NxP and NxPxK interactions in relation to yield, weed cover and fungi infection in soybean

Imre Kádár, József Vörös, László Radics

Research output: Contribution to journalArticle

1 Citation (Scopus)


The experimental calcareous chernozem loamy soil had in its ploughed layer 3% humus, around 5% CaCO 3 and 20% clay and it was originally found to be poorly supplied with P and Zn, moderately well supplied with N and K. The trial involved 4N x 4P = 16 x 4K = 64 treatments with 2 replications giving a total of 128 plots. The groundwater depth was 13-15 m and the area was prone to drought. The fertilizers were applied in the form of calcium ammonium nitrate, superphosphate and potassium chloride. In the case of excessive NxP fertilisation the weed cover increased from 5 to 21%, while the soybean cover dropped from 78% to 56%. In this treatment the air-dry weed shoot mass on August 15 th was 4 times that on the control plots, reaching a value of 2.5 t ·ha -1, chiefly due to the spread of Chenopodium and Amaranthus species. The degree of infection with Macrophonia phaseolina at harvest was 100% on the withered plants growing on unfertilized soil, while this value was below 5% with maximum NxPxK nutrition, where some of the plants were still green. The late ripening induced by overnutrition was responsible for the resistance to Macrophonia, since forced physiological ripening did not occur even in a dry year.

Original languageEnglish
Pages (from-to)863-866
Number of pages4
JournalCereal Research Communications
Issue numberSUPPL. 5
Publication statusPublished - Dec 1 2008


  • Fertilization
  • Macrophonia infection
  • NxPxK interactions
  • Weed occurrence
  • Yield

ASJC Scopus subject areas

  • Physiology
  • Agronomy and Crop Science
  • Genetics

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