18 ref.; Summary (En)

To obtain more knowledge about the pattern of grain production of a winter wheat crop, the effect of plant density and time of tiller emergence on grain yield per ear were studied. At harvest, ear size and ear components were ascertained; the findings are discussed in relation with ear growth and ear development during the prefloral growing period. Detailed insight was obtained into the productivity of ear-bearing tillers and their contribution to final grain yield. Shoot productivity decreased in denser crops: ears were smaller because spikelet differentiation, grain set and grain filling were inadequate. The time that the tiller emerged largely determined its

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