Category

Phosphate products

Triple Super Phosphate - TSP also referred to as Double Super

PROPERTIES OF TRIPLE SUPERPHOSPHATE – TSP

By | FERTILIZER PRODUCTS, Phosphate products | No Comments

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.

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Mono Ammonium Phosphate(33) - MAP(33)

PROPERTIES OF MONO AMMONIUM PHOSPHATE – MAP

By | FERTILIZER PRODUCTS, Phosphate products | No Comments

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.

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Langebaan Rock Phosphate - Langfos

THE EFFICACY OF LANGFOS – LANGEBAAN ROCK PHOSPHATE

By | Phosphate products, Phosphorus & Phosphates, PLANT & SOIL NUTRITION | No Comments

Langebaan Rock Phosphate (Langfos) is a phosphate rock (PR) of organic sedimentary origin that was widely marketed in South Africa until 1994. The original product Langfos Premium had a total phosphorus (P) concentration of 12.6% and citric P concentration of 3%, was milled and screened so that 80% of the particles passed through a 0.149mm sieve. The remainder of larger particles were used in combination with water soluble sources of superphosphate to manufacture granular NPK mixtures. In 2010 a new mine was opened and Langfos is once again available to farmers as an additional phosphate source for consideration. The total P content now ranges from 8 -10% and citric P concentration ranges from 1.8 -3.2%. 63% of the phosphate is in the tri calcium phosphate form and has a 20% calcium content as well as traces of Sulphur (S), Magnesium (Mg), Zinc (Zn), Boron (B), Copper (Cu), Molybdenum (Mo), Iron (Fe), Manganese (Mn) and Cobalt (Co). The product has a Group 2 Fertilizer registration in accordance with Act 36 of 1947. A comparison of Langfos Premium to the Langfos currently available:                                              Langfos Premium     Langfos                                              (Pre 1994)                      2010 – present Total P:                          12.6%                                8-10% Water soluble P:     0                                          0 Citric Soluble P:      3%                                      1.8-3.2% Particle size:             80% < 0.149mm          23% < 0.149mm 20% > 0.149mm           67% > 0.149mm  Langfos is not water soluble and should be considered to be a slow release fertilizer; approximately 50% of the P in Langfos becomes available for plant uptake in the first year of application, the balance over an extended period of time. From personal experience Langfos Premium has proven effective as a long term slow release source of P on acidic soils in Kwa Zulu Natal (KZN) and formed the basis of establishment of many Kikuyu pastures, sugarcane lands, avocado and citrus orchards where soil P test levels were found slowly increase despite limited or no application of superphosphate over periods spanning approximately 20 years. Thibaud et al. cite early researchers who found that the dissolution of PR is determined by gradients in the activities of phosphate, calcium, and hydrogen ions. The rate of PR decomposition is enhanced by soils with a low pH, high levels of reserve acidity and a low calcium status. PR was found to be more effective when applied to acid, well buffered soils than neutral soils and soils that had been recently limed. In addition to this soils with a large capacity to immobilize P from the soil solution generally promote more rapid and extensive dissolution of PR. Thibaud et al. (1992 & 1993) conducted research using a strongly P-fixing Balmoral clay and a weakly P-fixing Avalon sandy loam soil in greenhouse pot trails. They found that Langfos was not an effective substitute for superphosphate. It was however found that Langfos was more effective under strongly acidic conditions and that soils that retain P weakly may be more suited to fertilization with Langfos. The relative agronomic effectiveness (RAE) of Langfos compared to triple superphosphate however was 36% and 14%…

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