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American Journal of Potato Research

, Volume 96, Issue 1, pp 62–68 | Cite as

Field Evaluation of Potato N Needs Following Forage Legumes

  • Keith A. KellingEmail author
  • Todd W. Andraski
  • Phillip E. Speth
Article
  • 19 Downloads

Abstract

In an attempt to quantify the nitrogen (N) contribution from forage legumes to succeeding potatoes, trials were conducted on 28 Wisconsin alfalfa or red clover fields. Potato total yield and crop value were determined following in-season fertilizer N applications of 0 to 280 kg ha−1. Only 2 of the 12 alfalfa sites and 6 of the 16 red clover sites responded to applied fertilizer N when total yield was considered. However, using crop value, responses were seen at 5 alfalfa and 7 red clover sites. Apparent fertilizer replacement value ranged from 0 to 224 kg N ha−1 for both alfalfa and red clover, and averaged 129 or 102 kg N ha−1 for the respective forages. Due to the wide variation, consideration of criteria in addition to preceding crop is necessary to accurately estimate potato N needs following legume forages. Use of the petiole nitrate-N test did not improve the predictive capability.

Keywords

Legume N credit Fertilizer N replacement value Petiole nitrate-N 

Resumen

En un intento para cuantificar la contribución del nitrógeno (N) de legumbres de forraje a papas posteriores, se condujeron ensayos en 28 campos de alfalfa o trébol rojo en Wisconsin. Se determinó el rendimiento total de papa y el valor del cultivo siguiendo aplicaciones de fertilizante N en el ciclo de 0 a 280 kg ha-1. Solo dos de los 12 sitios de alfalfa y 6 de los 16 de trébol rojo respondieron a la aplicación de fertilizante N cuando se consideró el rendimiento total. No obstante, usando el valor del cultivo, se vieron respuestas en 5 sitios de alfalfa y 7 de trébol rojo. El valor aparente del reemplazo del fertilizante fluctuó de 0 a 224 kg N ha-1 tanto para alfalfa como para el trébol rojo, y promediaron 129 o 102 kg N ha-1 para ambos forrajes, respectivamente. Debido a la amplia variación, la consideración del criterio, además del cultivo precedente, es necesario estimar con precisión las necesidades de N de la papa posteriores a los forrajes. El uso de la prueba del nitrato-N del pecíolo no mejoró la capacidad predictiva.

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Copyright information

© The Potato Association of America 2018

Authors and Affiliations

  • Keith A. Kelling
    • 1
    • 2
    Email author
  • Todd W. Andraski
    • 1
    • 2
  • Phillip E. Speth
    • 1
    • 2
  1. 1.Department of Soil ScienceUniversity of Wisconsin-MadisonMadisonUSA
  2. 2.Department of Soil ScienceUniversity of Wisconsin-MadisonMadisonUSA

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