Abstract
The effects of planting densities on the development and yield of tulip bulbs were studied for the cultivar ‘Lustige Witwe’ (planting size 8–9 cm, type A) in two successive growing seasons. The total number of lifted bulbs decreased with increasing density due to shrivelling of certain buds. The shrivelling started at the time of anthesis, mainly in the buds in the axils of the outermost bulb scales. At densities between 5 × 5 and 12 × 12 cm plant −1 the relative growth rate ( R w) decreased with increasing density. A difference in the R w values between the two seasons was probably partly caused by differences in the stocks used for the experiments. The highest weight increase was found at a density of 214 bulbs m −2 in 1969 and 229 bulbs m −2 in 1970.
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