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Comparative Growth Analysis of Two Spring Wheats and One Spring Barley¹

Two cultivars of spring wheat, Triticum aestiuum L., cvs. ‘Neepawa’ and ‘Pitic 62’, and one cultivar of spring barley, Hordeum vulgare L., cv. ‘Bonanza’, were compared for grain yield and its relationship0 to patterns of leaf area development and dry matter accumulation. Each cultivar was planted at an early and a late seeding date at Saskatoon in 1980 and in 1981. Leaf area (cm²/plant) and biological yield (g/m²) were determined at weekly intervals commencing five weeks after seeding. Grain yield, components of grain yield, and final biological yield were measured at maturity. Grain yield was found to be a curvilinear function of final biological yield in Pitic 62 and Bonanza but the relationship appeared to be linear for Neepawa. Within a cultivar, higher biological yield gave higher grain yield.

Bonanza barley produced more dry matter and greater leaf area than either wheat cultivar early in the season. This advantage disappeared as the crop approached maturity. Pitic 62, although having greater maximum leaf area index and greater leaf area duration than Neepawa, tended to have a similar pattern of dry matter accumulation early in the season. Pitic 62 had greater final biological yield and grain yield by virtue of its later maturity. Yield of wheat might be increased without delaying maturity by searching for types which grow quickly under cool spring conditions.

Key Words: Harvest index • Leaf area • Triticum aestivum • Hordeum vulgare

² Senior research scientist, Crop Development Centre Univ. of Saskatchewan, Saskatoon S7N OWO, Canada, and former postdoctorate. fellow (presently research Officer, Inst. for Agric. Res., P.O. Box 2003, Addis Ababa, Ethiopia), respectively.

Received for publication December 21, 1981.

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