REJUVENATION PRUNING OF HAZELNUT CV TONDA GENTILE DELLE LANGHE
The present work deals with the vegetative and productive response of plants in which the number of trunks was reduced to 6 or 4 and these were headed back 2 m high. In particular were investigated: 1) The period needed for a complete vegetative and productive recovering; 2) the most fit number of trunks per bush in relation to the fixed space; 3) the opportunity to head at the same time all the trunks or in different years.
The best number of trunks per bush resulted to be six. Contemporaneous heading of all trunks was preferable.
The plants needed 5 years to recover the full production: that is a really short time if compared with a newly planted orchard.
The new vegetation sprouted from a height of 1 m. The branches, with the aid of the subsequent pruning were well distributed along the trunks. Consequently leaves had a more developed palisade tissue and branches had a higher number of female clusters than in the test plants.
The mean yield per plant was doubled, and the percent kernel was 1% higher than in the test plants, notwithstanding the larger production.
The rejuvenation pruning of hazelnut plants in stage of senescence can therefore be recommended, on condition that plants have not fungal diseases at the root system.