Five cultivars of wheat (Triticum aestivum L.) were evaluated for effects of weathering by subjecting windrowed grain to varying periods of exposure in a 2-yr study. Moderate amounts of precipitation caused a significant reduction (5%) in test weight affecting density and packing efficiency about equally. Cultivars differed in test weight loss with Neepawa showing the largest reduction of 2.9 and 4.2 kg hL−1 in successive years. Cultivars also differed in susceptibility to bleaching, the primary cause of grade loss. The 1000-kernel weights decreased significantly (1.4%) in only 1 yr. Grain hardness decreased approximately 8% with delayed harvest at similar rates for all cultivars. The hard-grained Glenlea and RL4137 were the most resistant to test weight loss and bleaching, indicating that selection for improvement might be possible.
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Czarnecki et al. (1986) studied this question.
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