with an [0029] It has been found that the fertilizing and osmosis process until a product preferably having a tan- 10 phosphorus integration capacities are optimized when nin content from 40 to 50% by weight is obtained. the composition is used, in organic farming, for bedding [0020] The process for extraction from the during sowing or planting of grassy and arboreal cultiva- untreated wood produces a vegetable extract with a tions. high tannin content. [0030] The doses of use of the fertilizing com- [0021] Advantageously, the tannin extract content 15 pounds vary according to the type of cultivation and soil contributes to the formulation of the composition from 1 to be treated, and advantageously vary from a minimum to 40%, preferably 1 to 10%, by weight of the dry frac- of 100 to a maximum of 400 kg/ha when the dimensions tion. of the granules or pellets are from 1.5 to 5 mm and from [0022] It has been found unexpectedly that the 30 to 200 kg/ha when the particle size is on the order of association of a soft ground rock phosphate or phos- 20 0.1-1.5 mm. phorite in ground form with an organic product of vege- [0031] The fertilizers according to the present table origin based on tannins provides a synergy of invention can be prepared by using conventional-type fertilizing action which is rendered evident by the abun- mixers, mixing the starting components in solid or liquid dance of biological crops obtained from the treated form, the latter being optionally wet in rotating drums in soils. 25 order to facilitate a more uniform distribution, which is [0023] According to a preferred embodiment of the followed by drawing for pelletized products or by granu- invention, the formulation of the fertilizing composition lation with optional final drying, screening and recircula- also comprise a compound or a natural nitrogenous or tion of the granules having a diameter which is greater phosphatic-nitrogenous organic fertilizer. or smaller than the intended diameter.
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