COMPACTION OF METAL SALT UREA COMPLEXES WITH SINGLE SUPERPHOSPHATE AND THEIR EFFECTS ON RADISH PLANT | ||||
| Journal of Soil Sciences and Agricultural Engineering | ||||
| Article 8, Volume 27, Issue 7, July 2002, Page 5101-5119 PDF (2.07 MB) | ||||
| Document Type: Original Article | ||||
| DOI: 10.21608/jssae.2002.255199 | ||||
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| Author | ||||
| H.I. EI-Aila | ||||
| Plant Nutrition Dept. National Research Centre, Dokkl, Giza, Egypt | ||||
| Abstract | ||||
| A series of laboratory and greenhouse experiments were conducted to evaluate the compaction of metal salt urea with monocalcium phosphate (MCP) to prepare urea-based fertilizers that contain monocalcium phosphate and still maintain good physical properties during storage. Results revealed that minimizing the hydrated water was observed from compacted metal salt urea with MCP. However a slightly increase in the free water content for the urea + MCP; indicating the replacement of the hydrated water of MCP. H20 by the urea. Data also showed that the compacted metal salt urea with MCP resulted in a reduction of urea hydrolysis, total inorganic nitrogen and NH3 volatilization than compacted urea with MCP during the incubation periods. Results showed that the release of phosphours from different products varied depending on some physical. chemical characteristics of the materials. The reaction with MCP to form the adduct complexing metal salts with MCP increase of these variation in the releaseable-P in the soil. The addition of compacted metal salt urea with MCP at any ratio improved the characterization of metal salt urea complexes comparing with other treatments. Results also showed that the availability fraction of Fe and Mn in the treated soil with Fe(urea)s 504.MCP or Mn(urea)4504. MCP, tended to increase as compared with compacted urea + MCP. This result may be due to the formation of stable complexes with Fe and Mn. These process may creat suitable condition to maintain both fractions in available forma through increasing its solubility products. The addition of Fe(urea)6 504 or Mn(urea)4 504 without compaction with MCP the fresh and dry weight of shoot and root of radish plant were significanUy increased as compared with urea compacted with MCP. However the addition of compacted urea with MCP was a remarkable effect on root and shoot of radish plant as compared with urea alone. It was noticed that the addition of Fe (ureaj, 504 or Mn (urea), 504 enhanced the utilized of N, P, K. Fe and Mn uptake through improving the management practices of nutrient supply. Whereas the application of compacted Fe (urea)s 504 or Mn (urea)4 504 with MCP were more pronounced effect on the N, p. K, Fe and Mn uptake. Generally. the use of compacted metal salt urea complexing with MCP may offers some advantages such as, reduction in urea hydrolysis andlor NH3 volatilization. improvement of seed germination and supply of micronutrients to soils. | ||||
| Keywords | ||||
| Metal salt urea complexes; urea hydrolysis; (NH4 + N03) N free water content; NH3 volatilization; P; Fe; Mn; radish plants | ||||
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