The Basic Technological Prerequisits for Production of Planting Material by Cuttings

1990

S. 579-588

2 Abb., 3 Tab., 33 Lit. Ang.

Unselbständiges Werk

200061884

There are three basic phases of technology of forest species propagation by cuttings: (1) preparation of mother plants; (2) rooting of cuttings; (3) acclimatization of the rooted cuttings. In the whole process of propagation a number of factors apply their influence. In the first phase (conditioning of mother plant) the nutrition is most important. In our trials with nutrition of mother plants, the cuttings from mother plants with high N content and low Ca content rooted better. The high N content in the tissue of cuttings was a characteristic phenomenon also in etiolization of mother plants. Etiolization in the studied trees positively influenced rooting and the total length of new formed roots. In some species, shaping or strong, decapitation of mother trees, were the most effective methods to influence the mother trees. Cutting collection data is the next important factor underlying the success of rooting. The calendar date of collecting is not decisive in this case. Effective technique requires exact determination of optimale cutting collection date and determination of simple practically applicable markers of maximal native rooting ability of cuttings. The main role is played by stimulation of cuttings by exogenous stimulators. In all the observed trees the higher percentage in rooting of cuttings was gained by application of stimulators. Microclimatical conditions in the propagating house are another factor contributing to the general success of rooting. There is a comparison between several propagation house types and regimes in which cuttings formed roots even at a low intensity of light. It is advisable to lower frequency of mist spraying (without losses of humidity) even under low polythene tunnel. Quality of the final plants from cuttings depends mainly on the morphological structure of cuttings and on the way of acclimatization of the rooted cuttings.