It is non-flammable and non-hazardous. Rock phosphate is affordable (<$400/ton delivered) and slow release, which farmers who want to limit field passes, organic or otherwise, find valuable. Solubility enhancement of Phosphorus from rock Phosphate… 416 The other acids produced during the process are carbonic acid (H2CO3) produced from evolution of carbon dioxide (CO2) dissolved in water, nitric acid (HNO3) produced by dissolution of nitrogen (N) in moisture of the compost. Some research studies have shown the advantage of using high reactive rock phosphate such as Bayovar Rock Phosphate to increase oil palm yield. Phosphate Rock. Solubility in Water Negligible Appearance and Odor Light tan to brown pebble or powder, no odor. Phosphate solubilizing bacteria promote solubility of rock phosphate, without significant leaching of phosphorus. From: Thermodynamics, Solubility and Environmental Issues, 2007 The phosphorous is not water soluble so it will not rapidly leach away, but the collodial soft rock phosphate shows good levels of citrate solubility providing good plant available nutrients. Matiullah Khan and Muhammad Sharif. Rock phosphate provides extended release of plant available phosphorus season long and over multiple years according to research. Dissolution of rock phosphate is dependent on soil proton supply as well as calcium and phosphate concentration gradients in the […] Dissolution Soluble phosphate is an indicator of plant available phosphate in the soil (Chien and Hammond, 1978). 1) Research Shows Benefits of High Reactive Rock Phosphate. Phosphate rocks containing mixtures of carbonated hydroxyl- and fluorapatites give rise to calcium-bearing pyromorphite solid-solutions with a similar total composition of the initial phosphate rock as a result of partial or total calcium substitution by lead [15]. Section IV—Fire and Explosion Hazard Data Flash Point (Method Used) N/A Flammable Limits LEL UEL Extinguishing Media Special Fire Fighting Procedures Rock Phosphate is an inorganic material. The main factors which controlling rock phosphate solubility in soils are high pH, calcium carbonate content, clay content and soluble Ca, Al, Fe, or use of extensive amount of water as in rice fields ( Muraoka et al., 2002). Marschner (1995) pointed out that areas of … 2) High Reactive Rock Phosphate Increased Oil Palm Yield Phosphate solubility can be increased through the use of acidic agents such as elemental sulphur, humates, compost, manures or solubilizing microorganisms. That doesn't make it a myth, just as the countless other products and techniques that farmers use and gardeners don't aren't myths.

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