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UCPNM 1.0
 

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The UCPNM (Upland Cotton Petiole Nitrogen Management) application provides interpretation for cotton petiole nitrate data. Users can enter in-season petiole nitrate-N data in ppm from just before first square up to peak bloom.  Secondly it is necessary to enter either the cotton growth stage or growing degree days since planting. The application returns information in graph form of what category the petiole nitrate data is in: deficient, optimal, or excessive.  If deficient, a Nitrogen fertilizer application recommendation is given.  The guidelines are based on Pennington and Tucker (1984), with the exception that we have lowered the deficiency line by 1000 ppm.  The application is based on long-season, irrigated, low and high elevation arid cotton areas, so it may not be applicable for shorter season and humid cotton growing regions.

Reference:

Pennington, D.A. and T.C. Tucker. 1984. “The cotton petiole: A nitrogen fertilization guide.” Report 8373. The University of Arizona. College of Agriculture.


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