Grain set failure in warm, nontraditional wheat growing areas of Asia: The boron response
1994
Rerkasem, B. (Chiang Mai University, Chiang Mai (Thailand). Faculty of Agriculture, Agronomy Department)
Grain set failure is common and widespread in the warm, nontraditional, wheat growing areas of Asia. The problem is distinguishable from the depression of grain number and yield by two other causes: frost damage and limited grain- filling capacity. Responses to boron (B) determined by the Boron Probe Nurseries throughout the region in 1990-91 confirmed earlier findings by researchers from National Agricultural Research Systems in China, India, Nepal, and Thailand, and helped to establish B deficiency as a major cause. Management of the problem is complicated by extreme variability of the B responses in wheat. In one study, the grain set index of SW41, a Thai selection, on a low B soil at Chiang Mai without B application, ranged from 27 to 69 and always 90 with B. Large differences in sensitivity to B deficiency found among wheat genotypes suggest that selection for tolerance may be one way to overcome the problem. A simple screening method for tolerance to B deficiency in a sand culture is presented
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