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Fertilizer research

, Volume 45, Issue 3, pp 217–220 | Cite as

A modified urea based NP fertilizer: urea-TSP-MAP combinations

  • M. X. Fan
  • A. F. MacKenzie
  • H. D. Blenkhorn
Article

Abstract

Applying urea with acidic phosphate fertlizer increases urea fertilizer efficiency by reducing ammonia volatilization and toxicity to crop from urea hydrolysis. However, urea and triple superphosphate (TSP) are not recommended to be cogranulated because blends might become wet and sticky. Monoammonium phosphate (MAP) is a less acidic P source than TSP, but is compatible with urea. The objective of this study was to evaluate compound NP fertilizer products made from MAP and TSP combinations as P sources with urea. Fertilizer mixtures were pelletized from commercial urea, TSP and MAP with different N:P2O5 ratios and MAP/TSP combinations. Moisture changes during storage, pH of fertilizer solutions, and ammonia volatilization from surface applied fertilizer pellets were measured. Using MAP with TSP in urea-P mixtures reduced moisture increases during storage. Increasing MAP in urea-TSP-MAP combinations increased fertilizer solution pH by over 1 unit as the MAP/TSP-P2O5 ratio increased from 0/100 to 100/0. Adding MAP as 50% of P in urea-MAP-TSP mixtures at 3:1 and 1.5: (N:P2O5) ratios reduced ammonia loss from urea 50% to 60% compared to urea alone; and ammonia loss was similar to that of urea-TSP combinations. A urea-TSP-MAP fertilizer combination could make efficient use of urea-N by crops by reducing ammonia loss from urea hydrolysis.

Key words

ammonia volatilization monoammonium phosphate pH urea triple superphosphate 

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References

  1. Aasamae E, Arumeel E, Einard M & Veiderm M (1993) Obtaining granular NPK fertilizers from single superphosphate and urea. Fert Res 35: 161–167Google Scholar
  2. Chien S H, Christianson, CB, Lupin S & Peters E (1987) Compaction of metal salt-urea complexes with triple superphosphate. Fert Res 14: 181–191Google Scholar
  3. Fan MX & MacKenzie AF (1994) Corn yield and phosphorous uptake with banded urea and phosphate mixtures. Soil Sci Soc Am J 58: 249–255Google Scholar
  4. Fan MX & MacKenzie, AF (1995) The tocity of banded urea to corn growth and yield as influenced by triple superphosphate. Can J Soil Sci 75: 117–122Google Scholar
  5. Fan MX & MacKenzie, AF (1993) Urea and phosphate interactions in fertilizer microsites: Ammonia volatilization and pH changes. Soil Sci Soc Am J 57: 839–845Google Scholar

Copyright information

© Kluwer Academic Publishers 1996

Authors and Affiliations

  • M. X. Fan
    • 1
  • A. F. MacKenzie
    • 1
  • H. D. Blenkhorn
    • 1
  1. 1.Department of Natural Resource SciencesMacdonald Campus of McGill UniversityQuebecCanada

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