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This article in AJ

  1. Vol. 70 No. 4, p. 683-685
     
    Received: Jan 22, 1976
    Published: July, 1978


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doi:10.2134/agronj1978.00021962007000040037x

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

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

Abstract

Abstract

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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