The effect of weed-free period and nitrogen on eastern black nightshade competition with english pea

Michael P. Croster, John Masiunas

Research output: Contribution to journalArticlepeer-review

Abstract

Studies establish the critical period for eastern black nightshade (nightshade) (Solanum ptycanthum Dun.) competition in pea (Pisum sativum L.) and determined the effect of N fertility on pea and nightshade growth. In 1992, pea yields were most a affected when nightshade was established at planting and remained for 4 or 6 weeks, while in 1993, competition for 6 weeks caused the greatest reduction in pea yields. In a sand culture study, pea biomass and N content were not affected by three N levels (2.1, 21, and 210 mg·L-1). Nightshade plants were five to six times larger in the highest N treatment than at lower N levels. Nitrogen content of nightshade was 0.76% at 2.1 ppm N and 3.22% at 210 ppm N. Choosing soils with low N levels or reducing the N rates used in pea may decrease nightshade interference and berry contamination of pea.

Original languageEnglish (US)
Pages (from-to)88-91
Number of pages4
JournalHortScience
Volume33
Issue number1
StatePublished - Feb 1 1998

Keywords

  • Critical weed-free period
  • Crop contamination
  • Fertility
  • Interference
  • Pisum sativum
  • Replacement series
  • Solanum ptycanthum

ASJC Scopus subject areas

  • Horticulture

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