Barabara Novak is an agronomic engineer and consultant who participated in the European Biostimulant Industry Council (EBIC) that interfaced with the European Commission (EC) with the aim to promote the development of suitable regulatory frameworks for biostimulants and specialty fertilizers. Novak presented a paper at the FERTASA Biofertilizer Workshop held in November 2017 on the European perspective of the development of the biostimulant / biofertilizer concept and definition and its implications for product placement in EU regulatory frameworks. The use of biological products in agriculture and crop chemistry has gained considerable attention in the last ten years, and is now no longer considered as a “fad” of “fly by night” product segment and has evolved into a structural component of the crop chemicals market. They are considered as one of the most attractive investment segments in the crop chemicals industry with forecasted double digit growth for the next ten years. Novak explained that the group of biological plant nutrition products that are referred to as biofertilizers in South Africa are referred to as biostimulants, metabolic enhancers, phytostimulators, plant elicitors, biogenic stimulators amongst other terms in other countries. The term biofertilizers used in South Africa refers to a specific group of products that are termed as biostimulants in Europe – biofertilizers are referred to as biostimulants for the remainder of this article. The wide range of terminology and definitions used to describe these products is considered as one of the key barriers for growth of this segment of the industry and has created confusion in the market with negative implications for market development such as a lack of market information and product registries which influences industry validation which in turn is influences end-user acceptance and creates mistrust. Novak stressed that possibly the most important outcome is that a science based and industry accepted definition is a prerequisite for the development of a regulatory framework that can distinguish these products from existing legislative product categories. The Development of the European Biostimulant Definition Currently these is no regulatory or legally-accepted definition of biostimulants anywhere in the world including the European Union (EU). Literature reviews indicate that the term was first used in 1997 in a web journal for turf professionals where biostimulants were defined as “materials that in minute quantities promote plant growth”. The use of the words “minute quantities” distinguish biostimulants from fertilizers which also promote plant growth but in much larger quantities. In 2007 the term was first defined in scientific literature as “materials other than fertilizers, that promote plant growth”. The addition of the phrase “other than fertilizer” is significant as an early attempt to explicitly distinguish this class of compounds from traditional fertilizer products. In subsequent years the term has been used to define an even wider range of compounds and has been used as a versatile descriptor of virtually any substance beneficial to plants without being a fertilizer, Plant Protection Product (PPP) or soil improver. Clearly there was a necessity clarify the status of biostimulant products not just…
For centuries man used rudimentary techniques in his endeavors to fertilize the soil and make crops grow, however it was only after Justus von Liebig established conclusively that “green plants can be nourished by mineral salts in solution and specified that there are three essential elements for plant growth Nitrogen (N), Phosphorus (P) and Potassium (K)” that the industrial production of chemical fertilizers developed onwards from the 1880’s. By 1888 the French had passed the first laws governing the use of fertilizers which required in particular that the manufacturer indicate the percentage of the nutrients (N, P and K) and their origin which remained in place until the late 1970’s when the rapid development of agriculture and emergence of new products especially fertilizer mixtures made it’s revision necessary. Today there are complex laws governing the manufacture of fertilizers and their use through-out the world. Agricultural research and development has proven extremely successful over the past century increasing crop production ensuring food security for an ever-growing world population through improved genetics, crop protection, the efficient use of fertilizers and advanced understanding of plant and soil chemistry and nutrition. Numerous other factors that influence and benefit plant growth have been identified and used advantageously as “biostimulants” and “biofertilizers”. The benefits of leguminous crops on the soil had been recognized for centuries however in was only in 1901 that biological nitrogen fixation was first discovered and in the 1950’s that research started to make headway. The symbiotic effects of fungi with plant roots was first studied in the 1880’s and the term mycorrhiza was introduced in 1885. The discovery of Plant Growth Substances began with Darwin’s discovery of Auxins in 1880 followed by Ethylene in 1917, Gibberellins in 1926, Cytokinins in the 1950’s and Abscisic acid in 1963. Seaweeds have historically also been used as fertilizers but use declined with the advent of chemical fertilizers. In the 1970’s the beneficial effects of the brown seaweed Ecklonia maxima (kelp) were identified and extraction methods of the cellular content developed; in 1983 the first doctoral thesis on the beneficial properties of its extracts was published. Over the past two decades there has been tremendous worldwide growth and development of the Biofertilizers, Biostimulants and Biopesticides market which is now a fast growing and lucrative segment of the crop chemicals industry. By definition these products are classified as fertilizers and are subject to world-wide regulation just like conventional fertilizers. The registration of these products and international law governing their use are however far more complex as in many cases involve the use of living organisms and metabolites which may have environmental implications; they are regulated by Act 36 of 1947 as Group 3 fertilizers and at least 8 other Acts of legislation in South Africa. In February 2016 the Department of Agriculture, Forestry and Fisheries (DAFF) published their guidelines for the registration of Group 3 Fertilizers, these can be accessed on the following link: http://www.nda.agric.za/doaDev/sideMenu/ActNo36_1947/AIC/DAFF%20GROUP%203%20FERTILISER%20GUIDELINE%20Final%2011%20february%202016%20(2).pdf In November 2017 FERTASA hosted a Biofertilizer Workshop which was open to…
Sulphur (S) is one of the secondary macro nutrients that has often been forgotten or neglected in planning a fertilizer program. The general “rule of thumb” was that crops required the same amount of S as they do phosphorus. Prior to the advent of high grade phosphates which form the back bone of todays NPK bulk blends the S requirement of crop was supplied through NPK compound containing AMS, single super phosphate, enriched super phosphate and ammoniated super phosphates such as AMP(16), and atmospheric S from industrial SO2 emissions. Alternative sources of S are found in Potassium Sulphate, ASN and Ammonium Sulphate. The cheapest source of S is from gypsum. Disclaimer: The figures published are not a guarantee of analysis, they are sourced from published Product Data Sheets and provided to serve as an indicator of typical analysis which may vary due to production processes, impurities and changes in minerology of natural sources. Please note: Consult a qualified person (Act 36 of 1947) for specific applications / recommendations.
