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This article in AJ

  1. Vol. 85 No. 3, p. 651-655
     
    Received: Mar 16, 1992
    Published: May, 1993


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doi:10.2134/agronj1993.00021962008500030024x

Nitrification Inhibitor Influences on Potato

  1. H. W. Martin ,
  2. D. A. Graetz,
  3. S. J. Locascio and
  4. D. R. Hensel
  1. B iogeochem. Ecol. Div., Savannah River Ecol. Lab., Univ. of Georgia, Drawer E, Aiken, SC 29802
    S oil Science Dep., Univ. of Florida, Gainesville, FL 32611
    V egetable Crops Dep., Univ. of Florida, Gainesville, FL 32611
    U niv of Florida Agric. Res. and Ed. Center, Hastings, FL 32045-0728

Abstract

Abstract

Nitrification inhibitors may reduce loss of fertilizer N from the root zone by reducing leaching and denitrification. This reduced N loss should be reflected in increased crop yields. These studies were conducted to determine if potato yield, specific gravity, or leaf N at flowering would be increased by use of nitrification inhibitors. Nitrification inhibitors dicyandiamide (DCD) and 2-chloro-6-(trichloromethyl)- pyridine (nitrapyrin) were evaluated in five studies on potato (Solanum tuberosum L. cv. Atlantic) in Northeast Florida on an Arenic Ochraqualf, a Grossarenic Paleudult, and a Grossarenic Paleaquult. Treatments were combinations of N at 67, 134, and 202 kg ha−1; DCD at 0, 5.6, and 11.2 kg ha−1; nitrapyrin at 0.56 and 1.12 kg ha−l; and isobutylidene diurea (IBDU) applied as one-thied of the N. Tuber yields were not affected by nitrification inhibitors in four of five tests but were increased 14% in one test. Nitrification inhibitors increased leaf N concentration at flowering in three of four tests. Tuber yields were higher with DCD than with nitrapyrin in three of five tests. In several year-location combinations, use of IBDU resulted in greater tuber yield and leaf N concentration at flowering than did nitrification inhibitors. Based on these results, nitrification inhibitors can not be recommended for potato production on hyperthermic, sandy, irrigated soils.

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