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This article in AJ

  1. Vol. 72 No. 1, p. 157-160
     
    Received: Apr 30, 1979


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doi:10.2134/agronj1980.00021962007200010030x

Precautions on the Use of Anhydrous Ammonia Applicators in Research Plots1

  1. J. T. Moraghan2

Abstract

Abstract

Use of anhydrous NH3 presents certain difficulties not encountered in research involving solid fertilizers. Little information is available concerning the problem of obtaining uniformity of distribution of anhydrous NH3 among injection blades of applicators used in field-research studies. The influence of orifice size, and flow-equalizer manifold sleeves on distribution of different NH3 flows from a pressure-regulator device (John Blue Nitrolator) by a rafial manifold was investigated. The work was done with four and seven-blade applicators with blade spacings of 76 and 30.5 an, respectively, by collecting released NH3 in water. Variability in distribution was affected by choice of manifold outlet, orifice size, and NH3-flow rates. Particularly high variability was generally encountered with excessively low, <0.35 kg/ cm2, and excessively high, >3.5 kg/cm2, manifold pressures. Optimal performance for commonly used fertilizer rates was obtained with 0.635 and 0.119-cm orifices for the four and seven-blade units, respectively. Uniform spacing of manifold outlets around a radial manifold was efficacious. Some problems commonly encountered when using anhydrous NH3 in experimental work are described and discussed. Researchers using anhydrous NH3 should calibrate applicators for both total quantity of NH3 applied per unit area and uniformity of distribution among injection units.

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