Developments in Production of Granular Urea-Ammonium Phosphate Fertilizers

Meline, R. S.; Hicks, G. C.; Kelso, T. M.; Norton, Michael M.

doi:10.1021/i260025a025

Cited by 3 publications

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“…The total N contents of the SCU fertilizers ranged from 26 to 37%-Research to develop lighter coatings and slower dissolution rates of the N has continued (9). Nitric phosphate (NP, 25.7-5.5-0) and urea ammonium phosphate (UAP, 33.8-8.3-0) produced by TVA (7) were included in Experiment 4 in 1966-67.…”

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Sulfur‐Coated Urea and Uncoated Soluble Nitrogen Fertilizers for Fescue Forage¹

Mays¹,

Terman²

1969

Agronomy Journal

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Field experiments were carried out during 1965–67 to compare rates, sources and times of N topdressing for ‘Kentucky 31’ fescue (Festuca arundinacea). Uncoated ammonium nitrate (AN), urea, and other readily soluble N fertilizers resulted in higher first‐cutting yields, which were higher in content of total N. Sulfur‐coated urea (SCU) resulted in lower first‐cutting and higher later‐cutting yields than did the soluble N sources. Total annual yields were usually similar with all N sources. Mixtures of AN and SCU or split applications of AN resulted in the most uniform seasonal growth and N content. Lower yields and apparent crop recovery of N from uncoated urea and urea ammonium phosphate (UAP) indicated lower efficiency of these urea‐containing N sources for topdressing, particularly at higher N rates. December, January, February, and March topdressing dates had rather similar effects on forage yields and N contents.

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confidence: 99%

Sulfur‐Coated Urea and Uncoated Soluble Nitrogen Fertilizers for Fescue Forage¹

Mays¹,

Terman²

1969

Agronomy Journal

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“…However, eliminating the dryer from a granulation plant saves in both investment and operating costs as well as decreasing dust and fume problems. A process without a dryer is especially important in the production of mixed fertilizers containing urea or ammonium nitrate since drying is difficult and a long retention time and low-temperature air must be used (Meline et al, 1968). Only limited tests have been made with ammonium sulfate to provide supplemental nitrogen, but additional work is planned.…”

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confidence: 99%