The newly produced bulbs were named, after the scale of the mother bulb in whose axil they were formed, as A, B, C, and D for the fleshy scales (from inside to exterior) and H for the dry tunic. The production pattern of all types and grades was studied during three years. Especially the A and H bulbs were superior to the others in productivity. Second were B bulbs, followed by C and D. This productivity was not concerned with weight increase but to growth of the main bulb and offset number, which should not be too high.
Based on these results a selection scheme was proposed to eliminate all bulbs inferior in productivity. This scheme was the basis for tulip cultivation with selection in the meantime, so that productivity of the stock stayed maximum.
|Qualification||Doctor of Philosophy|
|Award date||2 Feb 1968|
|Place of Publication||Wageningen|
|Publication status||Published - 1968|
- ornamental bulbs