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Abstract

 

This article in AJ

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


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doi:10.2134/agronj1958.00021962005000050001x

Long-Time Trends in Grain Yields of Five Rice Varieties1

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

Synopsis

Synopsis

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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