All figures quoted should be considered as a typical product analysis and may vary due to manufacturing process and raw materials. PHYSICAL PROPERTIES A granular crystal or fine crystalline white powder. Critical Relative Humidity @ 30ºC: 90.5. Solubility @ 20ºC: 47 g/100ml of water (31% concentration). Water quality is critical in determining solubility, in some areas advisors recommend 25g /100ml water (20% concentration) to ensure solubility. CHEMICAL PROPERTIES Chemical formula: KNO3. 38% Potassium (K). 13% Nitrogen (N). Salt index: 74 (relative to Sodium Nitrate at 100). Acidification index: non acidifying AGRONOMIC BENEFITS Suitable for crops that are sensitive to chloride. Technical grade product should preferentially be used for foliar feeding and drip irrigation. Compatible for blending with MAP, LAN, Urea, Ammonium Sulphate ,Potassium Chloride. Please note: Consult a qualified person (Act 36 of 1947) for specific applications / recommendations.
All figures quoted should be considered as a typical product analysis and may vary due to manufacturing process and raw materials. PHYSICAL PROPERTIES A generally spherical shaped granular product. Colour generally light to dark grey. Critical Relative Humidity @ 30ºC: 75 – 85. CHEMICAL PROPERTIES A mono calcium phosphate. Chemical formula: Ca(H2PO4)2 . H2O. 19 – 23% Phosphorus (P). Over 90% of the P in TSP is water soluble. 15.5 – 17.1% Calcium (Ca). 1 – 2.3% Sulphur (S). Salt index: 10.1 (relative to Sodium Nitrate @ 100) AGRONOMIC BENEFITS TSP provides the highest concentration of straight phosphate fertilizer that is available. Provides a P source for production of blends for leguminous crops where no additional nitrogen is desired. Granules dissolve rapidly in the soil in the presence of adequate soil moisture. Compatible for blending with LAN, Potassium Chloride, Potassium Sulphate, Potassium Nitrate. Please note: Consult a qualified person (Act 36 of 1947) for specific applications / recommendations.
All fertilizer products sold in South Africa must be registered in terms of the Fertilizers, Farm Feeds, Agricultural Remedies and Stock Remedies Act, 1947 (Act 36 of 1947) and are sold with a specific registered plant nutrient concentration which is printed on the fertilizer packaging. The South African fertilizer industry manufactures a broad range of fertilizer products as compounds or mixtures which contain two or more of the Primary Macro plant nutrients Nitrogen (N), Phosphorus (P) and Potassium (K) which are broadly referred to as NPK products. In South Africa NPK products are named using a numerical system e.g. 4:3:4(33) which is called the “grade” of the product. The grade of a product is also a guarantee of analysis for that specific product; the tolerance on nutrient concentration variances in a product are regulated by Act 36 of 1947. The grade 4:3:4(33) contains the primary macro nutrients in a ratio of 4 parts N : 3 parts P : 4 parts K, the sum of which totals 11 parts.The total plant food concentration is displayed in brackets, in this example 33%. The NPK concentrations can be calculated from the grade accordingly: The concentration of N: 4⁄11 X 33 = 12% The concentration of P: 3/11 X 33 = 9% The concentration of K: 4⁄11 X 33 = 12% The total nutrient concentration of NPK adds up to 33% as displayed in brackets. The other 67% of the product consists of the elements Ca, H, O, S, Cl and a few other elements which are constituents of the raw material compounds and filler material. Other Secondary Macro Nutrients such as Sulphur (S) and micro nutrients such as Zinc (Zn) may also be registered as plant food ingredients in NPK products; their concentrations are expressed as a percentage and included in the grade notation of the product, e.g.: 4:3:4(33)+0.5%Zn or 4:3:4(33) +2% S +0.5%Zn. In some SADC countries, Europe and America fertilizer grades are expressed differently, where all the numbers in the grade refer to percentages of plant nutrient however the P and K content are expressed as oxides: Total N is as % N Total P is as % P2O5 Total K is as % K20 To convert P2O5 to % P multiply by 0.4364 (conversely divide by 2.2915) To convert K2O to % K multiply by 0.8302 (conversely divide by 1.2046) For example the Zambian product with the grading 8: 24: 16 would contain elemental nutrient concentrations equating to: N: 8% P: 24 X 0.4364 = 10.47% K: 16 X 0.8302 = 13.28% Please note: Consult a qualified person (Act 36 of 1947) for specific applications / recommendations.
