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This article in AJ

  1. Vol. 50 No. 5, p. 233-235
    Received: Aug 13, 1957

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Long-Time Trends in Grain Yields of Five Rice Varieties1

  1. C. Roy Adair,
  2. E. M. Cralley and
  3. T. H. Johnston2



The average yields of Fortuna increased each 7-year period of the 28 years. The 7-year average yields of the 4 varieties susceptible to diseases present during the period varied according to prevalence or control of specific diseases. White tip control appears to be necessary to get a maximum response from nitrogen fertilizer in susceptible varieties. Short or long term yields may be a poor basis for predicting comparable yields of rice varieties that differ in disease reaction.

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