Nitrogen fertilizer efficiencies on potatoes

Westermann, Dale T. and Kleinkopf, G.E. and Porter, Lynn K. (1988) Nitrogen fertilizer efficiencies on potatoes. American Potato Journal. 65:377-386.

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Abstract

Nitrogen fertilizer efficiencies must be known to successfully apply N fertilizer according to crop growth needs. The objective of this study was to determine the recovery, partitioning, and translocation of N fertilizer applied at different times for potato production. Russet Burbank potatoes were fertilized preplant with 15N-depleted ammonium sulfate, and during early and late tuber growth with urea containing K15NO3 in 1978 or (15NH2)2CO in 1980. All N applications increased tuber yields above the control treatments. The N recovery efficiency was 60% for the preplant N application, and over 80% and near 60% for the N applications during tuber growth in 1978 and 1980, respectively. Good agreement was found between the isotope and difference methods of determining N recovery efficiencies. Labeled N was initially concentrated in the stems and leaves, particularly if applied during tuber growth. Over 80% of the assimilated, labeled nitrogen was found in the tubers at the start of plant maturation. These data indicate that a significant improvement in N fertilizer efficiency would result from split N fertilizer applications made according to crop growth needs.

Item Type: Article
NWISRL Publication Number: 0655
Subjects: Irrigated crops > Potato
Soil > Amendments > Fertilizer
Practical farm efficiency
Mass Import - autoclassified (may be erroneous)
Depositing User: Dan Stieneke
Date Deposited: 20 Nov 2010 21:53
Last Modified: 06 Jan 2017 21:08
Item ID: 501
URI: https://eprints.nwisrl.ars.usda.gov/id/eprint/501

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