Abstract
Abstract Grain set in spikelcts of ears was reduced in spring-sown wheat established at high sowing rate (500 viable seeds/m2) compared with wheat planted at normal rates (250 secds/m2). the reduction being greatest in spikelets positioned near the base and near the apex of the ear. Regression analysis revealed a significant and positive relationship between final grain set and spikelet dry weight at the early boot stage. Poor grain set in wheat grown at supra-optimal seeding rates was attributed to a combination of reduced carbohydrate supply Imd water stress in the young developing ear.
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