Department of Agricultural Chemistry and Soil Science, Rajasthan College of Agriculture, MPUA&T, Udaipur, Rajasthan, 313001.
*Corresponding author (E-mail: sdr_ars05@rediffmail.com)
Present address: 1Soil Science Section, Agriculture Research Station, Banswara Rajasthan, 327001.
The present investigation was conducted for evaluating different types of coating materials on granulated single superphosphate i.e. gum, cow dung, karanj oil, mahua oil and gypsum. In solubility studies, seven types of coated and uncoated 1 g single superphosphate (SSP) fertilizer were placed in a test tube with 10 mL distilled water in the laboratory. For development of solubility curve, different types of coated SSP were studied at seven intervals viz. 1124, 2, 4, 6, 8, 10 and 12 days. After the required interval, mixture was filtered and P content was determined. The solubility studies clearly indicate that solubility of SSP fertilizers varied with different types of coating materials due to the conversion of slow release fertilizers. Further, solubility of all types of the coated fertilizer increased with increase in the time fro~ 1124 to 12 days. Release of phosphorus from the coated fertilizer could be described by first order chemical equation.
Coatings, single superphosphate, solubility, first order chemical equation
