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Varietal Diversity And Yield Variability In Chinese Rice Production

D. Widawsky, S. Rozelle
Published 1998 · Biology

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Inter-varietal diversity, broadly defined as the extent of dissimilarity among a set of varieties, is increasingly recognized as important to crop production and has commanded growing attention from research in recent years. Farmers and agricultural policymakers may have an interest in varietal diversity because no single variety can completely resist or tolerate all potential stresses, and yield reduction from a particular stress may be lower, on average, when there are more sources of stress tolerance. By providing a broader base of stress tolerance, varietal diversity may also reduce yield variability when pest infestations strike or bad weather occurs.
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