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Effect of Nitrogen Fertilizer on Yield, Nitrogen Content, and Yield Components of Safflower

Nitrogen fertilization produced large increases in safflower seed yield when amply irrigated, a lesser effect with moderate irrigation, and none where irrigation was severly restricted.

Total nitrogen in above ground plant portions increased with N fertilization rate, doubling from first bloom to maturity at all N rates. Percentage recovery decreased as applied N rates increased.

Nitrogen fertilization increased safflower seed yield with more heads in the tertiary position and increased weight per head in the secondary and tertiary position. Increased head weight resulted from increased weight per seed in secondary head position and increased number of seeds per head in the tertiary position.

Key Words: safflower • yield • yield components • nitrogen uptake • irrigation

² Formerly farm advisor, University of California, El Centro, California, and Professor and Soil Scientist, respectively, Department of Agricultural Chemistry and Soils, University of Arizona, Tucson. Senior author is now Associate Professor and Associate Soil Scientist, University of Idaho, Moscow.

Received for publication December 20, 1967.