Potato Research

, Volume 39, Issue 4, pp 561–569 | Cite as

The effect of physiological age and planting date on the response of potatoes to applied nitrogen and on levels of residual nitrogen post-harvest

  • Patrick A. Johnson
  • Frances Seeney
  • Diana Williams


Experiments were conducted on sandy and deep silty soils to assess the effect of physiological age of seed tubers and planting date on the response of potatoes to nitrogen fertiliser. Nitrogen optima commonly had large standard errors which made interpretation of the data difficult. On the sandy soil with cv. Record, early planting increased yield in two years but had no effect on mean N optimum (303 kg ha−1, NOpt). Mean NOpt was less on the silty soil where the cv. Pentland Squire was grown, and was reduced from 273 kg ha−1 to 241 kg ha−1 when planting was delayed by 4 weeks. Physiological age had no effect on NOpt. On the sandy soil, residual soil mineral nitrogen (RSMN) increased by 0.05 kg ha−1 per kg N fertiliser applied; on the silty soil the increase was four times as large. RSMN was larger following the late planted crop on the silty soil in one year.

Additional keywords

nitrate environment sandy soil silty soil 


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Copyright information

© Kluwer Academic Publishers 1996

Authors and Affiliations

  • Patrick A. Johnson
    • 1
  • Frances Seeney
    • 2
  • Diana Williams
    • 3
  1. 1.Arable ResearchADASBostonUK
  2. 2.Arable ResearchADASPreston WynneUK
  3. 3.Land and Environmental Research CentreADASMansfieldUK

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