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Agronomy Journal Abstract -

Effects of N Fertilization and Population Rate-Spacing on Safflower Yield and other Characteristics1


This article in AJ

  1. Vol. 70 No. 4, p. 683-685
    Received: Jan 22, 1976

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  1. H. G. Nasr,
  2. N. Katkhuda and
  3. L. Tannir2



Since information on the culture of safflower in Lebanon is not yet available, field trials were conducted in 1973 and 1974 to: (a) determine the effects of N fertilization and (b) plant population spacing on safflower (Carthamus tinctorius) yields and other characteristics.

Nitrogen application at the rate of 75 kg N/ha was necessary for higher seed, oil, and protein yield when compared to the zero N. Rates of 150 kg N/ha or higher gave no additional yield increases, but significantly increased plant height and number of heads/plant. Seed weight and number of seeds/head were not affected. In 1973, when zero N was not included, differences in seed yield were not significant except for protein yield which increased with higher N rates. This was due to the significant increases in percent protein.

Increasing population rates from 133,333 to 266,667 and even to 533,333 plants/ha increased seed, oil, and protein yield and plant height. However, the number of heads/plant and number of seeds/head were reduced and seed weight, percent oil and percent protein were not affected. The 37.5 cm row spacing gave better yields than the 75 cm. Response to the 5 cm within row spacing as compared to the 10 cm was generally absent.

The interaction N by population rate-spacing was not significant. However, the combination of 75 kg N/ha and the 10 cm × 37.5 cm spacing (266,667 plants/ha) appeared to have produced the most profitable seed yield (3,410 kg/ha).

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