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Barley Production as Influenced by Timing of Soil Moisture and Timing of Nitrogen Applications¹

Synopsis: Low moisture tensions during pollination increased yield and during internode elongation increased spikes per plant and kernels per spike. Compared with 60 pounds of N per acre, 240 pounds increased spikes per plant, kernels per ~pike, and yield. N applications only at planting resulted in increased kernels per spike, kernel weight and yield, but decreased spikes per plant. Later applications in conjunction with planting applications resulted in further increases of spikes per plant and kernel weight.

² Soil Scientists, USDA, Tucson, Arizona. Appreciation is expressed to R. Brumley, L. Cooper, M. Lowrey, and S. ~Mitchell for field and laboratory assistance and to R. Cypert for statistical aid. The authors are indebted to A. D. Day and D. F. McAlister for suggestions in defining the growth stages. Many questions concerning statistical procedures were resolved by H. Tucker, Arizona Agricultural Experiment Station Statistician.

Received for publication April 25, 1963.