All figures quoted should be considered as a typical product analysis and may vary due to manufacturing process and raw materials. PHYSICAL PROPERTIES A granular crystal or fine white crystalline powder. Critical Relative Humidity: 96.3. Solubility @ 20°C: 11.1 g/100ml of water. CHEMICAL PROPERTIES Chemical formula: K2SO4. 42% Potassium (K). 17% Sulphur (S). Salt index: 46 (relative to Sodium Nitrate @ 100). AGRONOMIC BENEFITS Suitable for crops that are sensitive to chloride. Technical grade product should preferentially be used for foliar feeding and drip irrigation. Compatible for blending with Mono Ammonium Phosphate, LAN, Urea, Ammonium Sulphate, Potassium Chloride. Please note: Consult a qualified person (Act 36 of 1947) for specific applications / recommendations.
All figures quoted should be considered as a typical product analysis and may vary due to manufacturing process and raw materials. PHYSICAL PROPERTIES A generally spherical shaped granular product. Colour may vary from cream /white – yellow brown – grey. Critical Relative Humidity: 91.6. Solubility @ 20°C: 32.8 g/100ml of water (37.4, technical grade). CHEMICAL PROPERTIES Chemical formula: NH4H2PO4. 22% Phosphorus (P), technical grade 27% P. 11% Nitrogen (N), technical grade 12% N. Salt index: 26.9 (relative to Sodium Nitrate @ 100) AGRONOMIC BENEFITS Dissolves rapidly in the soil in the presence of adequate soil moisture. Pure sources are suitable for foliar feeding and drip irrigation. Compatible for blending with LAN, Urea, Ammonium Sulphate, Potassium Chloride, Potassium Sulphate, Potassium Nitrate. Please note: Consult a qualified person (Act 36 of 1947) for specific applications / recommendations.
All figures quoted should be considered as a typical product analysis and may vary due to manufacturing process and impurities. PHYSICAL PROPERTIES A fine or granular product. Colour of product may vary from white – pink – red and grey depending on minerology and impurities. Critical Relative Humidity @ 30°C: 84. Solubility at 20°C: 34.2g / 100ml water CHEMICAL PROPERTIES Chemical formula: KCl. 50% Potassium (K). 50% Chloride (Cl). Salt index: 114 (relative to Sodium Nitrate @ 100). AGRONOMIC BENEFITS & CAUTIONS 1. The cheapest and most concentrated source of K. 2. May be put through irrigation systems. 2. NPK plant mixtures that have been band placed and contain combined Nitrogen and Potassium content in excess of 75kg could cause salt burn. 5. Compatible for blending with MAP, LAN, Urea, Ammonium Sulphate. Please note: Consult a qualified person (Act 36 of 1947) for specific applications / recommendations.
All figures quoted should be considered as a typical product analysis and may vary. PHYSICAL PROPERTIES A white granular / prilled product. Particle size distribution of granular product typically ranges from 2.0 – 5.0mm. Critical Relative Humidity @ 30°C: 72.5% Solubility at 20°C: 108g / 100ml of water. CHEMICAL PROPERTIES 46% Nitrogen (N). NH2-CO-NH2 N in the Ammine (NH2) form and is not available for plant uptake. NH2 is converted to NH4+ through the urease reaction. Acidification index: 3.57 kg pure lime/kg N or 1.64 kg pure lime per kg urea applied. Salt index: 75 (relative to Sodium Nitrate @ 100). Biuret (NH2-CO-NH-CO-NH2) may be formed by polymerization at high production temperatures. AGRONOMIC BENEFITS & CAUTIONS Urea is the most widely used N source in agriculture. It is the cheapest source of N and due to its higher concentration additional savings may be made on application and logistics costs. Urea is readily soluble and may be put through irrigation systems. Urea N is not immediately available for plant uptake. NH2 must first be converted to ammonium before it can be taken up by plants. Ammonium doesn’t leach due to its positive charge. Urea in solution carries no electrical charge and is prone to leaching. Leached urea will lead to sub soil acidification and eutrophication of dams and rivers. Urea is best washed into the soil through rainfall or irrigation or incorporated to prevent volatilization losses. Application of urea to a soil surface covered with plant residue could increase volatilization due to urease in the plant residue. Avoid application of urea to recently limed soil surfaces as the alkalinity from the lime could cause volatilization. Urea is compatible for blending with Mono Ammonium Phosphate, Ammonium Nitrate and Potassium Chloride. Avoid mixing urea with nitrates or nitrate containing mixtures to prevent NPK blend quality problems. Biuret levels >1.5% may lead to toxicity especially when foliar feeding. Although feed grade urea is used in animal feeds as source of non-protein nitrogen, caution should be taken to prevent spillages and contamination with drinking water as excess urea is toxic and will cause in mortality in livestock. Please note: Consult a qualified person (Act 36 of 1947) for specific applications / recommendations.
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