Use of Long Cuttings to Reduce Propagation Time of Rose and Fruit Rootstocks and Street Trees
Difficult-to-root species and cultivars need very precise coordination of plant and culture parameters (Spethmann 1998; 2000). More than 50 factors or conditions that can be altered need to be ranked. The most important ones are effective age stage of the stock plant, sticking date, humidification method, and method of overwintering.
Factors such as substrate mixture or growth hormone have been over estimated. For example, rhododendrons have been rooted in peat but also in pure gravel; difficult-to-root oaks have been rooted in gravel, peat, peat mixtures, or perlite. The success of specific hormone concentrations or formulations varies from year to year. Many species root without any hormone, most other species could be rooted with only one or two concentrations of IBA. For many years we have used only 0.5% IBA and a 3 peat : 1 sand mix (v/v) as a substrate for all species.
The importance of cutting length has very rarely been investigated. The range is mostly 10 to
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